Joe Marren has departed from independent investment bank Sagent Advisors, where he was a Managing Director since 2005, peHUB has learned. He has joined a firm called K Stone Partners, where he is the President and CEO, his former employer told peHUB. No information regarding the objective of K Stone Partners was available. Prior to joining Sagent, Marren was the Global Head of M&A Business Development at Citigroup.