Jacob Lieberman is an internationally recognized specialist in the physical and emotional treatment of hyperfunctional voice disorders. As an osteopath and psychotherapist he has developed the Lieberman protocol for laryngeal examinations as well as manual therapy to relieve muscle tension and mobilize the laryngeal joints. He is a staff member at the Lewisham University Hospital in London and the MEDICAL VOICE CENTER in Hamburg. He is the main author and co-author of publications on questions of posture and voice disorders as well as the mechanical dysfunction of the larynx. He has contributed to standard works: „The Voice Clinic Handbook“ (Harris et al., 1998, Whurr Publishers, London), „Diagnosis and Treatment of Voice Disorders“ (Sataloff).
His research focuses on the effects of laryngeal manipulation on vocalization.