David R. Montgomery is a professor of earth and space sciences; Susan Bolton is a professor of forest resources; Derek B. Booth is a research associate professor of civil and environmental engineering; and Leslie Wall is a research associate in forest resources--all at the University of Washington, Seattle. Other contributors include Tim Abbe, Eric Beamer, Timothy Beeschie, Dean Rae Berg, John Bethel, Robert E. Bilby, John M. Buffington, Brian D. Collins, Loveday Conquest, Kevin Fetherston, Martin Fox, Ralph A. Haugerud, Lisa Holsinger, Sara M. Jensen, Christopher P. Konrad, Martin Liermann, John Lombard, Gino Lucchetti, Arthur McKee, Michael J. Maki, Dale E. Miller, Kathryn Neal, Roger A. Nichols, George Pess, Geoffrey C. Poole, Stephen C. Ralph, Philip Roni, Clare M. Ryan, Amir J. Sheikh, Peter B. Skidmore, Sallie G. Sprague, Ashley Steel, Kathy Goetz Troost, and Richard D. Woodsmith.