Kamran Abdollahi, Ph.D.

Urban Forestry and Natural Resources, Southern University and A&M College, Southern University Agricultural Research and Extension Center

Kamran K. Abdollahi, Ph.D., is a national fellow of the Society of American Foresters (SAF) and professor and program leader for the Urban Forestry and Natural Resources at Southern University in Baton Rouge, Louisiana.

Kamran was instrumental in establishing the first urban forestry bachelor of science degree-granting program in the nation, which is now under the SAF accreditation. He led the program to achieve master of science and Ph.D. degree-granting status and provided leadership for establishing the first Urban Forestry and Natural Resources Department in the nation. He has been serving as an advisor to the U.S. Secretary of Agriculture on the National Urban Forestry Advisory Council (NUCFAC). Kamran served for 10 years as an executive board member of the National Association of University Forestry and Natural Resources Programs, served as president of the Arboriculture Research and Education Academy of the International Society of Arboriculture (ISA), and was an editorial board member for the Journal of Arboriculture and Urban Forestry. He received a Certificate of Achievement from Oxford University in England for his contribution to the Climate Change Roundtable. Kamran has provided leadership in urban forestry for SAF by serving as chair-elect and chair for more than six years. He has served as co-director for the Gulf Coast Regional Climate Change Assessment Program and co-edited several books on the subject.

Kamran’s research activities focus on the contribution to air, water, and soil quality by urban forest tree species. He has directed more than 20 research projects and has published and presented more than 100 scientific papers. Currently, Kamran is leading the bioenergy and biochar research at Southern University. He has an agricultural engineering degree from Pennsylvania State University, an M.S. in soil sciences, and Ph.D. in forest ecophysiology from the Arthur Temple College of Forestry at S.F. Austin State University. In addition, he has been trained as an urban forester through the University of Florida Urban Forestry Institute, the ISA, Davey Tree Institute, and the Arbor Master, Inc. Kamran has received numerous awards at the local, state, national, and international levels for excellence in teaching, research, and service.

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Adrianne L. Baumgartner, J.D.

Porteous, Hainkel & Johnson, LLP

Adrianne Landry Baumgartner has been a member of the firm since 1978, with a litigation practice in the areas of personal injury and insurance defense. She has tried numerous judge and jury trials representing many personal lines and commercial carriers along with their insureds in automobile and premise liability cases. Over the years, her practice has also focused on the defense of insurance companies in bad faith/extra contractual cases. She has lectured as well as appeared on many panels over the years for various clients and organizations on a variety of subjects involving personal injury, coverage, and litigation tactics. Initially practicing in the New Orleans office, she opened the firm’s Covington office in 1982 and is currently the managing partner.

Adrianne has been a member of numerous bar organizations, including the Covington, New Orleans, and Louisiana State Bar Associations. She serves on the Nominating Committee as well as the Legislation Committee for the Louisiana State Bar Association. She has served as a hearing officer for the Louisiana Disciplinary Board and is presently serving as a probation officer and fee dispute arbitrator. She has been active with the Louisiana Association of Defense Counsel and served as its president from 2004–2005. She is a member of the Association of Defense Trial Attorneys, serving on the executive board from 2002–2005. She is also active in the Defense Research Institute. She currently serves on the board of directors for the Louisiana Association of Business and Industry and previously served on its executive council. In 2011, she was inducted into the American College of Trial Lawyers. She is a member of the West St. Tammany Chamber of Commerce and serves on the board of directors of Support Our War Heroes.

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Denice Britton, RCA #296


Denice Britton has been a successful consultant for more than 35 years, specializing in tree management programs, appraisal, and risk assessment. She is currently president of California Tree and Landscape Consulting, Inc., known as CalTLC, a consulting firm serving northern California.

She was co-owner of Britton Tree Services from 1984 to 2001 and was the urban forest manager for the city of Chico, California, from 2006 to 2013. Denice was instrumental in establishing the certification program for arborists in the Western Chapter ISA. She was subsequently elected president of the chapter in 1990 and also served as president of ASCA.

