Fashion designer and founder of the Zac Posen clothing brand. he received the Council of Fashion Designers of America's 2004 Swarovski's Perry Ellis Award for Womenswear.
He interned for Nicole Miller as a sophomore at Saint Ann's School.
Ashley Olsen interned for him while attending New York University.
In his mid-teens, he became a student at New York's Parsons-The New School for Design.
He lived with partner Christopher Niquet for many years.