Staff A-Z

We have a passionate and committed staff dedicated to caring for the children at Great Ormond Street Hospital. To find out more about a member of staff, their clinical specialty or to contact them, please use the search below.

Martin Kostolny

Mr Martin Kostolny trained at the Heart Centre in Bratislava, Slovakia under Prof. Hraska and at the German Heart Centre Munich, Germany under Prof. Lange. In 2003 he spent a year as senior registrar at GOSH with Prof. deLeval, Prof. Tsang and Prof. Elliott.

Jon Goldin

Dr Jon Goldin is a Consultant Child and Adolescent Psychiatrist. He has worked at Great Ormond Street Hospital (GOSH) since 2002 as Head of the Mildred Creak Unit.

Gwynneth Down

Dr Gwynneth Down is a Consultant Family Psychotherapist. She is the Head of Family Psychotherapy across the Department of Child and Adolescent Mental Health and Psychosocial Services.

Dasha Nicholls

Dr Dasha Nicholls is an expert in feeding and eating disorders. She first started working at Great Ormond Street Hospital in 1995. She is Consultant Child and Adolescent Psychiatrist and Joint Head of the Feeding and Eating Disorders Service and Honorary Senior Lecturer at the Institute of Child Health, University College London. She is currently clinical lead for the Eating Disorders Team.

Helen Ritzema

Dr Helen Ritzema is a Consultant Child and Adolescent Psychotherapist within the Parenting and Child Service in the Department of Child and Adolescent Mental Health at Great Ormond Street Hospital. She has worked at GOSH since 2013.