Denice has a bachelor’s degree in plant pathology and a master’s degree in urban forestry from UC Berkeley.

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David Callow

Urban Forest and Ecology, City of Melbourne, Australia

David Callow leads the multi-disciplinary Urban Forest and Ecology team at the city of Melbourne. The Urban Forest and Ecology team is responsible for implementing the world-recognized Urban Forest Strategy and the recently released Nature in the City Strategy.

Prior to joining the city of Melbourne, David was employed as a Consulting Arborist. He has worked in the broader discipline of landscape horticulture for two decades, with experience also in utility arboriculture and landscape construction. David has qualifications within the fields of horticulture, arboriculture, and natural resource management. He is passionate about creating healthy and diverse landscapes through ecosystem driven climate adaptation, community participation, and strategic thinking.

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Jeremy Chancey, RCA #646

Jeremy Chancey loves trees. As an International Society of Arboriculture Certified Arborist, he spends his days trying to protect, value, and honor them. Jeremy has been in the tree business for 30 years, having owned and run several successful arboriculture related businesses in South Florida and Brazil. He has also obtained his Tree Risk Assessment Qualification (TRAQ) and his Tree and Plant Appraisal Qualification (TPAQ) and is a Registered Consulting Arborist, the premier level of membership with the American Society of Consulting Arborists.

Jeremy is currently the secretary/treasurer on the board of ASCA and in the past, served on the board of directors of ISA and as vice president of both Landscape Inspectors of Florida and the Brazilian Urban Forestry Council. Jeremy has an encyclopedic knowledge of tree species in South Florida and Brazil and loves to share his information and enthusiasm with everyone.

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Yan Chen, Ph.D.

Professor in Ornamental Horticulture, Louisiana State University AgCenter, Hammond Research Station

Dr. Yan Chen is a professor in Ornamental Horticulture at the LSU AgCenter, Hammond Research Station. Dr. Chen received her B.S. and M.S. degrees from China Agriculture University and her Ph.D. in horticulture and a Graduate Certificate in entomology from Kansas State University. Dr. Chen has provided research and extension services to the green industry in Louisiana since 2005, and her research interests have been focused on IPM and interactions between plants and insect pests, as well as the use of plant growth regulators in production and landscape management. A new endeavor Dr. Chen has taken on is to evaluate the viability of commercial tea production in Louisiana.

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Scott Cullen, RCA #348

Scott Cullen is a Registered Consulting Arborist, an ISA Certified Arborist, a Connecticut Licensed Arborist, and a New Jersey Licensed Tree Expert, and is TRAQ and TPAQ qualified. He has been involved in various phases of arboriculture since 1971. Scott earned a master’s degree in real estate development and investment at New York University. He has lectured and published interntionally on tree appraisal. Scott served on ISA’s Plant Appraisal & Valuation Committee and reviewed the Guide for Plant Appraisal, 10th Edition in its various drafts.

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Rodrigo Diaz, Ph.D.

Department of Entomology, Louisiana State University

Dr. Rodrigo Diaz is an assistant professor in the Department of Entomology at Louisiana State University. He obtained his B.S. degree in agriculture from Zamorano University in Honduras, his master’s degree from Texas A&M University, and his Ph.D. from the University of Florida. Dr. Diaz’s research focuses on biological control of non-native weeds and insects. Current projects include biological control of crape myrtle bark scale, giant salvinia, emerald ash borer, roseau cane scale, and air potato.

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Hallie Dozier, Ph.D.

LSU AgCenter, School of Renewable Natural Resources

Dr. Hallie Dozier has a bachelor of arts degree in foreign languages from Centenary College, a master of science degree in extension education from Louisiana State University¬–Baton Rouge, and a Ph.D. in forest ecology from the University of Florida. After she graduated from Centenary College, Hallie served in the U.S. Peace Corps for three years in central Africa. This experience changed her career path drastically from a focus on liberal arts to biological sciences (plant biology and forestry).

