Stephen Lentz served in Guatemala from 1983 to 1985 and worked in natural resources. His e-mail [slentz@elite.net] doesn't work. Please email me at lord_orman@hotmail.com if you have any info on his whereabouts. Last I heard he was at Northern Arizona University in 1997 - but I lost track of him since then. He wanted to get a PhD on the Creeping Devil Cactus (Stenocereus eruca).