After completing his undergraduate degree in Medicine in Spain, Jon undertook clinical and academic training in Psychiatry in the Midlands. He also trained in Sexual Health, as well as in Psychotherapy, primarily Interpersonal, couple, and Systemic. Clinically he has worked primarily with young people with mental health difficulties and with those at risk of developing mental health problems. Jon was a Lecturer in Adolescent Psychiatry at Leicester University and moved to Nottingham to work clinically in the NHS as an adolescent psychiatrist, when he concluded his PhD. He then moved to the Leicester Eating Disorders Service, working closely with Loughborough University where he became a Visiting Professor. He has worked with various national sport and dance organizations, including the Royal Ballet at Covent Garden, developing policies for the prevention of mental health problems. During his training years he gained experience working at the Tavistock Gender Identity Development Service in London and he maintained his interest in the area of transgender health throughout his career. In 2014 he was appointed as clinician at the Nottingham National Centre for Transgender Health, where he works as a doctor. Jon became a Full Professor at Nottingham University in October 2016. Transgender health research has been neglected for many years, and it is hoped that Professor Arcelus’ new position will stimulate research in this field helping to improve the quality of life of transgender people in society, starting from the depathologisation of the diagnostic classification of Gender Dysphoria, followed by improving access to treatment and evidence based clinical services.