Centerfold is run by a not for profit organization, and in it you will be teaching Origami in a classroom setting. As such, under US copyright law I do not think you would be violating the artist’s copyright protection by teaching this in the aforementioned situation. You can easily look up the relevant statutes on the internet.
I know its nicer to go find the artist and ask, but I believe spreading Origami is more important than assuaging anyone’s ego.
