He won the award last year, and the AAN press release says this is his "third award" -- though it's not clear whether that includes simple nominations or not. I'd ask the hombre for clarification, but he aint in the office right now. Probably signing some books, accepting an award or eating a burrito somewhere.
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[5/20: Corrected to remove "American" from the AAN's name. For the truth about Gustavo's award count, check the comment left below by AAN Executive Director Richard Karpel]