Mark Elbroch Mark Elbroch is the author of numerous books, including the National Outdoor Award-winning Mammal Tracks and Sign, Stackpole Books, 2003. Houghton Mifflin chose Mark to revise Olaus Murie's fifty-year-old classic, the Peterson Field Guide to Anial Tracks. He has been practicing wilderness survival skills for more than 12 years and has taught these skills in workshops across the country. He is sought after as a speaker at conferences and environmental centers and has appeared on public radio discussing wildlife tracking techniques. Read More Read Less