The upper echelons of one of Goldman Sachs' most prestigious businesses, its investment banking division, are about to undergo a big leadership transition. Gregg Lemkau, co-head of the firm's investment banking division since 2017 and a member of Goldman's management committee, is departing the firm at the end of 2020. He will be succeeded by Jim Esposito, Goldman's global co-head of its global markets division, who will step into Lemkau's role on Jan. 1.