Never heard of him

Spied as I was wandering randomly around Barnes & Noble
“In 1981 I received my Ph.D. in theoretical physics from the University of California at Berkeley.” 

The Grand Design (2010), co-authored with Stephen Hawking.
The Drunkard’s Walk: the story of randomness and its role in our lives (2008)

Plus two co-authored children’s books. He’s at Cal Tech.