Bruce Mueller is owner of the C&M Rock Shop in Honor, Michigan. He holds a master"s degree in geology from the University of Illinois. He is also the author of The Complete Guide to Petoskey Stones.Kevin Gauthier is a business graduate from Michigan State University and has completed courses through Gem Institute of America (GIA). He has spent a lifetime collecting, cutting, and polishing the gems found around Lake Huron. Kevin is co-author with Bruce Mueller of Lake Michigan Rock Picker’s Guide and Lake Superior Rock Picker"s Guide. He is owner of Korner Gem in Traverse City, Michigan: www.kornergem.com.