Specializing in the field of head and neck pathology and cytopathology, Dr. William Faquin serves as the Director of Head and Neck Pathology at Mass. Eye and Ear and Massachusetts General Hospital. His main focus is on cytopathology of the head and neck and the thyroid gland. 

He has authored more than 200 peer-reviewed publications and has co-authored books on head and neck cytohistology, salivary gland cytopathology, and thyroid cytopathology. Dr. Faquin is a co-author of the Bethesda System for Reporting Thyroid Cytopathology, co-chair of the College of American Pathologists Evidence-Based Guidelines Committee for the testing of head and neck squamous cell carcinomas for high-risk HPV, and co-chair of the Milan System for Reporting Salivary Gland Cytopathology sponsored by the ASC and IAC. He has also taught and directed numerous local, national, and international seminars, workshops, and courses. 

His current research interests involve translational studies pertaining to the detection, diagnosis, and prognostication of cancers of the thyroid and salivary glands, squamous cell carcinomas of the oropharynx, and tumors of the jaws and oral cavity.