Our support team

Dr Helen Brough
Founder – Consultant in Paediatric Allergy & Immunology

Dr Brough is a Consultant in Paediatric Allergy and Clinical Immunology and the founder of Children’s Allergy Doctors. She has specific interests in food allergy prevention, diagnosis and treatment, immunotherapy, asthma, eosinophilic gastrointestinal disorders and eczema. 

Dr Brough was awarded ‘Health Professional of the Year’ in 2010 by Coeliac UK, the Barry Kay award for excellence in Paediatric Allergy research from the British Society for Allergy and Clinical Immunology in 2013 and the Distinguished Clinician Award from the American Academy of Allergy and Clinical Immunology in 2020.


Dr Erika Harnik
Consultant in Paediatric Allergy & Immunology

Erika is a Consultant in Paediatric Allergy & Immunology (to start at Imperial College London). She trained in Paediatric Allergy at the Evelina Children’s Hospital, St. Mary’s hospital, Royal Free Hospital and Great Ormond Street Hospital. She received a distinction in her Master of Sciences degree in Paediatric Allergy from the University of Southampton. She is an excellent, thorough and dedicated doctor with a wealth of experience and excellent rapport with parents and patients alike.

Dr Andreina Marques Mejias
Medical Associate
Specialist Doctor in Paediatric Allergy

Dr Andreina Marques Mejias is an Allergist trained in Hospital Universitario La Paz in Madrid with a PhD from Universidad Autónoma de Madrid. After completing her training, she moved to London, where she has been working in the Paediatric allergy department at Evelina Children’s Hospital. She has a special focus on paediatric allergy research as a co-investigator of prevention, diagnosis, and food allergy treatment trials. Dr Marques Mejias speaks Spanish, English and Portuguese.

Louise Cameron
Clinical Nurse Specialist

Louise is a clinical nurse specialist at Children’s Allergy Doctors and at the Portland Hospital where she runs the day unit service for oral food, drug and latex challenges. Her training took place at Great Ormond Street hospital with South Bank University, where she achieved a BSC in Children’s Nursing. Prior to moving into the speciality of allergy, she worked on a variety of wards including Accident & Emergency. She is a kind and caring nurse who always has time for patient and their families.

Hannah Smyth
Clinical Nurse Specialist

Hannah is a clinical nurse specialist at Children’s Allergy Doctors. Hannah graduated from King’s College London with a BSc in Children’s Nursing. Since qualifying, she has spent time working on various general paediatric areas; gaining experience caring for atopic children throughout. She has experience in doing allergy testing, parent and child education, respiratory function testing, food challenges, immunotherapy, and drug provocation testing. She is a compassionate nurse who puts patients and families first.

Melanie Davies
Clinical Nurse Specialist

Melanie is a clinical nurse specialist at Children’s Allergy Doctors and at the Portland Hospital where she runs the day unit service for oral food, drug and latex challenges. After graduating from the University of Hertfordshire in 2009, Melanie commenced her nursing career at King’s College Hospital. Having worked in Accident & Emergency, paediatric neurosurgical and the children’s’ day unit, she started working in Paediatric Allergy in 2014. She is a very experienced nurse who knows how to put parents and their families at ease.

Tracy Kennedy
Practice Manager

Tracy is our Practice Manager with over 30 years of management experience. Tracy originally qualified as a nurse at University College Hospital, London where she staffed for several years. Tracy then trained and qualified as a Medical Secretary and worked for many years in private practice management. Tracy manages all areas of the practice including billing and practice development.

Tracy enjoys providing an excellent, friendly service to every patient and contributes to the quality of care. She is happy to assist you in any of your child’s needs and looks forward to speaking to you.

Kelly Clear
Medical Secretary

Kelly is our Medical Secretary and has an MSc in Health Psychology. Kelly joined the team in July 2021. With over ten years’ experience in private practice, Kelly is dedicated to making your journey at Children’s Allergy Doctors a smooth and enjoyable process.


Chloe Leopard
Medical Secretary

Chloe is our medical secretary and has worked in the NHS since 2016 working in various specialties including Respiratory Medicine, Mental Health, and Primary Care services. Chloe has been working in the private medical sector since the beginning of this year which she enjoys.  Chloe is helpful and always willing to assist with any queries.



Medical Secretary/PA to Dr Helen Brough

Kimberley is our Medical Secretary / PA who looks after the Immunology treatments and pathology accounts with 14 years’ experience working within the NHS and private GP practice sector including departments such as Paediatrics, Child and Adolescent Mental Health and Safeguarding Children. She holds an Advanced Diploma for Medical Secretaries and Advanced Level 3 in Business Administration. Kimberley is always happy to assist with any queries.


Simone Castle

Medical Secretary/Audio Typist

Simone is a very experienced medical secretary/PA who has over 30 years’ experience mostly working in private practice and the NHS.  Simone joined the practice in 2021 and is always happy to assist with enquiries.