PhD MSc HFEA RCPCH MBBS MA(Cantab)
22 years of experience
London, W1G 0AR
20 connections in healthcare
Skill endorsed
by Dr Emily Derrick, Dr. Gary Stiefel and 7 other professionals
22 years of experience
London, W1G 0AR
20 connections in healthcare
Skill endorsed
by Dr Emily Derrick, Dr. Gary Stiefel and 7 other professionals
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Dr Tom Marrs is Consultant Paediatrician specialising in Allergy and Clinical Immunology, with two decades of experience in the treatment of children's allergies. Dr Marrs is Chair of the Paediatric Allergy Committee for the British Society of Allergy and Clinical Immunology (BSACI). He leads the Allergy Prevention Service at Guy's and St. Thomas' Hospital and the Joint Allergy-Gastroenterology Service at Evelina London. He led the Scientific Programme for the BSACI Conference from 2018-2020. Dr Marrs sees private patients at OneWelbeck Marylebone, next to Bond Street, north of Oxford Street.
Dr Marrs graduated from Clare College, Cambridge University, in Medicine, Medical Ethics and Law. He completed his primary medical qualification in 2003 from St Barts and the Royal London Hospital, after taking specialist study at the Astrid Lindgren's Children's Hospital, Karolinska Hospital, as well as studying in Sri Lanka and Nepal. Dr Marrs then undertook his specialist paediatrics training at various renowned London hospitals including the Royal Brompton, Great Ormond Street and Guy's Hospital. Since completing his training, Dr Marrs was awarded his PhD in eczema, food allergy and the prevention of food allergies, and has been appointed Director of the Allergy Academy, King's College London, where he is also a Senior Honorary Lecturer with Adjunct.
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General Medical Council
No. 6077957
University of London
Medicine
Graduated 2003
Education
PhD
MSc
HFEA
RCPCH
MBBS
MA(Cantab)
Memberships
Society of Allergy and Clinical Immunology (BSACI)
European Academy of Allergy and Clinical Immunology
Royal College of Paediatrics and Child Health
British Society of Allergy and Clinical Immunology
New appointment
£275Follow-up appointment
£2301 Welbeck St, Marylebone, London, London, United Kingdom, W1G 0AR
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This summary was created by AI based on recent reviews
Dr. Tom Marrs provides friendly, helpful, knowledgeable, and thorough interactions, ensuring patients feel comfortable and understand their care. He excels at paediatric consultation and allergy testing. Skin prick tests are easy, with Dr. Marrs offering clear explanations of results and detailed management plans for various food allergies and eczema. Patients praise his expertise for managing food allergies, easy skin prick tests, and dedicated paediatric consultations.
We went to Dr Marrs for an initial visit to check on our toddler's suspected milk allergy. Dr Marrs was very helpful, thoughtful, reassuring and addressed all our questions while simultaneously keeping our daughter engaged.
Lovely doctor really concerned about patient well being
This appointment was very helpful and Dr. Tom explained everything beforehand very well
He is sooo good 😊 he does the most less painful pinch if it hurts it’ll soon not hurt. He’s smart and talented but he’s also very funny 😁 If you’re here for eczema he’ll just talk make jokes give you the cream and then look 👀 at you’re eczema.
Recently had an appointment for my daughter with Dr Marrs. He built trust and great rapport with both myself and the patient from the onset. I felt heard as a parent, and received sufficient advice of further management. I appreciated his holistic approach - he reviewed more than my initial concerns about a possible allergy, and we agreed on further follow up plans. Genuinely the best experience we’ve had with a paediatrician so far. Would definitely book him again if needed in the future. Also appreciated being seen on time :)
Dr. Tom was very patient, empathetic and above all super helpful. We appreciate his help.
Dr Marrs explained the diagnosis and treatment options very clearly and patiently, giving us his full attention and serious consideration, to an extent few other doctors do. I am impressed.
The professionalism of the staff was excellent. Dr Marrs was very courteous and understanding, he showed our daughter his fun side to make her feel at ease to talk to him and would ask her questions about herself.
Tom is wonderful. He really gives you the time to ask all your questions. He is very good with babies. I would highly recommend him!

Dr Emily Derrick
PaediatricianTom is an excellent clinician with a patient centered approach and is extremely knowledgeable. He is aware of the latest research within allergy and actively involved in the British Society of Allergy Clinical Immunology. I would certainly recommend him and he will offer a fantastic service to your child.
07 Jun 2025
Dr. Gary Stiefel
PaediatricianTom is a great colleague, who I would be very happy to recommend for children needing food allergy testing.
11 May 2025
Dr. Bryan McDonald
DermatologistDr Marrs is an excellent allergy specialist. He is kind and approachable, as well as highly skilled. We share the care of young children with eczema and I very much value his expertise.
10 May 2024
Dr Victoria Swale
DermatologistWhat are Dr. Tom Marrs's reviews like?
Dr. Tom Marrs's overall patient rating is 4.97 out of 5 stars on Doctify. This is based on 228 reviews.
What languages does Dr. Tom Marrs speak?
Dr. Tom Marrs speaks English
Where is Dr. Tom Marrs located?
Dr. Tom Marrs primarily practices at Welbeck, located at 1 Welbeck St, Marylebone, London, London, United Kingdom, W1G 0AR
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Does Dr. Tom Marrs accept new patients?
Dr. Tom Marrs generally accepts new patients.
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