Walter N. Trenerry spent two years researching and writing about the colorful, if sometimes gruesome, deeds of some of Minnesota's most notorious criminals. He is a graduate of Har...ver maisWalter N. Trenerry spent two years researching and writing about the colorful, if sometimes gruesome, deeds of some of Minnesota's most notorious criminals. He is a graduate of Harvard Law School, former professor at the St. Paul College of Law, retired lawyer, and amateur historian.ver menos