Born in New York City, he was the son of English-born theatrical producer Henry Miller and Bijou Heron, a former child actress.

Raised and educated in Europe, he returned home to follow in his father's footsteps and became a highly successful Broadway producer.

Miller served as director of the League of New York Theatres as well as an officer of the Actors Fund.

Nominated three times, Gilbert Miller won the Tony Award for Best Play in 1950 for his production of The Cocktail Party.

In 1965, he was given a Special Tony Award "for having produced 88 plays and musicals and for his perseverance which has helped to keep New York and theatre alive."