Tatiana Martins, who oversaw the investigation of Michael Cohen as chief of the public corruption unit at the U.S. attorney’s office in Manhattan, has left the office to rejoin Davis Polk & Wardwell as a partner.

Martins, 41, previously had two stints at Davis Polk as an associate, broken up by travel and volunteer work. After her last time at Davis Polk, she joined the U.S. Attorney’s Office for the Southern District of New York in 2012 and served in several units, including general crimes, narcotics and public corruption. She became chief of the public corruption unit last summer.