Hallie is currently an associate professor in the LSU School of Renewable Natural Resources (RNR) and an extension specialist with the LSU AgCenter. Her faculty position in RNR includes teaching courses in basic ecology, human dimension of resource management, and educational outreach methods.

She has served as the coordinator for the Louisiana Arborist Continuing Education Program since 2002, offering state licensed arborists across Louisiana education in tree care methods, safety, and professionalism. Her passions are for all things trees and for people who grow and steward trees and forests. She is an avid painter and bicycling enthusiast.

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Deni Elliott, D.Ed.

University of South Florida

Deni Elliott is the Eleanor Poynter Jamison Professor of Media Ethics and Press Policy at the University of South Florida. She served as campus Ombuds from 2004–2017 and chair of the Journalism and Digital Communication Department from 2013–2019.

Prior academic appointments include Mansfield Professor of Ethics and Public Affairs (1992–1996), University Professor of Ethics (1996–2004), Professor of Philosophy (1992–2004) and Founding Director, Practical Ethics Center (1996–2004) at the University of Montana; Director, Ethics Institute (1988–1992), Adjunct Associate Professor, Department of Philosophy (1988–1992), and Associate Research Professor, Department of Education (1988–1992) at Dartmouth College. Deni’s first tenure-track appointment was at Utah State University. She became a full professor and was awarded her first endowed chair eight years after completing her graduate degree.

Deni’s publications span the disciplines of practical ethics. She is the author of more than 200 articles and book chapters for the scholarly, trade, and lay press. From February 2003–June 2006, she co-hosted Ethically Speaking, a weekly two-minute radio show syndicated through PRX.

Deni holds a B.A. in communication from the University of Maryland, an M.A. in philosophy from Wayne State University, and an interdisciplinary Ed.D. in philosophy of education from Harvard University, with work at the Kennedy School of Government, Department of Philosophy, and Harvard Law School, in addition to the Graduate School of Education.

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Fred Fellner, Ph.D.

Louisiana State University

Bio coming soon.

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Stefania Gasperini


Stefania Gasperini, agronomist and arborist, is the owner of AR.ES. since 1996, an Italian company qualified in arboriculture and urban forestry for municipalities and private owners. Gasperini is specialized in tree risk and tree stability assessment and in management of veteran trees. She is a speaker at many conferences and workshops, a board member of SIA (Società Italiana di Arboricoltura), first vice-chairwoman of European Arboriculture Council, board member of SAG Baumstatik e.V., and member of ISA. She is an ISA Certified Arborist and TRAQ qualified. With Giovanni Morelli, Stefania worked for many years with Pierre Raimbault, and she now is one of the leaders of Progetto 400, inspired by Francis Hallé, a project that will be studying trees for the next 400 years.

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Donald H. Godi, FASLA, PLA, RCA #444, TRAQ

Donald H. Godi & Associates, Inc.

Don Godi is a licensed landscape architect and Registered Consulting Arborist practicing nationwide from a base in Golden, Colorado. Major practice emphasis has been refined in the areas of litigation support for site design/construction and tree damage concerns. He has participated in dozens of litigations, many involving criminal tree damage and a significant number of tree injury and death cases.

Don has a BSAg (Hort.) from the University of Missouri and an MLA from the University of Illinois and has taken numerous short courses and workshops. Between higher education periods he served as a 1st Lieutenant in the USAF (SAC) as a vehicle maintenance officer and assistant squadron commander at Fairchild AFB near Spokane, Washington.

Early career efforts were as a licensed landscape architect with an award-winning practice specializing in comprehensive landscape and site design with construction management services. Over the past two decades his career has transitioned into one as a Consulting Arborist, with clients primarily in the Rocky Mountains and the Great Plains, but also extending cost-to-coast from Washington to Connecticut. His training as a landscape architect has given him the expertise to produce reports emphasizing attention to detail, clarity, logic, and extensive landscape knowledge.

