Skip to main content

Team

Get to know our team of expert arborists and support staff
President & Board Certified Master Arborist

Jesse Ziemienski

A Board Certified Master Arborist (WI-0145B), Jesse has served as president of American Tree Experts since 1989. He has a bachelor’s degree in Conservation from the University of Wisconsin-Milwaukee, and two associate degrees in Environmental Health Technology and General Education from Milwaukee Area Technical College (MATC). In 1987, Jesse became an ISA Certified Arborist making him one of the first in Wisconsin to receive this distinction.
Vice President & Certified Arborist

Dean Ziemienski

As vice-president since 2007, Dean’s responsibilities include managing daily operations and educating clients on tree care matters. He has a bachelor’s degree in Urban Forestry and Business Administration from the University of Wisconsin-Stevens Point. Dean is an ISA Certified Arborist (WI-0644A), a Certified Tree Care Safety Professional and a Certified Pesticide Applicator.
Arborist Sales Consultant

Jason Riemer

As an Arborist Sales Consultant, Jason offers solutions to residential and commercial customers throughout the Southeast Wisconsin. From 2013 to 2016, he was a member of our arborist production crew, first dragging brush, then becoming a crew leader and ultimately an ISA Certified Arborist (WI-1132A). Jason earned a bachelor’s degree in Environmental Science from Carroll University, and a master’s degree in Urban Forestry from UW-Stevens Point with an emphasis in emerald ash borer management plans.