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Company Bio
Wayne Marshall, PE
Petra Engineering
Wayne Marshall has led Petra since its inception in 2003. Wayne has more than 25 years experience in the energy and utility industry, serving in various roles within Duke Power, Duke Energy, DukeSolutions, and Ameresco prior to founding Petra. He has managed and executed energy conservation, cogeneration, power generation, environmental conservation, and supply management for industrial, commercial, and institutional clients. He has been closely involved in the development, design, procurement, construction, financing, and operational aspects of the business. Mr. Marshall has a distinguished career managing the development, negotiation, and implementation of numerous successful projects with Fortune 500 companies and governmental entities. Mr. Marshall’s broad-based energy engineering and management experience in both retrofit improvements and energy conscious design has seen him involved in over $250 million of energy and environmental projects. Projects range from long-term supply management, cogeneration, standby generation, renewable energy, power quality and power reliability systems, HVAC, steam systems, lighting, compressed air, and motor drive conversions.
Mr. Marshall has been in various leadership roles. He has led and overseen corporate wide technical teams, corporate business development, and national environmental technology boards. He has also served on the Senior Leadership team of a large church.
Mr. Marshall is a Registered Professional Engineer in multiple states. He has served on and chaired national energy conservation, environmental conservation, and management advisory boards. Mr. Marshall was named Young Engineer of the Year for North Carolina in 1995.
George Irwin, PE
Director of Engineering
Petra Engineering
George Irwin has been Director of Engineering with Petra since early 2007. Prior to joining Petra, Mr. Irwin has over 30 years of energy and facilities engineering experience. He has development, design, procurement, construction, and management experience in the following areas: industrial plant engineering, power generation including cogeneration, central boiler and chiller plants and campus-wide utility system improvements, renewable technology applications and implementation, and utility energy conservation programs. George has applied his range of industrial and utility experience in the Energy Services industry, implementing energy cost saving programs and projects for many large and small commercial, industrial, institutional, and military facilities around the country, particularly in the Northeast and Southeast. 
Previously Mr. Irwin has held numerous engineering positions in energy services and industrial companies. George has extensive experience in utility rate analyses, energy conservation, and early renewable energy programs, having worked with Progress Energy, Central Maine Power, Massachusetts Electric, Boston Edison, Jersey Central Power and Light, PSE&G, Duke Energy, Alabama Power and many other utilities in providing demand-side services and implementing energy and environmental efficiency projects in their customers’ facilities. 
Mr. Irwin is an active member in a number of professional associations, including ASME and ASHRAE. He has a BSE, Mechanical Engineering (1976) from Duke University. He is a Registered Professional Engineer in the states of North Carolina, SC, VA, AL, MS and KY.


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