Thaddeus Birchard is the founder of the Marylebone Centre. He has an MSc in psychosexual therapy and a doctorate in the treatment of hypersexual disorders. He is accredited by the British Association for Behavioural and Cognitive Psychotherapies and is the founder of the Association for the Treatment of Sexual Addiction and Compulsivity. He is the author of CBT for Compulsive Sexual Behaviour : A Guide for Professionals and Overcoming Sexual Addiction : A Self-Help Guide (both Routledge).
Joanna Bonfield (MPhil) is a psychosexual therapist in private practice in London and France. She has a Diploma in Psychosexual and Relationship Therapy, and is a member of the British Association of Counsellors and Psychotherapists (BACP) and the College of Sexual and Relationship Therapists (COSRT).