Brian Sestak, the head of natural gas trading at New York-based commodity trading firm Hartree Partners, has joined hedge fund Citadel as a portfolio manager in Greenwich, Connecticut.
Prior to joining Citadel in October, Sestak spent less than two years at Hartree Partners, formerly known as Hess Energy Trading Company. He joined Hartree from Morgan Stanley in the second quarter of 2015. During his time at Morgan Stanley, Sestak worked as a natural gas trader and executive director. He joined