With an acting career that has spanned four decades, and having starred in over 75 films, Treat Williams is well aware that his first role on Broadway was an important one, but back then, the part felt like torture. “It was 1973, so (during) the first 6 months of my career, and I was understudying all the leads in Grease. And I hated it, “ Williams laughed as he sipped coffee from a local restaurant. But that role would later solidify his prominence as an actor, and get him back on the stage in a role he wholeheartedly desired. Williams…