is a Professor of Paediatric Allergy at Imperial College London. His professional training consisted of specialist training in pediatrics (1987-91), and successive appointments as Clinical Research Fellow and Specialist Registrar in Allergy (University Hospital of South Manchester, 1992-98). This period saw him awarded his M.Sc. (1991), M.D. with Gold Medal (1996) and Ph.D. (2000). He was promoted to a professorship at the University of Manchester in 2002, and moved to Imperial College in 2015.

In 2020, he was elected to the Fellowship of the UK Academy of Medical Sciences. In 2019, he was granted membership in the Academy of Sciences and Arts of Bosnia and Herzegovina (ANUBiH). In 2015 he was awarded a prestigious ERS Gold Medal for research in asthma. In 2013 he received the BSACI William Frankland Medal for outstanding contributions to clinical allergy in the UK and delivered numerous prestigious keynote lectures. He publisher more than 400 papers in peer-reviewed journals, with a current h-index of 105.

He serves at the Board of Directors of the World Allergy Organisation and has served as a Secretary of the BSACI for two terms, and as President of the asthma section of the EAACI. He served as the Associate Editor of the American Journal of Respiratory and Critical Care Medicine and has so far supervised 18 PhD/MD students to completion.