Who Are We?

About Sherrilyn

Sherrilyn Billger, PhD is a member in good standing of the International Society of Arboriculture and ISA Certified Arborist PD-2708A with Tree Risk Assessment Qualification. Billger received the ISA Penn-Del Chapter Award of Merit in 2020 for “outstanding meritorious service in advancing the principles, ideals, and practice of arboriculture.”


Dr. Billger holds a PhD in Economics, specializing in econometrics and labor economics. She spent 13 years in academia, earning tenure and serving in administration, before devoting her work life to plant and ecosystem health.

Dr Billger climbing an oak