Don’s activities as a volunteer have earned him praise as a “get things done” individual with leadership qualities and keen foresight. Over the decades he has originated and led programs such as the ASLA Jane Silverstein Reis Award, the Contractor/Supplier of the Year Award, the Dick Marshall Memorial Pheasant Hunt, Featured Professional Honor, Business Bootcamp, Front Range Tree Recommendation Committee, and the ISA Regional Plant Guide.

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Judge John W. Green


Judge John Green received his B.S. in finance and his J.D. from Louisiana State University He served as clerk for the First Circuit Court of Appeal for two years and was elected judge for Division D of the 22nd Judicial District Court in St. Tammany and Washington Parishes and served from 1976 to 1997.

Judge Green served on the Executive Committee of the Louisiana District Judges Association, on the faculty for the Louisiana Association of Defense Counsel trial advocacy seminars, and on the faculty for LSU Law Center trial advocacy courses. He was selected for Who's Who in American Law. He founded the Youth Service Bureau serving St. Tammany and Washington Parishes youth and families in need of services and served as its board chairman and various other positions. Judge Green was appointed to the Louisiana State Board of Ethics in 2001 for a five-year term by Governor Mike Foster and was reappointed in 2006 for an additional five-year term by Governor Kathleen Blanco, serving until 2008. He served on the Louisiana State University Law School Board of Trustees, St. Paul's School Board, and the St. Tammany Parish Hospital Foundation Board. He served on the Judicial Campaign Oversight Committee by appointment from the Louisiana Supreme Court and was selected by the Louisiana Bar Foundation as 2014 State of Louisiana Distinguished Jurist. Judge Green was employed by the Louisiana State Board of Medical Examiners as a judge from 2007 until 2015.

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Malcolm Guidry, Ph.D.

Consulting Arborist

Bio coming soon.

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David Hunter, RCA #408

David D. Hunter, Certified Arborist LLC

David D. Hunter is a Registered Consulting Arborist with ASCA, a USFS Trained Tree Risk Assessor, and an ISA Certified Arborist, and is Tree Risk Assessor Qualified and a Professional Plant Appraiser and Professional Forester. David has been called upon to testify in court and has helped clients reach resolution prior to trial. His services include expert witness in arboriculture and forestry, professional plant appraisals of landscapes, trees and timber trespass, tree forensics as to why a tree or tree part failed causing injury or death, tree health and hazard/ risk assessments, and insurance claims relating to damage done to tree or people/property damaged by trees. David has over 40 years of experience working in forestry and the arboriculture field. He has been a consultant and expert in these fields for over 24 years.

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Daniel Illg

Audubon Nature Institute

Daniel Illg is the chief arborist at Audubon Nature Institute. A Louisiana native, he started working with Audubon in 2004 as a horticulturist and soon became an arborist at Audubon Zoo. With 20 years of experience as a horticulturist and arborist, Mr. Illg oversees the tree care at all 10 Audubon properties, focusing on the health care of the trees at Audubon Zoo and Audubon Park.

A state licensed arborist, Mr. Illg prioritizes the long-term health of the trees. During his 15-year tenure with Audubon Nature Institute, he has been a strong advocate for protecting the historic live oaks and ensuring that they are available for future generations of New Orleanians.

In his free time Mr. Illg enjoys kayaking the local waterways and photographing nature.

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Katie J. Krebs

Consulting Arborist

Katie Krebs is a second-generation arborist with a lifetime of varied arboricultural experience. Thanks to her father, she was exposed to and integrated into the field at a very young age. After she graduated from U.C. Davis with a B.A. in nature and culture with an emphasis in arboriculture, she worked with large tree maintenance companies for several years selling tree work and managing accounts. In 2017, she started her own business as a full-time, independent Consulting Arborist. She currently works with engineers, architects, developers, other consultants, tree companies, HOAs, residents, and a variety of clientele. The majority of her work includes tree surveys, tree preservation plans, construction monitoring, and tree management plans, but she also assists with species selection, tree diagnoses, and tree risk assessments. Katie is an ISA Certified Arborist and is ISA Tree Risk Assessment qualified; she recently joined the ASCA membership and RCA community.

