 Gus Alexander, a partner at the firm, best remembers him for achieving partnership in only six years and then retiring on full pension only six years after that at the age of 37.In 1967, Trustman wrote his first screenplay, "The Thomas Crown Affair".His law office overlooked the First National Bank of Boston, where he had worked during the summer of 1954, and his knowledge of the bank procedures led to the movie about a millionaire businessman who commits a perfect crime, a robbery by five men who do not know each other and never meet until the robbery, in which each has a separate role.