7
January/February 2025
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THE DAVEY BULLETIN
Jim Zwack
has been promoted to
vice president and general
manager, Environmental
Consulting services, Davey
Resource Group, and
Wetland Studies and
Solutions, Inc., a Davey
company. He joined Davey
in 2010 as the director of
technical services, Davey
Institute. In 2017, he was
promoted to general manager, Davey Institute, and in
2019 he was promoted to his most recent role as vice
president and general manager, Davey Institute. Zwack
holds a master's degree in tree physiology from Iowa
State University and a bachelor's degree in urban forestry
from the University of Minnesota.
Geoff Cowan
has been promoted to
vice president and general
manager, Residential/
Commercial (R/C) services,
Western Operations. He
joined Davey in 1983 as
a tree care trainee, West
Cleveland office. After
serving in a number of
roles in various offices, he
was promoted to market
manager, North Central Chicago-area R/C services
operations in 2014 and then was promoted to operations
manager in 2017. He most recently served as the vice
president of North Central Operations, R/C services, a
role he was promoted to in 2021. Cowan is a 1987 Davey
Institute of Tree Sciences graduate, a past President's
Council member, and a three-time recipient of Davey's
Outstanding Manager award.
Dan Herms
has been promoted to
vice president and general
manager, Davey Institute.
He joined Davey in 2018 in
his most recent role as vice
president of research and
development, Davey
Institute. Herms holds a
Ph.D. in entomology with
specializations in ecology
and evolutionary biology
from Michigan State University and bachelor's degrees
in landscape horticulture and entomology from The Ohio
State University.
Thea Sears
has been promoted to senior
vice president and controller.
She joined Davey in 1993,
and her responsibilities have
included roles in financial
reporting, managerial
reporting, and operations
accounting. In 2010, Sears
was named assistant
controller and was later
promoted to corporate con-
troller in 2016. Most recently, she was promoted to
the position of vice president and controller in 2018. Sears
holds a bachelor's degree in industrial management from
the University of Akron and is a certified public accountant.
Sears is a past member of President's Council.
