In conjunction with the release of Kate Welling & Mario Gabelli's book "Merger Masters" According to Sources continues it's interview series this week with Westchester Capital Management. Michael Shannon and Roy Behren have worked in tandem at WCM for over 25 years. We discussed portfolio structure, how they gain an edge over other merger-arb funds, and hit on some current situations including Aspen Insurance (AHL) and the breakup of United Technologies (UTX)