Glenn has worked in the mushroom cultivation industry off and on since 1989. After getting a Bachelor's in Biology from UC Santa Cruz he worked at a button mushroom farm in the Santa Cruz area. His interest grew to wild mushrooms after taking a couple of classes from David Arora. He went to the University of Washington to study taxonomy and ecology of wild mushrooms and earned his MS degree. Currently he works at Gourmet Mushrooms in Sebastopol, California growing wood-decomposing specialty mushrooms.