Weinstein is best known for his collaborations with composer William Bolcom, including the operas "McTeague", based on the novel by Frank Norris, "A View from the Bridge" based on the play by Arthur Miller, and "A Wedding", based on the film by Robert Altman. Bolcom described his work with Weinstein as a "true collaboration", and said about him that "He had such a gift for writing words that were singable, and that gave character. He was more influential on a lot of other people than people have taken into account."