Arun Majumdar sits on the Advisory Board of Lime Rock New Energy, a “new energy” private equity firm. The chair of Lime Rock New Energy’s advisory board is none other than Ernest Moniz, who joined the board in 2019. Furthermore, Mark McCall, currently a Managing Director of Lime Rock New Energy, temporarily left Lime Rock to serve under Moniz as the Executive Director of the DOE’s Loan Programs Office from 2015 to 2017.
All this means that McCall, Moniz, and Majumdar all joined or re-joined Lime Rock in some capacity after leaving their roles with the Moniz-era DOE - in effect, a joint revolving door journey from the Energy Department into the same energy-focused private equity firm.