Dr. Glassman is Diplomate of the American Academy of Craniofacial Pain, Diplomate of the American Academy of Pain Management, a Diplomate of the American Academy of Dental Sleep Medicine and a Fellow of the International College of Craniomandibular Disorders. He serves on the Medical Advisory Board of TSOI, a publicly held biomedical company. He was on staff of the Lehigh Valley Hospital network and serves as clinical instructor in Craniofacial Pain and Sleep Disorders. He is the former Co-Medical Director of the St. Lukes Allentown Headache Center. Among his recent publications are The Effect of Regional Anesthetic Sphenopalatine Ganglion Block on Self‐Reported Pain in Patients With Status Migrainosus in HEADACHE, and The Curious History of Occlusion in Dentistry in DENTALTOWN. He teaches and lectures internationally on orofacial pain, joint dysfunction and sleep disorders. While he has retired from his active practice limited to orofacial pain, joint dysfunction and sleep medicine, he continues to lecture nationally and internationally. He is a adjunct lecturer at Tufts University school of Dental Medicine Craniofacial Pain Program.

In addition to his expertise in dentistry, he and his wife Sharon have been active in the Civic Theater in Allentown, Pennsylvania where Barry has starred in numerous productions notably as Scrooge in The Christmas Carol and as Morrie Schwartz in the play, Tuesdays with Morrie..