Bio
John Marsden, Ph.D. is a chartered research psychologist, best known to television audiences as the presenter of the BBC documentary series Body Hits.
He is currently Senior Lecturer in Addictive Behaviour at the Division of Psychological Medicine, Institute of Psychiatry, King's College London and research coordinator for the National Addiction Centre.
John's academic interests span a wide range of topics in psychology and psychiatry and he is an internationally recognised expert in the study of addiction with research expertise in epidemiology, biostatistics, psychometrics and clinical psychology.
John has appeared on a variety of news and TV programmes in the UK and is regularly sought for comment and opinion by the national news media.
Extending his media interests in 2001 John went on to present three seasons of BBC3's award-winning Body Hits, a documentary series on the science and culture of excess. Programmes included drug and alcohol misuse, body image, diet and exercise and detoxification diets.
The third Body Hits season was transmitted in the UK in June 2004.
John was the on-screen Consultant Psychologist on BBC1's Fat Nation series in September 2004. In 2005, he took part as the on-screen addiction expert in Sky One's Cocaine Nation.
He then presented BBC3's Exposed, a four part series about human behaviour with programmes on persuasion, deception, rejection and urban living, which was broadcast in January 2006.
In 2006 John co-presented the week-long live event Going Cold Turkey for C4, and for More4 the two-hour live special HypnoSurgery Live, which investigated the power of hypnosis in the operating theatre.
He also presented a one-off More4 event, Gunther von Hagens' Body Appeal, exploring the lack of human bodies for anatomy and surgery training in medical schools.
John also presented The E-generation at 40 for Radio 4.
In addition to his TV work, John writes a monthly health column and features for Esquire magazine.