John J. Mueller is an American police officer and administrator who serves as the Chief of the Metropolitan Transportation Authority Police Department in New York City. He previously was the 22nd Commissioner of the Yonkers Police Department. Early life and education Mueller was born in Yonkers, New York. He graduated from John Jay College of Criminal Justice in New York City. He later attended the Police Executive Research Forum, the United States Naval Postgraduate School's Center for Defense and Homeland Security, and is a graduate of the FBI National Academy. Career Mueller began his law enforcement career in 1992 with the NYPD, joining Yonkers PD in 1994 as an officer in the 4th Precinct. Over the years, Mueller advanced through the ranks, eventually earning the position of Police Commissioner in 2019. In June 2022 he was appointed Chief of the Metropolitan Transportation Authority Police Department. References Living people Year of birth missing (living people)