Mary Anne Gilmartin is founder and CEO of MAG Partners, a New York-based real estate development company she started in 2020. Prior to founding MAG Partners, she was CEO of L&L MAG in a two-year partnership with L&L Holding.

Before that, Gilmartin served as President and CEO of  Forest City Ratner, a New York real estate development company. At Forest City Ratner she oversaw the controversial 22-acre Atlantic Yards (now Pacific Park) development project in Brooklyn that includes the sports stadium and entertainment venue known as Barclays Center. Additionally, she headed up efforts in the development of the new New York Times Building and the New York by Gehry residential skyscraper (8 Spruce Street). She managed the commercial portfolio at MetroTech, the 11-building, 6.7 million-square-foot office complex and Forest City Ratners first major development project in Brooklyn. Gilmartin succeeded Bruce Ratner as CEO at Forest City Ratner in 2013.

She is a graduate of Fordham University.