Walter Dominguez, who worked on Harry O, said in a 2013 interview about David Janssen: "He was a sweet, sweet man. I was an apprentice. I was an assistant director trainee. When they reassigned me, after being on his show for a while, they reassigned me to another show, he stopped everything, he had a little party, he gave me a gold pen and pencil set with my name inscribed on it. He just couldn't have been a nicer person."