Professor Margaret Johnson is one of the leading consultants in Thoracic medicine, practicing at the Royal Free London NHS Foundation Trust and the Hospital of St John & St Elizabeth. She trained at the Brompton Hospital where she did her MD from the University of London on Breathlessness.

Her main areas of interest include respiratory infection, asthma, chronic cough, breathlessness, bronchiectasis, COPD, allergy, lung cancer, sleep apnoea, including pneumonia, TB, HIV and management of Long Covid.

Professor Margaret Johnson is active in cutting edge clinical research in the field of respiratory infection, TB and HIV.  She as published in excess of 600 articles in peer reviewed journals.  She was made Professor of Medicine at University College London in 2005.

She has held many senior positions in Medicine including Medical Director of the Royal Free, Chairman of the British HIV Association and Academic Vice President of the Royal College of Physicians.  She is currently Clinical Director of the National Institute Health Research North Thames Clinical Research Network and Deputy Chairman of St John & St Elizabeth Hospital.