Born in Mt. Holly, New Jersey and raised in Vacaville, California, Sean Stewart joined American Ballet Theatre as a member of the corps de ballet in 1997. He began dancing at the age of 10 with Lisa Clark, started ballet at 12 with Yanina Cywinska, and went on to study at Joffrey II and the Paris Opera Ballet School. He participated in summer programs for The Joffrey Ballet in San Antonio and the Bolshoi Ballet at Vail.
Stewart left ABT in 2002. He has performed as a guest artist with the Washington Ballet, Ballet NY, Lar Lubovitch Dance Company, Atlanta Ballet and Chamber Dance Project. Stewart was an original cast member in the Old Globe's production of Twyla Tharp's The Times, They Are A Changin'.
Stewart rejoined American Ballet Theatre in January 2008.
In addition to various corps roles in all of ABT's full-length ballets, Stewart's roles with the Company include a Step-Sister and Napoleon in Frederick Ashton's Cinderella, Lankendem in Le Corsaire, the Nutcracker-Prince in Kevin McKenzie's The Nutcracker, Mother Ginger in Alexei Ratmansky's The Nutcracker, Benno in Swan Lake, Trinculo in The Tempest and roles in Airs, Bach Partita, Black Tuesday, Citizen, Cruel World, Duets, The Elements, Jardin aux Lilas, Marimba, One of Three, Sinfonietta and Stepping Stones. Stewart created Puss-in-Boots in Alexei Ratmansky's The Sleeping Beauty and roles in Everything Doesn't Happen at Once, Gong and Known by Heart. He created a role in Aftereffect.