Phone: 817-832-3224


Don has worked in the GSHP industry since 1991 and has been involved in the design and implementation of over 90,000 tons (284 MW) of installed capacity in North America. Penn was a contributor to the Certified Geothermal Inspector Course that has been adopted by the International Ground Source Heat Pump Association (IGSHPA) and was a member of the Technical Committee to develop the Bi-National CSA/ANSI C448 Standard for the Design and Installation of Ground Source Heat Pumps (GSHP) for Commercial and Residential Buildings. Don is a founding member of the GreyEdge Group.

Areas of Expertise

Functional, economic and technical feasibility of GSHP systems in residential, multifamily and commercial applications and working with building design teams with a “whole-building” approach to ensure the long-term viability of the system. This expertise has created opportunities in:

Notable Projects & Achievements

Professional Affiliations and Publications

Recent Expert Witness Engagements