Thomas' career began in 1944, when Hollywood was still a small, centralized community, tightly controlled by a handful of studios, and continued well into the 21st century. During his nearly seven decades writing for the AP, Thomas reviewed hundreds of films and television shows, compiled hundreds of celebrity obituaries and wrote numerous retrospective pieces on Hollywood and how it had changed.
He was the author of nearly three dozen books, including biographies of Disney, Brando and Crawford and an acclaimed portrait of studio mogul Harry Cohn, "King Cohn." He wrote, produced and appeared in a handful of television specials on the Academy Awards and was a guest on numerous television programs including "The Tonight Show," ''Good Morning America" and "Nightline." His biographies of reclusive billionaire Howard Hughes and the comedy team of Abbott and Costello were made into television movies.
He is listed twice in Guinness World Records, for most consecutive Academy Awards shows covered by an entertainment reporter and for longest career as an entertainment reporter (1944-2010).
In 1988, he became the first reporter-author awarded a star on Hollywood's Walk of Fame.
But one of his biggest stories had nothing to do with entertainment.
Helping out during the 1968 presidential election, Thomas had been assigned to cover Sen. Kennedy on the night the New York Democrat won the California primary. Minutes after declaring victory, Kennedy was shot to death in the kitchen of Los Angeles' Ambassador Hotel.
"I was waiting in the press room for Kennedy to arrive when I heard what sounded like the popping of balloons in the hotel kitchen," Thomas would recount years later.
"I rushed into the kitchen where men were screaming and women sobbing," he recalled. "I jumped onto a pile of kitchen trays and saw Kennedy lying on the floor, his head bloody."
He ran to a phone and delivered the bulletin to The Associated Press.
As the son of a newspaper editor turned Hollywood press agent, Robert Joseph Thomas seemed destined to become an entertainment writer from his earliest days. In junior high school and high school he wrote entertainment columns for the campus newspaper, and in college his favorite reading was the industry trade paper Daily Variety.
But when he joined the AP in Los Angeles in 1943, it was with aspirations of becoming a war correspondent. The closest he got to that was when the wire service named him its Fresno, Calif., correspondent, a job he gave up after little more than a year.
"It gets so damn hot in Fresno in the summer and nothing much ever happens there," he once told a colleague.
He returned to the AP's LA bureau in 1944 and was soon named its entertainment reporter. He was also told that the byline he'd been using — Robert J. Thomas — had to go.
"Too formal for a young guy who's going to work the Hollywood beat," he said the AP's bureau chief told him. "From now on your byline is 'Bob Thomas.'"
Soon he would become a ubiquitous presence in Hollywood, attending awards shows, wandering studio back lots or going from table to table at the Polo Lounge, Musso and Frank and other favored Hollywood hangouts of the day. The gentlemanly, soft-spoken reporter with the wry sense of humor rarely had trouble getting people to talk to him and enjoyed access to the stars that modern journalists rarely attain, whether visiting with Nicholson at his home or chatting on the set with Tracy and Hepburn.