BMBS (Hons) MMedSc PGCert HBE MAcadMEd FHEA DFSEM (UK) MRCGP
London, SW1W8EE
1 connection in healthcare
London, SW1W8EE
1 connection in healthcare
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Dr Theo Criswell is a dedicated GP with a strong commitment to combining evidence-based medicine with a warm, patient-centred approach to care. As a fifth-generation doctor, he values building long-term relationships with patients and supporting individuals and families through every stage of life — from child health to later-life and palliative care.
He completed his medical training with Honours and Distinction, receiving a Dean’s Commendation for excellence in undergraduate medicine. Following this, he undertook broad postgraduate training at Frimley Park Hospital and St George’s Hospital, London, gaining experience across a wide range of medical specialties. He enjoys the full scope of general practice, with particular interests in preventative medicine, musculoskeletal health, mental health, and sexual health.
Alongside his clinical work, Dr Criswell has a strong interest in medical education and research. He holds a Master’s degree in Medical Sciences and has published research in neuropathology. He also completed a postgraduate qualification in Medical Education and is a Fellow of Advance HE and a member of the Academy of Medical Educators. He continues to teach medical students as a tutor at City St George’s, University of London.
Dr Criswell also holds a Diploma in Musculoskeletal Medicine and is a Fellow of the Faculty of Sport and Exercise Medicine. He regularly works with medical teams at sporting events, with a particular interest in endurance sports.
Outside medicine, Theo enjoys music, tennis, golf and skiing, and lives in South London with his family.
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The Academy of Medical Educators
Royal College of General Practitioners
Faculty of Sports and Exercise Medicine (FSEM)
General Medical Council
No. 7603580
6B Sloane Square, London, United Kingdom, SW1W8EE
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This summary was created by AI based on recent reviews
Dr Theo Criswell is thorough, kind, knowledgeable in his approach to patient care. He provides clarity when explaining diagnoses and treatment plans, ensuring patients feel understood and confident about their medical pathway. Patients find him reassuring and supportive, appreciating his efficiency in organising referrals and investigations. His practice features a strong emphasis on health assessments and general health screenings.
Dr Theo Criswell is extremely thorough, professional & he is very easy to talk to. He sent me to an excellent consultant.
Dr Theo Criswell was brilliant at explaining everything and a very clear and compassionate communicator whilst also clearly laying out a plan for future treatment and options.
I really like Theo's calm & considerate approach to medical issues. He thinks before he speaks, and if he speaks he says things that matter and address the specific question. During a consult he creates a private and intimate atmosphere, where you feel being in the centre of his attention. His feedback is quick and efficient, as is his supporting team. I feel blessed being his patient.
Dr Theo Criswell is a fantastic doctor. He is thorough, calm and always takes the time to explain everything clearly, no matter what we may be discussing. I always leave his office feeling completely clear on the issue at hand and reassured that anything I am concerned about will be dealt with carefully and with ease. I would strongly recommend him as a doctor and feel very grateful to have been treated by the Criswell's over many years.
I am impressed by Dr Theo’s professionalism and the care he takes and his interest in me as a patient. I have one reservation. He referred me to a consultant and following that referral I have had a plethora of tests required by the consultant and recently I have not understood why more testing continues. Ok perhaps my failure to ask relevant questions at the right time. However, here I perceive a communication gap in my current circumstances between Dr Theo and me. Perhaps I was naive in my expectations.
Dr Theo Criswell recently carried out a medical for me and has also been incredibly helpful in putting together various medical plans and thinking through different options with me. What has stood out most is the amount of time and care he gives. He explains everything so thoroughly, never makes me feel rushed, and I always come away feeling listened to and completely clear about the plan. It feels genuinely unusual to receive this level of attention and continuity from a GP, and it has been such a different experience from healthcare I’ve received elsewhere. I’m incredibly grateful to have found him and wouldn’t hesitate to recommend him.
Excellent on all counts. Particularly thorough. Unrushed. Courteous. Knowledgeable. Highly recommend. 5*
I saw Dr. Criswell for a routine health check, bloods, PSA, cholesterol etc. He could not have been kinder or more empathetic. Carefully went through all the results and explained the readings in lay terms, their significance together with likely future predictions. He was very thorough. Great medical experience and I feel that I am in very good hands.
I cannot recommend Dr Theo Criswell highly enough. From the moment I saw him, he made what had been a worrying and confusing situation feel manageable. His knowledge is exceptional, and he diagnosed my condition almost immediately after others had struggled to identify the cause of my symptoms. He took the time to explain everything clearly and calmly, ensuring I understood both the diagnosis and the treatment plan. I never felt rushed, and his kindness, empathy and reassurance made an enormous difference at a very difficult time. What also stood out was the speed with which he organised referrals and investigations. Everything was dealt with efficiently, giving me confidence that I was in the very best hands. Dr Criswell combines outstanding clinical expertise with genuine compassion. He is an exceptional doctor, and I feel incredibly fortunate to have been under his care.
Dr Theo gets right to the root of the problem and does not give up on a difficult case: chasing down every symptom until a solution is found. You could not find a more conscientious doctor.

What are Dr Theo Criswell's reviews like?
Dr Theo Criswell's overall patient rating is 5 out of 5 stars on Doctify. This is based on 46 reviews.
What languages does Dr Theo Criswell speak?
Dr Theo Criswell speaks English
Where is Dr Theo Criswell located?
Dr Theo Criswell primarily practices at The Criswell Practice, located at 6B Sloane Square, London, United Kingdom, SW1W8EE
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What are Dr Theo Criswell working hours?
Dr Theo Criswell is working Monday (08:30 - 17:00), Tuesday (08:30 - 17:00), Wednesday (08:30 - 17:00), Thursday (08:30 - 17:00), Friday (08:30 - 17:00)
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Does Dr Theo Criswell accept new patients?
Dr Theo Criswell generally accepts new patients.
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