Ryan's first supporting cast television role was as Aggie Thompson in the first several episodes of The Doris Day Show.
Shortly after his death, Day discovered Melcher had committed her to a CBS situation comedy, The Doris Day Show, without consulting her, and that not only had he lost the millions she had earned throughout their marriage because of poor investments, but he had left her seriously in debt as well.
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Kopell made memorable recurring appearances as KAOS agent Siegfried in Get Smart, Alan-a-Dale in When Things Were Rotten, Jerry Bauman in That Girl and Louie Pallucci in The Doris Day Show.
Despite their presence, and that above the title of bestselling author Harold Robbins, since the characters were from his novel of the same name, the program was a ratings fiasco, losing badly to Mayberry R.F.D. and The Doris Day Show on CBS and The NBC Monday Movie on NBC.
His last appearance was on The Doris Day Show in 1969, after which he left show business and became the head of Revlon's Paris office.
After The Doris Day Show, Gerritsen had guest-star or cameo appearances in several television shows including The Odd Couple, Bonanza, The Courtship of Eddie's Father, The Virginian and Family Affair.