(b Ottawa, 16 Jul. 1928)
Canadian-US dancer, teacher, and director. She studied with G. Osborn, C. and D. Littlefield, at the School of American Ballet, and later with Preobrajenska. She danced with American Concert Ballet (1943–4), then with Ballet International (1944–5), Ballet Russe de Monte Carlo (1945–9), and with Petit's Ballets de Paris, and Metropolitan Ballet, England (1949–50). In 1950 she became principal with New York City Ballet, where, as a dancer of exceptional speed, clarity, and power, she created roles in many Balanchine works, including La Valse (1951), Caracole and Scotch Symphony (both 1952), Western Symphony and Ivesiana (both 1954), Divertimento no. 15 (1956), Square Dance (1957), and Raymonda Variations (1961), also Robbins's Quartet (1954). She left in 1965 to become director of Harkness Ballet School (until 1967). She then taught for various companies and was director of American Ballet Theatre School (1977–82), until becoming artistic director of Pittsburgh Ballet Theater in 1982 where she remained until 1997, bringing works by Balanchine into the repertory.