Anastassis is a Psychologist, Systemic & Family Psychotherapist and registered Clinical Supervisor working therapeutically across the lifespan. He is based in London and in Athens and he is clinically active, both privately and in the National Health Service (NHS) in the UK and Greece.

He worked for four years at the Gender Identity Development Service at the Tavistock, in London, where he established and led the first Family Therapy & Consultation Service in the NHS for gender-questioning young people. He currently works at the Maudsley Centre for Child & Adolescent Eating Disorders (MCCAED) and independently. He often presents and teaches internationally on subjects related to gender identity, eating disorders, couple therapy, sexuality and systemic approaches to psychotherapy among others.

Anastassis holds an MSc and a PGCert (with distinction) in Systemic Family Therapy from the Institute of Psychiatry, Psychology & Neuroscience, King’s College London, an MSc in Psychology from Westminster University, an MSc in Organisational Management from Imperial College London and a BA in Communication from the National University of Athens. He has an additional PGCert in Systemic Family Therapy Supervision, Consultation and Teaching from the Tavistock Centre and offers supervision and consultation to other training and registered clinicians.

He is research active and is currently studying towards a PhD in Psychology – King’s College London, focusing on the relationship between early gender non-conformity and later-onset eating disorders. Anastassis is registered with the UK Council for Psychotherapy (UKCP), the British Psychological Society (BPS) and the Association for Family Therapy (AFT).

He has worked therapeutically with hundreds of gender-questioning and trans-identified young people and adults. He has also worked therapeutically with desisters in the NHS and privately, and with detransitioners in private practice and he believes both groups deserve better care.