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Lionel Sharples Penrose
Lionel Sharples Penrose, was a noted British Psychiatrist and a pioneer in the field of mental retardation. He was the grandson of James Doyle Penrose of Carlow and Anne Bowles (Robert Bowles' daughter), the son of their son James Doyle Penrose (Jr.) who was a noted painter. Lionel's brother Sir Roland Algernon Penrose was an even more famous painter.
Lionel's three sons, Sir Roger, Oliver and Jonathan and a daughter Shirley are also noteworthy.
Note: the following information is from Wikipedia where further information on Lionel can be found at: http://en.wikipedia.org/wiki/Lionel_Penrose Please consider supporting Wikipedia or this link may not work one day!
Lionel Sharples Penrose, FRS (11 June 1898 – 12 May 1972) was a British psychiatrist, medical geneticist, mathematician and chess theorist, who carried out pioneering work on the genetics of mental retardation. He was educated at the Quaker Leighton Park School and St. John's College, Cambridge.
Penrose's "Colchester Survey" of 1938 was the earliest serious attempt to study the genetics of mental retardation. He found that the relatives of patients with severe mental retardation were usually unaffected but some of them were affected with similar severity to the original patient, whereas the relatives of patients with mild mental retardation tended mostly to have mild or borderline disability. Penrose went on to identify and study many of the genetic and chromosomal causes of mental retardation (then called mental deficiency). This body of work culminated in the book, The Biology of Mental Defect (Sidgwick and Jackson, Ltd., London, U.K., 1949).
Penrose was a central figure in British medical genetics following World War II. From 1945 to 1965 he occupied the Galton Chair at the Galton Laboratory at University College London. He received a number of awards and honors including the 1960 Albert Lasker Award for Basic Medical Research. The Lasker citation read: "Professor Penrose and his associates have been responsible over the years for studies which touch all aspects of human genetics, include genetic analyses of most of the known hereditary diseases, contributions to mathematical genetics, biochemical genetics, the study of gene linkage in man, and theoretical work on the mutagenic effect of ionizing radiations. Most recently their attention has been turned to abnormalities of human chromosomes associated with congenital defects, particularly mongolism (Down syndrome)."
In British psychiatry 'Penrose's Law' states that the population size of prisons and psychiatric hospitals are inversely related, although this is generally viewed as something of an oversimplification.
Penrose, a member of the Society of Friends (Quakers), was a lead figure in the Medical Association for the Prevention of War in the 1950s.
Penrose developed the Penrose method, a method for apportioning seats in a global assembly based on the square root of each nation's population. Such a voting system is based on the voting power of any voter (measured by the Penrose–Banzhaf index) decreasing with the size of the voting body as one over its square root.