Mark Ein

Mark Ein
Ein at the 2025 DC Open
Born	Mark David Ein (1964-12-31) December 31, 1964 Chevy Chase, Maryland, U.S.
Education	University of Pennsylvania (BS) Harvard University (MBA)
Occupations	Venture capitalist sports entrepreneur
Organizations	Federal City Council World Economic Forum Gridiron Club President's Export Council
Title	Owner Washington Kastles (WTT) Washington City Paper CEO Venturehouse Group Capitol Investment DC Open Limited partner Washington Commanders (NFL)
Board member of	Kastle Systems United States Tennis Association (USTA)
Spouse	Sally Stiebel (m. 2013)
Awards	Key to D.C. Mid-Atlantic Tennis Hall of Fame Outstanding Public Service in Professional Sports Washington Business Hall of Fame

Mark David Ein (born December 31, 1964) is an American venture capitalist and sports entrepreneur. He is a limited partner of the National Football League (NFL) team Washington Commanders and is an investment partner in the English football club Leeds United and the Major League Baseball (MLB) team Baltimore Orioles. Ein founded the World TeamTennis (WTT) team Washington Kastles in 2008 and has chaired the DC Open tournament since 2019. He also owns the Washington City Paper, serves as chairman of the President's Export Council, and is a member of the Federal City Council, World Economic Forum, and Gridiron Club.