Screenwriter
Mankiewicz began to write, finishing an original screenplay, Please, about the last ninety minutes in the life of a suicidal young actress. It was optioned at times by three different studios, never made, but served as an example of his talent and was responsible for his first writing assignment, an episode of Bob Hope Presents the Chrysler Theatre, directed by Stuart Rosenberg. He received a credit as "Thomas F. Mankiewicz", but thought it looked so pretentious on the screen he became Tom Mankiewicz for the rest of his career.
Mankiewicz later recalled:
There was something terribly frightening about writing a screenplay when you have the last name of Mankiewicz. You say to yourself, 'Oh, sh*t, no matter what I write, it sure ain't any All About Eve, is it?' It takes a long time to get over that. When I first came out here, everybody said, 'Give my regards to your old man, will you, and by the way, if there's anything I can do for you ___ ' On the one hand, all of that is very nice and tremendously advantageous. On the other hand, it sort of robs you of any sense of achievement. It's a real double-edged sword. And it wasn't until I had been asked back several times and, as awful as it sounds, for a lot of money, that I could finally convince myself that these people really want me because they think that I'm the best person to write the script.
In 1967, Mankiewicz joined forces with a friend, Jack Haley Jr. to come up with a musical television special tailored for the then hugely popular Nancy Sinatra: Movin' with Nancy, co-starring Frank Sinatra, Dean Martin, Sammy Davis Jr. and Lee Hazlewood. Mankiewicz was the sole writer and Haley won the Emmy for directing. This was followed by The Beat of the Brass, starring Herb Alpert and the Tijuana Brass in 1968.
Simultaneously, 20th Century Fox had optioned his original screenplay and after reading it, producer Joe Pasternak hired him to write The Sweet Ride about the California surfing community, starring Tony Franciosa, Bob Denver, and introducing Jacqueline Bisset.
The combination of that screenplay and the TV specials led Broadway producer Fred Coe to ask Mankiewicz to write the book for Georgy, the musical version of the film Georgy Girl. It opened at the Winter Garden Theatre in 1970, was nominated for three Tony Awards, but closed after four performances.