Born in Fiji, he graduated in medicine from
University of Otago (New Zealand) in 1963 and completed residency at
Auckland Hospital, followed by a cardiology fellowship at
Green Lane Hospital. In 1969, Singh was awarded a Nuffield travelling fellowship and moved to Oxford to work with
Miles Vaughan Williams. There, he worked on the anti-arrhythmic properties of drugs including
amiodarone. Such work helped to refine the characteristics of Class III compounds in the developing
Vaughan Williams classification. ==Career==