Clifford Chance

Energy Regulatory and Markets

Mark C. Williams is a partner in Washington, DC. on Clifford Chance's Energy Regulatory and Markets team. He has experience advising investors and energy companies on corporate, financial, securities and related regulatory matters before the US Federal Energy Regulatory Commission (FERC) and state utility commissions. Mark advises private equity fund managers, generating companies, lenders, sovereign investors and project developers, both on transactions and as portfolio counsel.

Admitted Attorney-at-Law in New York 1992

Admitted Attorney-at-Law in Washington, DC 1999

Joined Clifford Chance US LLP 2025

Member, American Bar Association

Commissioner, City Industrial Development and Revenue Bond Authority, City of Alexandria, VA (Term 2002–2020; Chairman, 2012–2020)

Trustee, Foundation of the Energy Law Journal (2011–2014)

Energy Bar Association: Vice Chair (2008–2010) and Chair (2010–2011) Committee on Professional Development and Ethics; Vice Chair, Chair-elect, and Chair, Committee on Finance and Transactions (2005–2007); Co-chair, Programs and Meetings Committee (2005–2006); Conference Chair, National Legislative Program (2005); Elected Member, Board of Directors (2002–2005); Founding Chair, Committee on Finance and Transactions (1999–2000); Chair, Committee on FERC Administration and Reorganization (1998–1999

Adviser to US Congress, House of Representatives, Subcommittee on Regulatory Reform and Paperwork Reduction (105th Congress) in connection with national electric-sector oversight hearings (1998)

Columbia University (BA), 1987

New York Law School (JD), 1990