After starting out as a child actor, he shot to worldwide fame as Richie Cunningham in Happy Days back in 1974.
And now Ron Howard, 67, has revealed that he began losing his hair aged 20 due to anxiety over Henry Winkler's The Fonz eclipsing his character in the American sitcom.
In his joint memoir with brother Clint, 62, titled The Boys: A Memoir of Hollywood and Family, the actor detailed how he developed a stress-induced skin condition which resulted in his hair 'falling out in alarming clumps'.
What happened? In his memoir titled, The Boys: A Memoir of Hollywood and Family, Ron Howard, 67, has revealed that he began losing his hair aged 20 (Pictured in 2020)
During the early run of Happy Days - which ran for a decade - ABC toyed with renaming the show 'Fonzie's Happy Days' such was the character's popularity.
In his book, Ron explains: 'The biggest stressor of all was Fonzie. Not Henry [Winkler], but Fonzie.
'It did not escape my notice that as the season went on, the Fonz was getting more and more screen time.
'I didn't handle my stress particularly well,' he writes. 'I probably would have benefited from seeing a psychotherapist