Facial hair expert and author Allan Peterkin appeared on The Tonight Show
on June 15 to offer host Jimmy Fallon advice on his mustache. Fallon has declared 2017 "The Summer of Stache," and Allan helped him decide on a "Baby Walrus" mustache that he can grow out into a "Handlebar."
Allan has written three books on the subject: One Thousand Mustaches, One Thousand Beards
, and (with Nick Burns) The Bearded Gentleman
You can watch the interview here