William Lawrence "Bill" Sullivan is an author of outdoor guide books, histories, and fiction.
He has written over twenty books, almost all of them related in some way to his home state of Oregon.
Before he began his writing career, he attended several colleges, earning degrees from Cornell University and the University of Oregon.
His "100 hikes" guide book series is especially popular with people who enjoy backpacking in Oregon's wilderness areas.
In 2005, the Oregon Cultural Heritage Commission selected one of his books, Listening for Coyote, as one of the 100 most significant books in Oregon history.