Laurence R. Costello
, Ph.D., Environmental Horticulture Advisor, University of California
Cooperative Extension, San Francisco, California, United States
Dr. Larry Costello is an
Environmental Horticulture Advisor with the University of California
Cooperative Extension. Located in the
San Francisco Bay Area, he has conducted an education and applied-research
program in urban forestry and landscape horticulture since 1981. He received a doctorate in Plant Physiology
from the University of California (Berkeley, California) and a master's degree
in Horticulture from the University of California, Davis. Dr. Costello is a member of the Western
Chapter of ISA and received the L.C. Chadwick Award for Arboricultural Research
in 2002. Recent publications include Oaks
in the Urban Landscape (2011), Abiotic
Disorders of Landscape Plants: A Diagnostic Guide (2003), and Reducing Infrastructure Damage by Tree
Roots: A Compendium of Strategies (2003). He is the owner of the Oracle Oak
Nursery near San Francisco, and is the founder of the California Tree Failure Reporting
Program.
E. Thomas Smiley
, Ph.D.,Plant Pathologist/Soil Scientist, Bartlett Tree Research
Lab, Charlotte, North Carolina, United States
Dr.
Tom Smiley is an
arboricultural researcher at the Bartlett Tree Research Laboratory in
Charlotte, North Carolina, and an adjunct professor of urban forestry at
Clemson University. He received an M.S. in plant pathology from Colorado State
University and his doctorate in urban forestry from Michigan State University.