Randal Kleiser — American Director born on July 20, 1946,

John Randal Kleiser is an American film director and producer, perhaps best known for directing the 1978 musical film Grease... (wikipedia)

We wanted a supporting cast that would appeal to Baby Boomers who grew up in the fifties.
I loved the idea of Travolta sitting on the kid's swing, pining away for his girlfriend.
I told her it was a bigger than life musical, that all the actors were going to be about the same age, late twenties into thirties. It would be a style; a kind of surreal high school.
In order to do a musical now, a style must be developed that works for today's audience.
Well, once I did 'Grease,' everyone was offering me studio pictures in a similar vein - you know, popcorn movie.