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Ashley Long, Ph.D.

Louisiana State University (LSU) School of Renewable Natural Resource

Dr. Ashley Long serves as LSU’s wildlife extension specialist. As faculty at LSU, she teaches wildlife habitat management, studies how vegetation management and human activity influence species’ distributions and wildlife population dynamics, and provides outreach on practical applications of wildlife research to people across the state.

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Giovanni Morelli

Progetto Verde

Giovanni Morelli, agronomist and arborist, owner of Progetto Verde since 1994, is a consultant in arboriculture and urban forestry and specializes in tree risk and tree stability assessment and management of veteran trees. He has written numerous articles,is a university lecturer, and has been a speaker at about 100 national and international conferences. Giovanni is a member of the International Society of Arboriculture (ISA), the Società Italiana di Arboricoltura (SIA), and SAG Baumstatik e.V. He is an ISA Certified Arborist, an ETT (European Tree Technician), a Board Certified Master Arborist (ISA), and TRAQ (Tree Risk Assessment Qualification) Qualified.

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Mark Porter

Consulting Arborist

Mark Porter began his tree care career in 1976. He also served in the Navy as a Hospital Corpsman, where he learned the lab, X-Ray, and diagnostic skills he still uses today. Mark’s tree care experience includes private, utility, municipal, and commercial tree care. He has over 25 years of consulting experience. Clients include businesses, homeowners, developers, HOAs, insurance companies, cities and state agencies, law firms, public schools, local universities, conservation districts, botanical gardens, and fellow arborists.

Mark became certified as a tree care worker and arborist in 1989. Since the 1990s,he has assisted with testing of certified tree workers and has judged several tree climbing championships. Mark believes the most valuable training is achieved by participating in the tree failure database programs and our favorite, tree appraisal training.

Mark served the Western Chapter ISA (WCISA) as commercial arborist committee chair. In 1992, as legislative chair of the WCISA, Mark wrote educational tree pruning legislation—California Government Code 53067. During the same time, Mark represented the WCISA to the contractor’s license board when the licensing of arborists in California began. While president of the Inland Urban Forest Council, Mark and colleagues secured Cal Fire funding, hired Photosphere Research, and developed an Urban Forest Master Plan Took Kit, now used by several California cities and also the University of California Riverside.

Mark attended Riverside and Citrus Community Colleges, completed online classes at Berkley School of Music and Duke University, has recertified as an arborist 10 times, and graduated the ASCA Consulting Academy in 2007.

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Lindsey Purcell

Purdue University, Department of Forestry and Natural Resources

Lindsey Purcell, urban forestry specialist and instructor in the Forestry and Natural Resources Department at Purdue University, has been involved in the community landscape and urban forestry industry for over 30 years. As an ISA Board Certified Master Arborist, he has served Indiana communities as a landscape and tree professional in municipal and private enterprise. His educational background includes an A.S. degree from Vincennes University, a B.S. degree from Purdue University, and a M.Ed. degree from Indiana State University. Lindsey serves as executive director of the Indiana Arborist Association in addition to acting as lead extension administrator for Purdue. Lindsey is an ASCA Registered Consulting Arborist, holds the ISA Tree Risk Assessment Qualification, and is a certified instructor by the ISA.

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Yadong Qi, Ph.D.

Southern University

Dr. Yadong Qi is a professor of urban forestry and the Head of the Department of Urban Forestry and Natural Resources and Graduate Program Director in College of Agricultural, Family and Consumer Sciences at Southern University, Baton Rouge, LA. Dr. Qi has over 30 years of teaching, research, and outreach experiences in urban forestry. Her research focuses on urban forest ecology and tree growth and development. Dr. Qi has served as PD/Co-PD for research projects over $7 million and published more than 100 scientific research papers. She was the 2017 Morrison-Evans Outstanding Scientist Award winner, 2014 Southern University System Researcher of the Year, and 2007 Southern University’s Teacher of the Year.

