Diversity in experience + knowledge.

People are at the center of our success. Our team brings decades of combined development, engineering, utility, finance and construction experience to every project. We value the diverse experience and knowledge that each team member brings to deliver innovation solutions and top-notch execution.

Our Leadership

Wayne Marshall, PE
Chief Executive Officer

Wayne Marshall serves as the chief executive officer of Petra Energy Holdings, as well as managing director at Barnabas Investment Group, and was formerly a principal at Petra Engineering, PLLC. Mr. Marshall’s responsibilities include providing strategic leadership and managing the firms’ overall operations and resources.


Julian Erfurth
Chief Operating Officer

As Board Member and Chief Operating Officer, Julian Erfurth leads project implementation and organizes the business processes of hep Petra. Mr. Erfurth was previously active for Siemens Energy in Europe, Asia, and the Americas, where he held senior management roles in project finance, strategy, and business development.


Tim Holder, MBA
SVP, Development

As SVP of development, Mr. Holder’s efforts are focused on the growth and development strategies for hep Petra.  As a former EnergyUnited electrical cooperative executive, Mr. Holder’s background covers two decades in the electric utility and energy industry with emphasis on strategic planning, emerging technology, economic development, marketing, sales, communications, governmental affairs, renewable energy and customer service.  Mr. Holder earned a master’s in business administration with a concentration in energy from the University of North Carolina at Charlotte and a bachelor’s degree in economics and political science from the University of North Carolina at Chapel Hill.

Jason Sparks, PE
SVP, Construction

As SVP of construction, Mr. Sparks is responsible for completing mission-critical projects on schedule and within budget. He brings extensive knowledge of the construction industry through over a decade of experience working for one of the largest General Contractors in the country. Mr. Sparks has managed over $300 million in construction projects, with responsibilities including project leadership, negotiating subcontracts, financial forecasting and management, estimating and business model development. He earned his bachelor of science in civil engineering from the University of North Carolina at Charlotte. Mr. Sparks is the president elect for the Professional Engineers of North Carolina and is also LEED BD+C certified.

Jeremy Turner
SVP, Operations

As SVP of operations, Mr. Turner brings expansive knowledge of steel racking for utility-scale and commercial solar projects, as well as experience utilizing raw materials and innovative design to enhance supply chain and product development. As the director of engineering at DCE Solar, he managed all research and development efforts to create industry-leading racking products and take DCE from inception to a multi-million dollar company. Mr. Turner received his bachelor’s and master’s degrees in mechanical engineering from the University of North Carolina at Charlotte.

Interested in joining our team?