Hank Heasler: Hank Heasler. Self: Yellowstone: America's First National Park
Known For: Yellowstone: America's First National Park (Park Geologist at Yellowstone National Park), Volcanoes: A Window Into Geological Time (Geologist, Yellowstone National ParkSelf - Park Ranger), North America (Self - Geologist: Yellowstone NP), NZZ Format (Geologist, Yellowstone National ParkSelf - Park Ranger)