MRCS 1862; LSA 1862; MD St Andrews 1880; FRCP 1890.
Mann was born in Kendal in 1840 or 1841 and was apprenticed to doctor Leeming in the town before gaining his medical education at Royal Manchester School of Medicine. After qualifying, Mann settled in general practice in Manchester. In 1882 he was appointed honorary physician to Salford Royal Hospital, a position he held until his death. He was lecturer in forensic medicine and toxicology at Owens College Manchester from 1885 and in 1892 his lectureship was changed to a chair in recognition of his important work. Mann represented the University of Manchester on the General Medical Council. Mann wrote a very successful textbook on forensic medicine and in 1899 was awarded the Swiney Prize. He was examiner in forensic medicine to the Universities of London, Oxford and Sheffield. Despite his wide regard as a forensic scientist, Mann avoided the law. Mann was president of MMS in 1894 and was also president of Manchester Pathological Society. He was chairman of the Manchester and Salford Sanitary Association for several years and an active member of Manchester Literary and Philosophical Society. Mann died of acute pneumonia at his Manchester home on 6 April 1912.