Dr E. S. Moult, Ph.D., B.Sc, M.I.Mech.E., F.R.Ae.S.,chief engineer of the de Havilland Engine Co., Ltd.was concerned with aero-engine design from a time soon after the First World War, and in the inter-war years was associated with the late Major F. B. Halford in the design and development of such famous engines as the D.H.Gipsy and the Napier Rapier, Dagger and Sabre. He became chief engineer of the engineering departments of the de Hayilland engine and propeller divisions in 1941 and on the formation of the D.H. engine company in 1944 was appointed its chief engineer. He was a member of the Council of the R.Ae.S. in 1951-53. He became a director in 1955, and was technical director during 1957-62. In the latter year he was appointed technical director of Bristol Siddeley Engines Ltd, and became technical director of the Small Engine Division in 1962.