Dagan Lonsdale is a senior lecturer in clinical pharmacology and therapeutics and consultant intensive care physician. 

He is a lecturer and pharmacokinetics module lead for St George's BSc in Clinical Pharmacology. Other education roles include MB BS lecturer and examiner. 

Dagan's research interests are in drug pharmacokinetics in critical illness. He holds a PhD in pharmacokinetic modelling. ABDose, the prospective study that formed the basis of his PhD is the first critical illness pharmacokinetic study to include neonates, children and adults, with an age range of 1 day to 90 years. 

Clinically, Dagan is an intensive care physician working in St George's Hospitals NHS Foundation Trust. His clinical training was undertaken at St George's, Guy's and St Thomas' and The Royal Brisbane and Women's hospital, Australia.