You can reach MPG by email at: matthewprattguterl @ gmail.com
Or at his Brown email address, which you can find here.
You can mail him stuff at:
Department of American Studies
71 George Street, Nicholson House
Providence, RI 02912
He infrequently and imperfectly uses twitter: @matthewguterl
He sometimes posts things on instagram: @matthewguterl
His literary agent, Faith Childs, can be reached here:
Faith Childs Literary Agency, Inc.
111 John Street, Suite 1620
New York, NY 10038