Professor Jonathan Barker is a consultant dermatologist and a professor of medical dermatology at St John's Institute at Guy's and St Thomas' Hospital. He also sees patients privately, including at The London Bridge Hospital. Professor Barker runs a tertiary referral service for patients with psoriasis at Guy's Hospital, which won the BMJ Dermatology Team of the Year award in 2016. He specialises in psoriasis.

Professor Barker trained in London and the US and has been a consultant since 1991. He serves on several national and international boards, including the European Academy of Dermatology and Venereology and the International Psoriasis Council. His main research interests are inflammatory skin diseases, such as atopic dermatitis and acne vulgaris, with a primary focus on psoriasis. His work in psoriasis spans genetic discovery, pharmacogenetics, disease mechanisms like immunology, and clinical research.

Professor Barker has played a significant role in developing clinical guidelines for psoriasis in the UK and has published extensively on the subject, including authoring two books. He is also actively involved in postgraduate education.

Roles
- Consultant Dermatologist
- Professor of Medical Dermatology
- Member of national and international dermatology boards

Interests
- Genetic discovery in psoriasis
- Pharmacogenetics
- Disease mechanisms (immunology)
- Clinical research

Procedures and Conditions Treated
- Psoriasis

Professor Barker's extensive experience and dedication to dermatology make him a leading specialist in his field.