Jeff Kay, the director of the mayor's Office of Operations, announced on Tuesday that he will leave his position.
Kay joined the mayor's office in 2006, and oversaw many city operations, such as improving city agency operations, disseminating data to the public, and heading PlaNYC 2030.
In Bloomberg's third term, a handful of top cabinet members have left. Recently, former Homeless Service Commissioner Robert Hess stepped down and a former Deputy Mayor Ed Skyler left to join CitiGroup several weeks ago.
Two weeks ago, Bloomberg appointed former Indianapolis Mayor Stephen Goldsmith as deputy mayor. Bloomberg said that Kay was a major behind-the-scenes player in his administration.
Kay will leave City Hall to join Muss Development, a real estate developer.