Professor Gregory "Gregg" O'Hara is the tritagonist of the 1998 Disney film Mighty Joe Young. He is portrayed by the late Bill Paxton.
He is a refuge director who convinces Jill Young that her giant gorilla Joe will be much safer from poachers if they move to Los Angeles. Jill agrees and Gregg starts to fall for Jill. But evil poacher Andrei Strasser is back for revenge on Joe and Jill and Greg must do whatever they can to save him.
Gallery
Joe holds Greg up by his foot
Jill and Gregg at the gala
Greg & Jill's kiss
Gregg discovers a poacher's noise maker that the maintenance found causing him to realize that Strasser is a poacher.
Gregg speeding his car to save Jill
Jill and Greg open a new wildlife preserve for Joe
Jill and Gregg happily watch Joe roam free in his new enclosure.