Our Staff

Through our professional affiliations and continual training we have developed a team that is very knowledgeable in tree care, which sets us apart from most other tree care services.

Jesse Ziemienski - President (Board Certified Master Arborist: # WI-0145B)

President of American Tree Experts since 1989, Jesse has been with this company for over 30 years and is the second President following its founder, Chester Ziemienski. Jesse received his Bachelors Degree in Conservation from the University of Wisconsin Milwaukee in 1976 and has also received two Associate Degrees from the Milwaukee Area Technical College in Environmental Health Technology and General Education. Jesse attained his arborist certification in 1987 and was among the first arborists within Wisconsin to receive this qualification.

Due to years of experience and dedication, Jesse is one of a handful of people in Wisconsin to achieve the highest ranking qualification from ISA, Board Certified Master Arborist. Jesse has served as President of the Wisconsin Arborist Association during the 2003-2004 term and has served on the WAA Board of Directors for eight years.

Dean Ziemienski - Vice President (Certified Arborist: # WI-0644A)

Dean received his Bachelors Degree in Urban Forestry and Business Administration from the University of Wisconsin Stevens Point in 2005. Throughout his term at Stevens Point, Dean was an active member of the Student Society of Arboriculture where he served two years as treasurer. Dean is member of ISA and WAA and is also a Certified Arborist and Pesticide Applicator. His roll includes management of operations and educating clients in tree care matters.