Forensic geologist Scott F. Wolter is a 30-year collector of Lake Superior agates. Over the years Wolter has found many beautiful "lakers" in and around Minnesota, Wisconsin, Michigan and Iowa. He has authored two other books on the subject - The Lake Superior Agate and The Lake Superior Agate: One Man's Journey - and his passion for the stones, and that of other Lake Superior agate collectors and fans, culminates annually at the Moose Lake, Minnesota Agate Days festival each July. Wolter runs American Petrographic Services laboratory in St. Paul, Minnesota where he and his team of geologists have conducted over 5,000 investigations on concrete, rock and stone artifacts, including the fire-damaged concrete from the Pentagon following the attacks of 9/11. A graduate of the University of Minnesota Duluth, Wolter and his wife, Janet have two children and live in suburban Minneapolis.