Roger del Moral is Professor of Biology at the University of Washington. His research includes the mechanisms of vegetation response to disturbances caused by volcanoes, glaciers, grazing and urbanization. He has practised wetland restoration for over 20 years and has experience with dune and subalpine meadow restoration. He had studied volcanoes on four continents, including detailed studies of Mount St. Helens that started in 1980.
Lawrence R. Walker is Professor of Biology at the University of Nevada Las Vegas. His research focuses on ecological plant succession and the theoretical and practical lessons for restoration. His research in succession and restoration has encompassed work on volcanoes, dunes, glacial moraines, floodplains, landslides, cliffs, hurricanes, reservoir drawdown zones, abandoned roads and mine tailings.