He wrote for radio, television, film and stage, and was president of Writers Guild of America from 1963 to 1965.
The 1962 comedy That Touch of Mink, which he co-wrote with Stanley Shapiro, won the Writers Guild of America Award win for Best Written American Comedy,[1] and was nominated for an Academy Award.
[5] He wrote a Broadway play in 1964, Something More!, which was based on the 1962 novel Portofino P.T.A., by Gerald Green.
[6] Working with Harry Winkler, Monaster also wrote the 1969 television film Three's a Crowd, which starred Larry Hagman, Jessica Walter and E. J.
[7] Monaster died of heart failure at the Cedars-Sinai Hospital in Los Angeles, California, at the age of 78.