Welcome to MANGELSEN—Images of Nature Gallery in Jackson, Wyoming. Thomas D. Mangelsen's first gallery opened here in Jackson, Wyoming in 1978. His work is set in a beautiful three story building, one block north of the historical town square. Seven days a week, visitors and locals alike, enjoy Tom's exceptional work in a relaxed, "at home" atmosphere. Jackson Hole is one of the most spectacular valleys in the United States. It includes lovely rivers, streams, and lakes.