Blade Runner was based on Philip K Dick's Do Androids Dream of Electric Sheep, Screamers based on Dick's Second Variety, Paycheck and A Scanner Darkly, based on novella's of the same name. The Adjustment Bureau is based on his The Adjustment Team.
And those are just the famous movies.
Of other authors
Barry B Longyear wrote Enemy Mine, the movie had the same name, admitadly the moive was a bit of a flop.
Thee were two The LawnMower Man adaptations of Steven King's short story, one faithful, one not. Of course many of King's stories have been made into films.
Who Goes There? by John W. Campbell, Jr. became The Thing, three times, Also comics and a vidoe game, before it was standard to write a game as part of the mechandising.
I've lost count of how many The Raven movies are out there. And War of the World's.