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Douglas Mahone - HMG Principal

Douglas Mahone is an architect who has specialized in the field of building energy efficiency since 1974.  He is an acknowledged expert on energy efficiency codes and standards for buildings, and is currently leading a team of consultants in the development of upgrades for both residential and nonresidential energy codes in California .  He served as a committee member for ASHRAE in the development of the national model energy code, ASHRAE/IESNA Standard 90.1-1999. He has also written manuals and trained design professionals and utility personnel on the technical aspects of energy codes, such as California ’s Title 24 (residential and commercial), the national Model Energy Code (residential) and the ASHRAE/IESNA 90.1 Code (commercial).

Mr. Mahone has had a long history of collaborations with major energy efficiency programs evaluating their energy efficiency programs. He is currently leading an innovative, nationally respected consultant team to provide high level evaluation assistance to NYSERDA’s Energy $mart portfolio program.  He is also the Nonresidential New Construction (NRNC) Program Area Manager for statewide market assessment and evaluation studies in California . Mr. Mahone has consulted extensively in energy efficiency program design and implementation.  He took the lead in facilitating development of the California NRNC efficient buildings program, Savings By Design. For the Northwest Energy Efficiency Alliance (NEEA), he assisted the Board in developing a long-term strategic plan for the new construction sector and for long-term energy code support. 

As Principal and President of the Heschong Mahone Group Inc., Mr. Mahone manages a diverse and growing multidisciplinary staff with training in architecture, engineering and economics.  He provides direction and training for project managers and technical staff on a wide range of projects for some of the leading energy efficiency organizations in the nation.

In addition to his private practice, Mr. Mahone was the Founding Executive Director of the non-profit New Buildings Institute.  Previously, he taught building science and energy subjects at the MIT School of Architecture as an Assistant Professor.  Mr. Mahone received his B.Sc. and Master of Architecture degrees at the Massachusetts Institute of Technology.  He is a licensed architect, registered in Massachusetts and California .  

To contact Doug, email him at