Dr. Clark is a nationally and internationally recognized expert on the subject of nitrous oxide/oxygen therapy. He is a graduate of the University of California School of Dentistry and completed his training in Oral Maxillofacial Surgery at Columbia University. He is a Professor at the University of Colorado School of Dental Medicine and on the faculty of the medical school there as well. He has been President of the American Society for the Advancement of Anesthesia in Dentistry and the American Dental Society of Anesthesia for the states of Colorado, Arizona, Kansas, Utah, Wyoming and New Mexico. Dr. Clark did the original clinical research on Versed (Midazolam) and Romazicon (Flumazenil), the antagonist for all the benzodiazepine class of drugs. He is on the Board of Directors for the American Dental Society of Anesthesia and a member of the American Dental Association Council on Scientific Affairs. He is co-author of the best-selling text Handbook of Nitrous Oxide and Oxygen Sedation, published by Elsevier.