Jack Nathan is a consultant psychotherapist at the Maudsley Psychotherapy Service and Self-Harm Out Patients' Service (SHOPS) and also Senior Lecturer in social work at the Institute of Psychiatry.

Formerly a social work manager at the Maudsley Hospital, he then trained as an adult psychotherapist at the London Centre for Psychotherapy. He went onto specialise in work with borderline personality disordered patients, in particular those who self-harm.

He is particularly interested in how to work with a patient group once openly referred to as 'the patients psychiatrists dislike', what countertransference difficulties they arouse and the meaning attached to their self-destructive behaviours. He is author of Self-harm: a strategy for survival and nodal point of change (2006).