A Milwaukee native, Brennan is a high-powered prosecutor in the nation’s largest city. The first woman to serve as New York City's Special Narcotics Prosecutor, Brennan’s office handles an average of 3,000 indictments a year, conducts investigations into national and international drug trafficking organizations, and participates in large-scale police department operations targeting specific areas of New York City. Brennan received her law degree from the University of Wisconsin in 1983, and was hired as an assistant district attorney by legendary Manhattan District Attorney Robert Morgenthau. Her caseload eventually included murders, robberies, and sex crimes. She has been Special Narcotics Prosecutor since 1998.