Dr. Butler trained in experimental neuroanatomy, neurosurgery and neuroscience methodologies and carried out research in medical science specialising in the field of neuroendocrinology, in which he holds a doctoral degree from the University of London.

He is an instructor in surgical applications of hypnosis and has taught clinical hypnosis applications to surgeons and anaesthetists in a course accredited by the Royal College of Anaesthetists.

He has lectured to major businesses including Goldman Sachs, Credit Suisse, BUPA, Ernst & Young, etc.
He has acted as an expert witness and as an advisor to the police in legal cases involving hypnosis.

Standard setting & regulation activity

He has been active for 30 years in the development of professional psychological therapies in the UK and internationally and has served on committees and boards of government and private initiatives in setting training standards for this field.

He organised the first conference of heads and delegates of hypnotherapy schools and registers in 1986 to formally initiate processes of standard-setting for the training and professional regulation of hypnotherapists in the UK.

He played a major role in many private and government-sponsored initiatives concerned with training requirements, occupational standards and self-regulation of hypnotherapists that were established in the late 1980s and 1990s. His contribution to the profession in the UK was formally recognized in 2004 by an award from a national confederation of hypnotherapists.