John L. Allen

Dr. Allen is a Wyoming native with a PhD in Geography from Clark University. His research interests are the exploration and historical cartography of North America, and he has authored many books and articles on that subject. He is professor and chair of the Geography Department at the University of Wyoming.

Wesley A. Brown

Mr. Brown has been a collector of old maps for thirty years. He confines his map collecting to two areas (1) the earliest world maps up to the year 1540 and (2) the exploration and settlement of Colorado. He has served as the President of the Rocky Mountain Map Society and Co-Chair of the Philip Lee Phillips Society, of the Library of Congress.

Louis De Vorsey

Dr. De Vorsey holds the Ph.D. degree in Historical Geography from the University of London. He is currently Professor Emeritus of Geography at the University of Georgia in the United States. Among his many books are included the revised and enlarged edition of Cumming's The Southeast In Early Maps and the Library of Congress Resource Guide for the Study of the Age of Discovery, Keys To The Encounter.

Ralph E. Ehrenberg

Dr. Ehrenberg has served as chief of Geography and Map Division, Library of Congress, and director of Cartographic Archives Division, U. S. National Archives. Publications include The Mapping of America; Library of Congress Geography and Maps: An Illustrated Guide; and Scholars' Guide to Washington, D.C. for Cartography & Remote Sensing.

John R. Hébert

Dr. Hébert is the Chief, Geography and Map Division, Library of Congress, and has worked in the Library since 1969. A historian, he has written on the 18th century Spanish presence in the U.S., historical cartography, and Latin American bibliography. He has co-authored, The Luso Hispanic World in Maps and authored Panoramic Maps of Cities in the United States and Canada; his latest work is Charting Louisiana; Five Hundred Years of Maps.

Stephen J. Leonard

A third-generation Coloradan, Leonard is Chairman of the History Department at Metropolitan State College of Denver. He has written several popular books on Colorado and Denver history including co-authoring Colorado: A History of the Centennial State and Denver Mining Camp to Metropolis (with Thomas J. Noel).

Richard D. Quartaroli

Mr. Quartaroli has boated the Colorado River through Grand Canyon over 150 times. He has a Master of Library and Information Science from the University of Texas, established the Research Library at the Glen Canyon Environmental Studies, is currently Special Collections Librarian at Northern Arizona University, and credits river running with his librarianship vocation and his history avocation.

Dennis Reinhartz

Professor of History and Russian at The University of Texas at Arlington, he offers undergraduate and graduate courses in the history of cartography. His books include The Mapping of the American Southwest, The Mapping of the Entradas into the Greater Southwest, The Cartographer and the Literati: Herman Moll and his Intellectual Circle, and Cartography and Empire: The Military Mapping of the Greater Southwest.

Tammy Stone

Dr. Stone is currently an Associate Dean in the College of Liberal Arts and Sciences and an Associate Professor in the Department of Anthropology at the University of Colorado at Denver and Health Sciences Center. She has written a book for the general public titled The Prehistory of Colorado (University of Utah Press) as well as numerous scholarly articles.