Although there is not much written about him in the Los Angeles Times of the day, he was a working actor, mostly playing small parts as gangster types and hoods.
After playing an uncredited part as a man in the movie The Silencers (1966) starring Dean Martin and Stella Stevens, with Victor Buono, Renella had an uncredited small part in Riot on Sunset Strip (1967) starring Aldo Ray. He then played the role as Claude Sadi in Dayton's Devils (1968) starring Rory Calhoun, Leslie Nielsen, and Lainie Kazan.
His guest spots on TV include Route 66, Combat!, Planet of the Apes (TV series), Mannix, The High Chaparral, McCloud, The Rockford Files, The Streets of San Francisco, Hunter, The Dukes of Hazzard, and the soap opera General Hospital.
One year when he attended the Academy Awards, he went over to Ginger Rogers at a party afterward and asked her to dance. She said yes, but told him to come back over when they played something slower, which he did.
Renella played the manager of the inn in the sci fi horror drama Moonchild (1974) starring Victor Buono and John Carradine, and he played Duke in Run for the Roses (1977) starring Panchito Gomez and Vera Miles.
Pat Renella lives in Los Angeles.