Marine zoologist, born at Preston on 6 April 1866, the son of the Rev. Richard Allen (e.m. 1859; d.1901) was educated at Woodhouse Grove and Kingswood Schools and graduated in Chemistry and Physics at the Yorkshire College, Leeds in 1885. He served as the first headmaster of Coke College, Antigua before returning to engage in zoological research. From 1894 to 1936 he was director of the Marine Biological Association's laboratory at Plymouth during a period of financial and administrative problems, becoming also the Association's Secretary in 1895. Under his leadership the Association developed into a leading centre for marine research. He was made a CBE in 1935 and was awarded a DSc by the University of London and an LLD at Edinburgh. He continued active during retirement, dying in Plymouth on 7 December 1942.