Randy Mastro has a long record of both city and federal public service. From 1994 to 1998, he served as deputy mayor for operations and chief of staff to the mayor of New York City. During that time, he helped tackle organized crime and helped shepherd through the nation's most sweeping protections for same-sex partnerships, efforts referred to as a "legacy" achievement.

When he departed City Hall, the Daily News praised him for doing "the seemingly impossible," noting "his contributions to the city he served so well will last a lifetime;" the New York Post lauded his "tireless and dynamic" service and "general good sense;" and The New York Times quoted a colleague describing him as "the administration's conscience."  

From 1985 to 1989, Mastro served as assistant U.S. attorney and deputy chief of the Civil Division in the U.S. Attorney's Office for the Southern District of New York, where he specialized in organized crime cases. During that time, he led the landmark racketeering suit against the International Brotherhood of Teamsters and received the highest recognitions by the U.S. Department of Justice for that work, including the Attorney General's Distinguished Service Award and the John Marshall Award for Outstanding Legal Achievement. 

Mastro is one of the nation's most respected lawyers. He also has an extensive record of litigating cases on a pro bono basis, including successfully advocating for the families of fallen 9/11 firefighter heroes that were entitled to millions in donations, fighting for racial justice, protecting civil rights and academic freedoms, and helping to reopen houses of worship that were closed during the COVID-19 pandemic.

From 2016 until earlier this year, Mastro served as chair of the Citizens Union, New York's revered, non-partisan "good government" group, focused on holding local government accountable and empowering all New Yorkers. He previously served as former vice chair of The Legal Aid Society and as a former board member of The City University of New York, the YMCA, Sanctuary for Families, the Children's Museum of Manhattan, Hale House, and the University of Pennsylvania Carey Law School.  

Mastro has also taught as an adjunct professor at the University of Pennsylvania Law School and at Fordham Law School. He has authored and co-authored articles in the Fordham Law Review, the Federal Communications Law Journal, the University of Michigan Journal of Law Reform, and the Seton Hall Law Review, among others. He has a Bachelor of Arts Degree from Yale University and received his Juris Doctorate from the University of Pennsylvania.