Mark-Paul Harry Gosselaar (born March 1, 1974) is an American actor. He portrayed Zack Morris in NBC's Saved by the Bell, detective John Clark in NYPD Blue, and more recently as Jerry Keller-man in TNT's Raising the Bar.Gosselaar first came to public notice in the role of Zack Morris, the star of the hit series Saved by the Bell, which aired on NBC from 1989 to 1993. He reprised the role in two TV movies and a less-successful spin-off, Saved by the Bell: The College Years. In 1995, Gosselaar did a Cameo as Zack Morris in second spin-off series Saved by the Bell: The New Class in the episode "Goodbye, Bayside - Part 2", along with Mario López as A.C. Slater and Lark Voorhies as Lisa Turtle.