Dr. Stephen Cohen is one of the prominent endodontic clinicians in the United States, and he lectures worldwide on endodontics. Dr. Cohen completed his studies in the Endodontic Postgraduate Program at the University of Pennsylvania in 1969 before beginning his private practice. From 1970 until 1988, Dr. Cohen served as Chairman of the Department of Endodontics at the Arthur A. Dugoni School of Dentistry, University of the Pacific, where he has continued his commitment to education as an Adjunct Clinical Professor of Endodontics; in addition, he was an Adjunct Clinical Professor of Endodontics in the Department of Preventive and Restorative Dentistry, University of California, San Francisco; and Director of the Endodontic Postgraduate Program at the Riyadh School of Dentistry and Pharmacy in Saudi Arabia. Dr. Cohen was the senior editor of all nine editions of the definitive endodontics textbook,Pathways of the Pulp, and is a co-editor of the 10th edition (2010), which was renamed Cohen’s Pathways of the Pulp. He is also a co-editor of the new textbook, A Clinical Guide to Dental Traumatology. Dr. Cohen is a Diplomate of the American Board of Endodontics and has held leadership positions in many of the major professional and academic organizations in endodontics. He maintains a full-time endodontic practice in San Francisco.   www.Cohendodontics.com