Born in Brooklyn in 1968 to antique-collector parents, Bittar started early — selling vintage jewelry on St. Mark's as a teenager, then buying his first Lucite in 1990 and teaching himself to hand-carve it. Dawn Mello of Bergdorf Goodman discovered his work in 1992, and Saks, the Museum of Modern Art and Harrods followed; in 1998 he designed Burberry's first ready-to-wear jewelry collection.
He was named CFDA Accessory Designer of the Year in 2010 and Brand of the Year by the Accessories Council in 2014. After stepping away in 2015, Bittar reacquired his eponymous brand from Brooks Brothers in 2021 and expanded it into handbags and home décor. His pieces have been worn by Beyoncé, Michelle Obama, Lady Gaga, Iris Apfel, Cher and Madonna.