Mark co-founded Airtight Energy Consulting, Inc. in 2023 and has nearly 25 years experience working to make buildings more energy efficient, including 17 years at the Center for EcoTechnology (CET). He holds certifications as a HERS Rater, Certified Passive House Consultant (CPHC), Passive House Rater and Verifier, LEED AP Homes, and LEED Green Rater. Mark holds a B.S. in Aerospace Engineering from Penn State University, and has a minor in Engineering Leadership Development.