 After the 1950s Patrick worked mainly as a performer in operas, making appearances at the Dallas Opera, the De Nederlandse Opera, the Grand Théâtre de Genève, the Houston Grand Opera, the Lyric Opera of Chicago, the Metropolitan Opera, the Opéra national du Rhin, the San Francisco Opera, the Vienna Volksoper, and the Welsh National Opera among other major opera houses.In 1968 he starred as Private Don Hanwell in the world premiere of Hugo Weisgall's "Nine Rivers from Jordan" at the New York City Opera.He was particularly active with the Seattle Opera where he notably created the role of George Milton in the world premiere of Carlisle Floyd's "Of Mice and Men" in 1970.