He has international practice experience, having worked in Thailand, Cambodia, and Newfoundland, Canada. He has served on many advisory boards and as a consultant to a variety of companies and organizations. In addition to being a full-time clinician, he is Director of Medical Affairs, Valeant Pharmaceuticals, Inc. Dr. Nagelberg writes a bimonthly column for Dental Economics magazine and has provided over 350 continuing education presentations over the past 14 years.