[2] He is a member of the Society of American Foresters, The Nature Conservancy, and the National Wild Turkey Federation.

Clark was appointed by Republican Governor Tommy Thompson to the Lower Wisconsin Riverway Board in 1998, where he served as a representative for Columbia County.

"Doc" Hines by a substantial margin (15,936 to 11,304);[3] he was assigned to the standing committees on forestry, (of which he became chair in December 2009), on natural resources, and on rural economic development, and the Wisconsin Council on Tourism.

He was reelected in 2010 by a narrow margin (10,208 votes to 9921 for Republican Jack Cummings); he became the Minority Caucus Vice Chairperson for the 2011–2012 session.

[7] On February 27, 2019, it was announced that Wisconsin governor Tony Evers appointed Clark to the Department of Natural Resources board.