Where's Jerry? Who does he look like?

My pal, Jim Whitmer, wrote and included the photo below. He and his wife,  Mary, met Jerry 46 years ago this fall. Jim writes:

We were all in a major photo shoot for Campus Life Magazine that was published in Feb. '68 - the lead article was about the "pressures" on a youth worker - and I was supposed to represent the stereotypical youth worker.  The attached 2-page photo spread show me (in the goofy cardigan sweater, with Mary hanging on me.)  But I've noted one of the important "extras" on the set.  He was known as "Moose" Jenkins back then, and the magazine actually called him that in the credits of the models.
 We've been friends with Jerry ever since.  Just a little "history" for you.

Respond to this and tell me what famous actor or literary character you think Jerry resembled 45 years ago.