Dr. Youlten is Visiting Consultant in the Department of Allergy at Addenbrooke's Hospital, Cambridge, Consultant and Medical Director the London Allergy Clinic, Fellow of the Royal College of Physicians of Edinburgh, a Fellow of the Faculty of Pharmaceutical Medicine of the Royal College of Physicians and Doctor of Philosophy of London University.

Lawrence Youlten was a medical graduate at Guy's Hospital, University of London. He was then appointed as a lecturer in the Sherrington School of Physiology at St. Thomas's Hospital Medical School and went on to become a senior lecturer in the Physiology department of the London Hospital Medical College, where he was awarded a PhD for his work on Vascular Permeability. This was followed by his appointment as senior lecturer in the Pharmacology Department of the Institute of Basic Medical Sciences at the Royal College of Surgeons where he was involved in basic research into physiology and pharmacology of vascular response to inflammation. Between 1979 and 1992, he combined clinical work in allergy and asthma with a position in Clinical Pharmacology Department of Beecham (later Smithkline Beecham). In 1989 he was appointed Director of Clinical Pharmacology Compliance, SmithKline Beecham Pharmaceuticals where he was responsible for Phase 1 and early Phase 2 studies of candidate drugs in the areas of asthma, allergy, thrombosis, diabetes, obesity and related metabolic diseases. From 1977 to 1997 he was a consultant in the Allergy Department at Guy's Hospital, London.

He is a former member of Council and Secretary of British Society of Allergy and Clinical Immunology. He has particular interest in rhinitis and asthma and in anaphylaxis and related problems, including drug related anaphylaxis and insect venom allergy. He has published approximately 60 papers on scientific and medical topics mainly referring to allergy and its fundamental mechanisms.