Attended same opera school as Jackie Chan, Biao Yuen, Wah Yuen and Corey Yuen.
Longtime friends with Jackie Chan and directed Chan in Heart of a Dragon (1985), among several.
He was first called Sammo in Hong Kong because of his resemblance to a popular Chinese cartoon character. The character's name was "Sam Mo" which is Cantonese for "three hairs," which is all the cartoon character had.
Eldest grandson of actress Szu-Ying Chien and writer/director Chung-Ho Hung.
When his work first started getting released in the West, he was billed as Samo Hung. It was not until years later, after English-speakers kept mispronouncing his first name as 'say-mo', that the M was doubled to get the 'Sammo' that we are more familiar with now.
He got the distinctive scar on his upper lip and at the corner of his mouth in a street fight. Someone shoved a broken Coke bottle in his face.
Has three sons and one daughter; Timmy Hung, Jimmy Hung, Sammy Hung and Stephanie Hung.
Family roots are from Suzhou, Jiangsu province.
He is the elder brother of Chi Kit Lee.
He received the Star Asia Lifetime Achievement Award at the 2010 New York Asian Film Festival.
George Lucas originally wanted him to be the lightsaber fight choreographer for the Star Wars prequels.