He is the author of the e-book Gray's Global Medicines Development (formerly Gray's Drug Development), updated annually and hyperlinked to regulatory guidelines. He studied medicine in the UK , obtaining a BA with first class honours from Oxford University in 1978 and MBBS from the University of London in 1981. He subsequently undertook training in internal medicine, clinicalpharmacology and neurology obtaining the Membership of the Royal College of Physicians (UK) in 1984 and a D.Phil (PhD) in neuropharmacology from Oxford University in 1988.