Short answers, pulled from the story.
Ferrigno began bodybuilding because of childhood bullying tied to his hearing loss and a difficult relationship with his father. He has said his father rejected him for not being the perfect son, and that he fantasized about being like the Hulk, which led him to start weight training at age 13.
Ferrigno lost 75 to 80 percent of his hearing, which he believes resulted from a series of ear infections soon after he was born. His condition was not diagnosed until he was three years old. He has used hearing aids since age five and later received a cochlear implant that restored much of his hearing.
Ferrigno won the IFBB Mr. America title and two consecutive IFBB Mr. Universe titles. He placed second at the 1974 Mr. Olympia and third in 1975. He also finished fourth in the inaugural World's Strongest Man competition in 1977 in a field of eight competitors.
Ferrigno played the Hulk in the CBS television series The Incredible Hulk, which ran from 1977 to 1982 across 82 episodes. Bill Bixby played the human alter ego. Ferrigno has described Bixby as a mentor and father figure who directed him in some episodes.
Yes, Ferrigno voiced the Hulk in Marvel Cinematic Universe films starting with the 2008 film The Incredible Hulk. He continued in that vocal role, uncredited, through Avengers: Age of Ultron in 2015. Mark Ruffalo has voiced the Hulk in subsequent films.
Ferrigno has served as a reserve sheriff's deputy in Los Angeles County, a volunteer posse member in Maricopa County, Arizona, a reserve deputy in San Luis Obispo County (where he completed his Level I peace officer academy), and a special deputy in Delaware County, Ohio.