Well, I don't know where he is, but he's publishing articles on Native Americans. This one was through University of Texas but he's not on faculty there. Found a John L. Vantine in Arizona, but don't know if he's the right one. I'd start by emailing the University of Texas Press and ask for an address.
Men As Women, Women As Men; Changing Gender In Native American Cultures By: Lang, Sabine // Translator: Vantine, John L. // Long, Sabine
Softcover//Illustrated 432 pages Language: English Publication Date: July 1998 ; Publisher: University of Texas Press