Robert W. Christopherson is Professor Emeritus of Geography, American River College, and is the author of the leading physical geography texts in the US and Canada: Geosystems, 7/E, Elemental Geosystems, 5/E, Geosystems Canadian Edition, 2/E, and Applied Physical Geography, 7/E, all published by Pearson Prentice Hall. He attended Cal State University-Chico, and Miami University, Oxford, Ohio. His first textbook was published in 1992. He has spoken across the US and Canada to hundreds of colleges, groups, and at professional meetings. He and his nature photographer wife have completed 10 polar expeditions since September 2003 to gather information and photos for his textbooks. Robert was appointed recently to the Editorial Board of Goode's World Atlas, 22nd Edition, published by Rand McNally.