R. G. D. Allen
Sir Roy George Douglas Allen, CBE, FBA (3 June 1906 – 29 September 1983) was an English economist, mathematician and statistician, also member of the International Statistical Institute.He gained a First Class Honours in Mathematics, ranking top of his year as the Senior Wrangler.Allen was knighted in 1966 for his services to economics and became president of the Royal Statistical Society, who awarded him the Guy Medal in Gold in 1978.He introduced the concept of "partial elasticity of substitution" to economics in his 1938 book Mathematical Analysis for Economists.He had a son, Jeremy, who was a co-founder of the consultancy International Planning and Research, and a grandson, Dion.