He graduated from the University of Minnesota School of Dentistry and entered military service. After practicing four years of general dentistry in the U.S. Air Force, he entered a USAF-sponsored periodontics residency and received a Certificate of Postgraduate Study in Periodontics and a Master of Science in Dentistry Degree (M.S.D.) from Indiana University in 1981. During his military career, he held several teaching positions in both one and two year Advanced Education in General Dentistry residency programs. Dr. Lasho is a Diplomate of the American Board of Periodontology.