T.M Maple was Canadian. And died a few years back:

http://en.wikipedia.org/wiki/T._M._Maple

 Quote:
T.M. Maple (c. 1956[1]–1994) was the pseudonym of Jim Burke, a Canadian who wrote more than 3,000 letters to comic book letter columns between 1977 and 1994.[2]

Burke's letters were quite popular among readers as well as editors, and he wrote prolifically to a diverse number of comic publishing companies and titles. Burke originally signed his letters as "The Mad Maple," but Marvel Comics editor Tom DeFalco abbreviated it to "T.M. Maple" to make it sound like a real name (thus circumventing a new policy at the company to stop printing letters submitted under pseudonyms).[2] Burke took a liking to the new name and began using it exclusively (including variations like "Theodore Maddox Maplehurst") until 1988, when in Scott McCloud's Zot! #21 he revealed his real name.[2]

Burke published a fanzine about comics in the late 1980s. With artist/publisher Allen Freeman, Burke co-created the superhero Captain Optimist.[3]

Some believe that the Simpsons' character the Comic Book Guy was based on Maple.[4] Simpsons creator Matt Groening, however, has repeatedly stated that the Comic Book Guy was based on "... every comic-bookstore guy in America".[5]

After Burke died of a heart attack in 1994, he was eulogized in a number of letter columns published by DC Comics, the company he probably wrote to most prolifically.