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John R. "Jack" Lorenz (March 14, 1939 – March 2, 2009) was an American environmental activist who led the Izaak Walton League. He served the League for nearly two decades. Lorenz was a vocal advocate for ethical use of outdoor spaces and lobbied off-road vehicle manufacturers to avoid advertisements depicting and glorifying irresponsible treatment of forests and streams. An avid fisherman, Lorenz fished in all 50 states and all of Canada’s provinces.