Seth Aaron Rogen is a Canadian-American actor, comedian, writer, director, and producer. Having begun as a stand-up comedian in Vancouver, he moved to Los Angeles for a part in Judd Apatow's series Freaks and Geeks, and then got a part on the sitcom Undeclared, which also hired him as a writer.
this kinda 'splains it -- he's a Canadian Lefty:
Seth Aaron Rogen is a Canadian-American actor, comedian, writer, director, and producer. Having begun as a stand-up comedian in Vancouver, he moved to Los Angeles for a part in Judd Apatow's series Freaks and Geeks, and then got a part on the sitcom Undeclared, which also hired him as a writer.