What year did the author of The Tunnel win the William Dean Howells Medal?
The Tunnel (novel): The Tunnel is William H. Gass's 1995 "magnum opus" that took 26 years to write and earned him the American Book Award of 1996. William H. Gass:  His 2013 novel "Middle C" won the 2015 William Dean Howells Medal.
2015