Stephen Marshak is Professor of Geology and Head of the Department of Geology at the University of Illinois, Urbana-Champaign. He holds a Ph.D. from Columbia University, an M.S. from the University of Arizona, and a B.A. from Cornell University. He has served as Chair of the Division of Structural Geology and Tectonics of the Geological Society of America. Dr. Marshak has written numerous research articles on topics in structural geology and tectonics, and has authored or co-authored four books: Basic Methods of Structural Geology; Earth Structure, Earth: Portrait of a Planet; and Essentials of Geology.

The First Edition of Earth: Portrait of a Planet revolutionized the study of geology by integrating traditional geological concepts with the most recent theoretical advances in geology, including theories of plate tectonics and earth systems science. Adopted at over 300 schools worldwide, this innovative text has quickly become the best-selling introductory text in the field.

Retaining the core strengths of the First Edition, the Second Edition has been meticulously revised, adding engaging new material and learning tools. The text's popular art program has been significantly expanded, including new satellite photographs and eighteen new "What a Geologist Sees" illustrations. Additionally, the Second Edition features the most effective and current multimedia tools available for instructors and students.