Mark McCall

Managing Director

Mark McCall is a Managing Director of the Lime Rock New Energy team with responsibility for deal sourcing, execution, and overall fund management. He currently serves on the board of directors of Qmerit. Mark was appointed by President Obama to serve as the Executive Director of the Loan Programs Office at the U.S. Department of Energy from 2015 to 2017. In that capacity, he reported directly to the Secretary of Energy and was responsible for a $30 billion portfolio of existing clean energy technology investments, as well as originating new loans for four loan programs designed to support the commercialization of innovative technologies that reduce greenhouse gas emissions in the automotive, renewables, nuclear, and hydrocarbons industries. Mark joined Lime Rock Partners at its inception in 1998 and served as the firm’s first Chief Financial Officer (17 years) and General Counsel (12 years). He also served as a member of the Lime Rock Partners Investment Committee for 13 years. Prior to joining Lime Rock, Mark worked at Delus Corporation, Lehman Brothers, and E-II Holdings in positions in finance and international business.

Mark and his wife Marianna, through their family foundation, launched Trust for Learning, a high-impact non-profit focused on equitably expanding access to high quality early learning opportunities in underserved communities. Based in Westport, Connecticut, Mark previously served on the board of directors of SmartSynch, Inc., Nexcom Telecommunications, and Noble Rochford Drilling. He is a graduate of Georgetown University (B.A.) and Yale Law School (J.D.).