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Henrik Sjöman

Swedish University of Agricultural Science & Gothenburg Botanical Garden

Henrik Sjöman´s work is mainly focused on developing knowledge of site-adapted plant use for urban environments. How the capacity of different trees will vary in context to its urban environment and in delivering ecosystem services has become the prime driver in Henrik’s work and, as such, how to extend the knowledge of diversifying the urban treescape.

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Lisa Smith, RCA #464

The Tree Resource

Lisa Smith is an ASCA Registered Consulting Arborist and owner of The Tree Resource, a Southern California tree-consulting firm providing all aspects of tree management and preservation. She began 25 years ago, working for one of the nation’s largest tree contractors, providing arboricultural programs for projects throughout Southern California, working in many arenas of the tree industry, including installation, large-scale maintenance, IPM (Integrated Pest Management), pruning guidelines, and risk management as a Board Certified Master Arborist and Qualified Tree Risk Assessor.

Lisa enjoys providing educational opportunities for industry professionals and affiliate green groups, including teaching for the UCLA Extension Landscape Architecture program. As past president of the Western Chapter of ISA, Lisa also remains active on the board.

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Joris G.W.F. Voeten

Urban Roofscapes

Based on his M.Sc. in tropical forestry from Wageningen University, Joris G.W.F. Voeten uses plant growth to create livable, sustainable, and healthy green cities for people. As a Consulting Arborist for 20 years, he focused on tree growing site constructions and ecosystem functionality of trees in urban areas. With knowledge of soils and substrates, his field of activity moved to vegetated roof systems product innovation, which shifted to rainwater harvesting and irrigation challenges to achieve better plant growth. With the effect of global climate change visible in water challenges in cities, his work now focuses on integrated urban (rain) water management on all levels of the city, from productive blue-green roof systems to valuable and healthy tree growth in the streets. With the incorporation of sustainable and multifunctional trees in streetscapes, the aim is to bring the circular ecosystem approach to urban development, effectively reducing the urban heat island effect, mitigating urban floods, and improving human health and urban livability.

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Whitney Wallace

Area Forest Agent, LSU AgCenter

Whitney Wallace is a regional forestry specialist for the LSU AgCenter, where she helps assess regional forestry needs, develops programs, and fosters relationships by working with landowners, loggers, consultants, and residents of southeast Louisiana. Whitney obtained a bachelor of science degree in forest management from LSU in 2001 and is currently working on her master’s degree. Presently, Whitney serves on the Louisiana Conservation Education Steering Committee and is a board member of the Tangipahoa Parish Forestry Association, St. Helena Parish Forestry Association, and Louisiana Forestry Association.

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Matthew Wells, M.Sc., MICFor

City of Santa Monica, Public Works, Public Landscape Division

Matthew Wells is the public landscape manager for the city of Santa Monica in California. Santa Monica strives to be a beacon of local government, including its sustainably planned urban forestry program. Previous to this, he was the director of tree preservation for NYC Parks and has also been an arboricultural officer in central London. Matthew has a unique international experience of urban forestry and specializes in municipal tree care. He is a Chartered Arboriculturist and holds a master’s degree in arboriculture and urban forestry. Matthew has presented at conferences globally and is passionate about research driven resource management.

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Torrey Young, RCA #282

Dryad, LLC

Torrey Young has worked in arboriculture since 1972 and has been an ASCA member since 1987. He has served ASCA in many roles, including 11 years on the board of directors and as president in 2005. Torrey is currently serving ASCA as an advisor to the Nominations and Elections Task Force. He was also the first graduate of the inaugural ASCA Consulting Academy in 1995.

Torrey ran a tree care and consulting firm, TREESCAPES, Inc., for 27 years before merging with a national firm. He is now a full-time independent Consulting Arborist through his firm, Dryad, LLC, formed in 2004. Torrey is an ASCA Registered Consulting Arborist, an ISA Board Certified Master Arborist and Municipal Specialist, and a CaUFC Certified Urban Forester and is ISA Tree Risk Assessment Qualified and a CA Licensed Contractor (Landscaping and Tree Service).

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