 Soon after, he founded the one-man printing operation, dPress, the backlists of which now contain some two hundred titles.In 1965, he attended the Berkeley Poetry Conference, what John Bennett, in 'Air Guitar' (an Ellensburg Daily Record column), has called , “an event creating white light intensity that rivaled any drug high and had more staying power.” This convergence of the Black Mountain, San Francisco Renaissance, Beat and Northwest Schools gave Denner the pivotal opportunity to study under such avant-garde poets as Charles Olson, Ed Dorn, Robert Creeley, Allen Ginsberg, Joanne Kyger, Lew Welch, and Jack Spicer.Later he would study with Robert Bly, Gary Snyder, Philip Whalen, Denise Levertov and Carolyn Kizer at Fort Worden Center for the Arts in Port Townsend, Washington.