Mystery Monday - Who is the man in the middle?

I found this 8x10 in one of my grandmother's albums. It is Ward Gillespie (1889-1978) at left and Mary Ada Ross-Gillespie (1894-1987) at right aboard the SS President Roosevelt. Unfortunately, I have no idea who the person in the middle is. I think he must be a politician or actor of the 1960s.

SS President Roosevelt served the American President Lines from 1960 to 1970. President Roosevelt apparently sailed the Pacific Ocean from California. That's about all I know about this photo.

Who am I?