Mark Ein is the Co-Chairman and Principal Shareholder of Kastle Systems, LLC as well as the CEO and Founder of Venturehouse Group, LLC. In addition, he is the Owner and Founder of the Washington Kastles, DC's World TeamTennis franchise. Mr. Ein is deeply involved with philanthropic works in DC and has served, and continues to serve, on different committees around the District. He is currently dating Sally Stiebel.
[Last updated on September 14, 2012]