Gerard traveled to
New York City, where he studied drama by day and drove a
taxicab at night. Gerard picked up a fare who showed a lively interest in the problems of unknown, unemployed actors. Before he left the cab, he told Gerard to report in a few days to the set of
Love Story, which was being filmed on location in New York. When Gerard arrived on the
Love Story set, he was hired as an extra. Later that day, he was singled out for a "bit" part, but he was not included in the finished film. During the next few years, he did most of his acting in
television commercials, almost 400, including a stint as spokesman for the
Ford Motor Company. After small roles in the gay-themed film
Some of My Best Friends Are... (1971), and the thriller
Man on a Swing (1974), Gerard gained a prominent role in the daytime soap opera
The Doctors for two years. Gerard formed his own production company in partnership with a writer-producer, co-authored a screenplay called
Hooch (1977) and filmed it as a starring vehicle for himself. With
Hooch completed, he traveled to
California to co-star with
Yvette Mimieux in
Ransom for Alice! (1977) and to play
Lee Grant's youthful lover in
Universal's ''
Airport '77 (1977). He appeared in a 1977 episode of Hawaii Five-O ("The Ninth Step") as Marty Cobb, a former cop and recovering alcoholic. A guest appearance in Little House on the Prairie impressed producer-star Michael Landon, who cast him in the leading role in the 1978 TV movie Killing Stone''. Gerard then landed his best-known role, as Captain
William "Buck" Rogers in the TV series
Buck Rogers in the 25th Century, which ran from 1979 to 1981, with the feature-length
pilot episode being released theatrically some months prior to the first broadcast of the series. After this, he was featured in a number of other TV shows and movies, including starring roles in the 1982 TV movie
Hear No Evil as Dragon, the short-lived series
Sidekicks (1986), and
E.A.R.T.H. Force (1990). In 1992, Gerard hosted the
reality TV series
Code 3, which followed firefighters from different areas of the U.S. as they responded to emergency calls. The show ran on the
Fox TV Network until the following year. For the remainder of the 1990s, Gerard made guest appearances on various TV shows, including
Fish Police,
Brotherly Love,
The Big Easy,
Days of Our Lives, and
Pacific Blue. In January 2007, Gerard was the subject of the one-hour documentary
Action Hero Makeover, which was written, produced, and directed by his then-longtime companion, Adrienne Crow for the
Discovery Health Channel. The film documented his year-long progress after undergoing life-saving
mini-gastric bypass surgery in October 2005. According to the program, he had been struggling with his weight for 40 years, losing weight only to gain it back. By the time of the program's production, his weight had risen to over , and he had many life-threatening health issues including a severe problem with
type 2 diabetes. Within five days of the surgery he had lost , within three months he had lost , and within ten months he lost a total of . Gerard and his
Buck Rogers co-star
Erin Gray reunited in 2007 for the TV film
Nuclear Hurricane, and also returned to the
Buck Rogers universe by playing the characters' parents in the pilot episode of
James Cawley's
Buck Rogers Begins Internet video series in 2009. He guest-starred as Admiral Jack Sheehan in "Kitumba", the January 1, 2014, episode of the fan web series
Star Trek: Phase II. In 2015, Gerard voiced Megatronus in
Transformers: Robots in Disguise. ==Personal life and death==