Thomas C. Johnson is director of the Large Lakes Observatory at the University of Minnesota in Duluth. In 1975 he obtained his Ph.D. in oceanography from the Scripps Institution of Oceanography at UCSD in LaJolla, California. Dr. Johnson has authored and coauthored more than 62 publications. He is the originator and present director of IDEAL., Eric O. Odada is a professor of geology at the University of Nairobi, Kenya. He received his Ph.D. in applied marine geochemistry in 1986 from Imperial College, London University. Dr. Odada is currently scientific liaison in Africa for the Past Global Changes (PAGES) Core Project, a part of the International Geosphere-Biosphere Programme (IGBP). He is scientific coordinator for the IDEAL project.