Sir John Graham Kerr (18 September 1869 – 21 April 1957), known to his friends as Graham Kerr, was a British embryologist and Unionist Member of Parliament (MP). He is best known for his studies of the embryology of lungfishes. He was involved in ship camouflage in the First World War, and through his pupil Hugh B. Cott influenced military camouflage thinking in the Second World War also. Early life He was born at Rowley Lodge, in Arkley in Hertfordshire, to Scottish parents: James Kerr, former Principal of Hooghly College in Calcutta, and his wife, Sybella Graham. Kerr was educated at the Royal High School, Edinburgh, and then studied medicine at the University of Edinburgh. Zoology Kerr interrupted his medical studies to join an Argentinian expedition to study the natural history of the Pilcomayo River. On his return, he studied natural sciences at Christ's College, Cambridge, graduating with first class honours in 1896. The Argentinian expedition had ended with the loss of most of the collections, but after graduating he mounted an expedition to the Gran Chaco, bringing home a large collection of material related to the South American lungfish, Lepidosiren paradoxa. Kerr was accompanied by John Samuel Budgett, who studied the frogs of the area and discovered a new genus. After a period acting as Demonstrator in the Animal Morphology lectures at Christ's College, Cambridge (1898 to 1902), he was appointed in August 1902 as Regius Professor of Natural History in the University of Glasgow replacing John Young. Kerr stayed until 1935 when he was succeeded by Prof Edward Hindle. Kerr was particularly interested in teaching medical students, and published widely. In 1903, he was elected a Fellow of the Royal Society of Edinburgh. His proposers were Sir Isaac Bayley Balfour, James Cossar Ewart, Frederick Orpen Bower, and James Geikie. He won the Society's Neill Prize in 1904. He served as the Society's Vice President from 1928 to 1931. He was President of the Royal Physical Society of Edinburgh from 1906 to 1909, and elected a Fellow of the Royal Society in 1909. He received LLDs from the University of Edinburgh in 1935 and the University of St Andrews in 1950. Camouflage Kerr made early contributions to ship camouflage in the First World War. He wrote to First Sea Lord Winston Churchill on 24 September 1914, advocating camouflage by disruptive coloration — breaking up outlines with patches of strongly