Dr. Bleier is the Director of Endoscopic Skull Base Surgery, a Co-Director of the Center for Thyroid Eye Disease and Orbital Surgery, and a member of the Sinus Center at the Massachusetts Eye and Ear Infirmary. Dr. Bleier has authored over 100 peer-reviewed articles, book chapters, and a textbook in the field of sinus-related disease. He lectures both nationally and internationally on his research interests, which include the role of P-glycoprotein as an etiologic agent and therapeutic target in CRS, intranasal drug delivery techniques to the brain, and endoscopic management of orbit and skull base tumors.