Mark P. Jensen, PhD, is a Professor and Vice Chair for Research in the Department of Rehabilitation Medicine at the University of Washington in Seattle, USA. He has published extensively (nine books and over 550 articles and book chapters) on the topics of pain assessment and treatment.

His research that has shown hypnosis to be effective for a variety of pain conditions, including pain assocaited with cancer, low back pain, and pain associated with physical disabilities such as spinal cord injury and multiple sclerisos.

He has also been evaluating the mechanisms of hypnotic analgesia – in particular the effects of hypnosis on brain states and brain activity, and how these brain activity changes may facilitate response to hypnotic suggestions.