“Although Mr. Bigelow performed as a dancer from 1946 through the 1960s, he was also known as a versatile aide-de-camp to both Lincoln Kirstein and Balanchine, City Ballet’s founders. He became an assistant to Balanchine in 1949 while still a dancer, was a production assistant from 1951 to 1977 and had the title of manager from 1978 to 1987.”