Simpson Thacher & Bartlett, already making hay with former government attorneys, has added a former longtime assistant U.S. attorney for the Southern District of New York to its roster.

Martin Bell will be joining the firm in its New York office July 26, the firm said Tuesday. It’s the latest in a series of SDNY prosecutors going into private practice, and the latest addition to former prosecutor ranks at Simpson Thacher. Simpson added former acting director of the SEC’s enforcement division, Marc Berger, in April, who also previously worked in the U.S. Attorney’s Office for the Southern District of New York.