Who We Are

Mark McCall is a Managing Director of Lime Rock with oversight responsibility for the operational and administrative functions of both Lime Rock Partners and Lime Rock Resources, including accounting, tax, legal, compliance, human resources, and IT.  Mark joined Lime Rock at its inception in 1998 and served as the firm’s first Chief Financial Officer (17 years) and General Counsel (12 years).  From July 2015 to January 2017, Mark took leave from Lime Rock to accept a Presidential appointment, serving as the Executive Director of the Loan Programs Office at the U.S. Department of Energy.  In that capacity, Mark 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 from four loan programs designed to support the commercialization of innovative technologies spanning the nuclear, fossil, renewables, and automotive industries.  

Prior to joining Lime Rock, Mark worked at Delus Corporation, Lehman Brothers, and E-II Holdings in positions in finance and international business.  Based in Westport, Connecticut, Mark previously served on the board of directors of Deer Creek Energy, Nexcom Telecommunications, Noble Rochford Drilling, and SmartSynch.  He is a graduate of Georgetown University (B.A.) and Yale Law School (J.D.).  

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