''For details of the dart player, Mark Walsh, please see Mark Walsh (Dart player)

Mark Walsh is an entrepreneur, venture capitalist, and political activist. Walsh is the managing partner of Ruxton Ventures, LLC, a private equity and investment firm he founded in early 2001. He is also a senior executive fellow at the University of Maryland's Dingman Center for Entrepreneurship. His former jobs include CEO of VerticalNet, America Online executive, and president of GEnie.

He is active in liberal politics; he was a founder and the former CEO of Air America Radio and an advisor to the Democratic National Committee.

He graduated from Union College in 1976 and is now a trustee of that college. He got his MBA from Harvard Business School in 1980. His first job was as a news anchor for a CBS affiliate in West Virginia.