Mark is now the retired former executive director of American Whitewater, a non-profit river advocacy group. Founded in 1954, American Whitewater's mission is “to conserve and restore America's whitewater rivers and to enhance opportunities to enjoy them safely.” American Whitewater is a membership organization representing a broad diversity of individual whitewater enthusiasts, river conservationists, and more than 100 local paddling club affiliates across America. The organization is the primary advocate for the preservation and protection of whitewater rivers throughout the United States, and connects the interests of human-powered recreational river users with ecological and science-based data to achieve the goals within its mission.