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Marcus B. Sheffer is an energy/environmental consultant with almost 30 years of green building experience. His company, Energy Opportunities, Inc. (EO) provides technical consulting services on projects relating to energy management, efficiency and conservation; renewable energy systems, and the environmental impacts of human enterprises. EO also operates the York County Community Foundation Energy Program providing technical and financial assistance to local nonprofit organizations. Marcus is also a partner in 7group, a multi-disciplinary team of professionals focused on integrative design and regenerative development. He is an accredited LEED Project Reviewer since 2003.

Volunteer activities have included leadership positions with the USGBC (current member of the LEED Market Advisory Committee, previously served on the LEED Steering Committee, LEED Technical Committee and as Chair of the Energy & Atmosphere Technical Advisory Group) and the Green Building Association of Central PA (Founding Board Chair). Prior to forming Energy Opportunities in 1993, he was employed by the Pennsylvania Energy Office. Sheffer earned a Bachelor of Arts degree in Environmental Studies in 1981 and a Master of Science degree in Public Administration in 1986, both from Shippensburg University. He lives with his wife of 28 years on a small farm in Pennsylvania raising sheep, hay and daughters.