Ehhh! It's Happy Days' Arthur "The Fonz" Fonzarelli or as he is known is real life, Henry Winkler (born October 30, 1945 in New York City)
A plot on Happy Days involving Winkler (as Fonzie) created the idiom "Jumping the Shark", where something has outlived its freshness (i.e. a TV Show). Happy Days officially jumped the shark.
Offscreen, Henry Winkler has been working with children with learning disabilities including dyslexia, which Winkler didn't know he had until he was 31 when he had his stepson tested. Since 2003, Winkler has collaborated with Lin Oliver on a series of children's books about a 4th grade boy, Hank Zipzer, who is dyslexic.
On February 11, 2011, Winkler was honorarily knighted for his work with helping children with dyslexia and other learning disabilities.
Winker plays the part of the obnoxious traffic reporter in Dan Vs. Traffic.