John McPhee, a master of telling nonfiction stories, became a teacher by accident 43 years ago when Princeton University needed a last-minute replacement. He has steered the course ever since, each spring when he takes breaks from writing books or pieces for The New Yorker, and it has become legendary in journalism circles.

The list of his alumni include some of today’s most well-known writers: David Remnick (now editor of The New Yorker), Eric Schlosser (author of Fast Food Nation), Tim Ferriss (author of the bestselling “4-Hour Workweek”), and so on.

McPhee lays out his course in his latest book, Draft No. 4: On the Writing Process, and I was eager to talk to him about his craftsmanship as a teacher. To my surprise, though, he downplayed his impact in the classroom, and even suggested that you can’t really teach the kind of writing that he, in fact, teaches.