Thomas D. Mangelsen is one of the most influential nature photographers in the world. Guided by a deep conservation ethic, Tom is legendary for his advocacy in seeking protection of rare and imperiled species. Tom has a special passion for grizzlies, wolves and mountain lions, and co-wrote The Grizzlies of Pilgrim Creek, with Todd Wilkinson, that features a grizzly bear known as 399 -- perhaps the most famous grizzly in the world.

Tom and Louisa go way back, sharing a journey towards a more compassionate way of treating our fellow non-human travelers. In this wide-ranging conversation, Tom shares reflections on his evolution from hunting and trapping to carrying a camera instead of a gun, and his challenges as a conservationist speaking up for wildlife in an arena that promotes killing species like grizzlies, mountain lions and wolves -- for fun.