Plenty of postwar writers, from J. D. Salinger and Vladimir Nabokov to Thomas Pynchon, had little or nothing to do with writing programs. Nabokov taught a course on the novel at Cornell, in which Pynchon was a student, but he never taught creative writing.
Harvard once considered hiring Nabokov to teach literature; Roman Jackson, then a professor of linguistics there, is supposed to have asked whether the university was also prepared to hire an elephant to teach zoology.
--- From "Show or Tell"
The New Yorker
June 8 & 15, 2009