Harold L. Crossley, D.D.S., Ph.D. is a Professor Emeritus at the University of Maryland Dental School. A native of Rhode Island, Dr. Crossley received a Bachelor of Science degree in Pharmacy from the University of Rhode Island in 1964. He later was awarded the Master of Science (1970) and Doctorate degrees (1972) in Pharmacology. The University of Maryland Dental School in Baltimore awarded Dr. Crossley the D.D.S. degree in 1980. Since that time he has been the Director of Curriculum Innovation and Management, Director of Conjoint Sciences and Preclinical Studies and is currently the Director of Continuing Dental Education at the Dental School. The liaison between the classroom and his dental practice which he mentored on a part-time basis in the Dental School Intramural Faculty Practice produced a practical approach to understanding the pharmacology of drugs used in the dental office.
Dr. Crossley has co-authored a number of articles and four books dealing with a variety of topics within the field of pharmacology. Other areas of expertise include the pharmacology of street drugs and chemical dependency. He has been appointed to the Governor's Commission on Prescription Drug Abuse, serves on the Maryland State Dental Association’s Well-Being Committee and was a member of the University Interdisciplinary Committee for Drug Abuse Education. He is an active member of Phi Kappa Phi, Omicron Kappa Upsilon Honorary Dental Society, and the International College of Dentists. He has been a consultant for the United States Drug Enforcement Administration and other law enforcement agencies since 1974. Drawing on this unique background, Dr. Crossley has become nationally and internationally recognized as an expert on street drugs and chemical dependency as well as the clinical pharmacology of dental drugs.