Dr. Karim studied medicine at Cambridge University and Guy’s & St Thomas’ Hospitals, qualifying in 1993. He then trained at Guy’s under Dr Lawrence Youlten in Allergy, and at St Thomas’ under Prof Graham Hughes in Connective Tissue Diseases.
He was appointed as a Consultant Immunologist at Frimley Park and Guy's & St Thomas' Hospitals in 2004. Since late 2015, he has practised at Frimley Park Hospital and other hospitals in the Surrey area and has a broad clinical practice in Allergy, Autoimmunity and Immunodeficiency.
Dr. Karim has been a member of the British Society for Allergy and Clinical Immunology Council for several years, and the Chair of the Clinical Immunology Committee 2014-17 as well as being on the committee for the NICE Quality Standards on Drug Allergy in 2015.
Dr. Karim is also a lecturer at The University of Surrey, and King’s College London.