For 15 years, Gregory Hayt led Paloma Partners Management Co., the investment adviser to the Paloma Fund, a multi-strategy hedge fund. The company announced this year he would step down from his position and assume a newly created role at the company. As vice chairman, Hayt serves as a “close and active advisor” to the company’s new co-chief investment officer and CEO, Neil Chriss, and company founder and Chairman S. Donald Sussman, who also holds the title of co-CIO.