MB ChB Manch 1967; MRCP Eng 1970; MRCPath 1975, FRCPath 1987.
Lewis was born in Birmingham on 30 July 1944. After studying medicine at the University of Manchester, Lewis held junior appointments at Withington Hospital Manchester, Royal Lancaster Infirmary and Stepping Hill Hospital, Stockport. He was senior registrar in haematology at the Children's Hospital Birmingham, General Hospital Birmingham and University College Hospital, Ibadan, Nigeria. Lewis was later appointed consultant haematologist to North Manchester General Hospital.