Mark Paul Gosselaar with his kids Michael and Ava, and girlfriend Catriona McGinn at the world premiere of 'The Muppets' in Los Angeles, California, on Nov 12, 2011.

Mark Paul Gosselaar, best known for his roles as Zack Morris in Saved by the Bell and Detective John Clark in NYPD Blue, has two children with his ex-wife Lisa Ann Russell.

They are son Michael Charles (born 2004) and daughter Ava Lorenn (born 2006).

He is quoted in the Washington Post:

“Having children has made me mature in ways that I think are positive to my career and yes, my family does affect the type of work that I accept; mainly with travelling. If a show were to be filmed in another state other than California, I would have to make a very educated decision regarding it.”