Professor John Pasi


Medical interests: Haemostasis and thrombosis, inherited clotting disorders, von Willebrand disease, haemophilia.



As a haematologist specialising in haemostasis and thrombosis I am concerned with patients whose blood either clots too readily, resulting in venous thromboembolic disease, or not readily enough, causing bleeding disorders. I have a particular clinical interest in thrombosis, which can be due to an inherited condition or that results from age-related and chronic disease-related changes during later life. I also see patients with a variety of bleeding problems including genetic conditions such as von Willebrand disease and haemophilia. I am keen to promote good practice in haematology so that patients everywhere can get the best possible care, so have helped to develop various national guidelines concerned with how haemostatic and thrombotic disorders should be optimally treated.

Medical training

Professor John Pasi graduated in medicine from the University of Birmingham in 1983 and did his first specialist training in haematology at Birmingham Children’s Hospital. He was awarded a PhD for his research work there. In 1993 he was appointed as Consultant Haematologist and Honorary Senior Lecturer at the Royal Free Hospital and School of Medicine, where he remained until 1999. He was then appointed Professor of Haematology at the University of Leicester, as well as Head of Haematology Services at the University Hospitals of Leicester NHS Trust.

Current appointments

Professor Pasi has been Professor of Haemostasis and Thrombosis and a Consultant Haematologist at Barts and the London since 2003. He is Director of the Haemophilia Centre at the Royal London Hospital and the North London Haemophilia Network and is also co-chair of the UK Thromboprophylaxis Forum and a member of the Department of Health VTE advisory Group. He is active in teaching and is an examiner for the Royal College of Pathologists. His research interests are focused on developing new therapies for patients with haemophilia and von Willebrand disease.

NHS practice

Consultant Haematologist at Barts Health NHS Trust.


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