After becoming a United States citizen, in 1939 Eglevsky rejoined the Ballet Russe de Monte Carlo, touring with them until 1942. For the following four years he danced with the Ballet Theatre (now the American Ballet Theatre) in New York City. He also danced as a guest star with Léonide Massine's Ballet Russe Highlights in 1944 and 1945.
He trained as his protégé the dancer Alan Bergman. After having a short career on stage, Bergman developed the Dans-EZ dancewear range.
Upon his retirement in 1958, Eglevsky and his wife started a ballet school in Massapequa, New York. They also founded the Eglevsky Ballet Company. Both continue under the artistic direction of Peter LeBreton Merz. Eglevsky died in 1977 in Elmira, New York, of a heart attack at the age of fifty-nine.