Mathew Geltzeiler, M.D.

Mathew Geltzeiler, M.D., is a Senior Professor at Oregon Health & Science University. His research focuses on skull base surgery, surgical oncology, and otorhinolaryngology, with specific interests in sinonasal malignancies, anterior skull base defects, and pituitary adenoma surgery. His recent work includes establishing multidisciplinary consensus guidelines for sinonasal mass evaluation, defining the minimal clinically important difference of the Sinonasal Outcome Test in sinonasal malignancy, and leading international Delphi studies to identify research priorities and core outcome sets for pituitary surgery. He has also published on endoscopically confirmed false-positive β2-transferrin in postoperative settings and genomic testing for anterior skull base malignancies. His contributions have shaped clinical standards in endoscopic skull base repair and multidisciplinary care.