Horst J. Schor is the originator o the Landforming and Revegetation Concept and is Principal of H. J. Schor Consulting. He has developed landform grading designs that have been implemented in a variety of hillside grading and mining reclamation projects for a diverse list of clients. He has been a guest lecturer at the University of Wisconsin-Madison, Dresden University of Technology, Germany, and the University of California, Irvine.

Donald H. Gray, PHD, is Professor Emeritus of Civil and Environmental Engineering at the University of Michigan. In addition to speaking and teaching internationally, he has coauthored three books on subjects related geotechnical engineering and biotechnical slope protection.