Mylan Denerstein, a litigation partner and co-partner-in-charge of Gibson, Dunn & Crutcher, has been appointed to serve as an independent monitor overseeing reforms at the New York City Police Department, a Manhattan federal judge said on Friday.

Denerstein, who previously served as an assistant U.S. attorney and deputy chief of the criminal division in the Southern District of New York, will succeed Peter Zimroth, the city’s former corporation counsel, who was appointed to the role after a federal judge ruled in 2013 that the NYPD’s use of stop-and-frisk violated the constitutional rights of nonwhite New Yorkers.