Richard Tecwyn Williams, Welsh biochemist (born 1909)

Richard Tecwyn Williams FRS was a Welsh biochemist who founded the systematic study of xenobiotic metabolism with the publication of his book Detoxication mechanisms in 1947. This seminal book built on his earlier work on the role of glucuronic acid in the metabolism of borneol.

December 29 is the 363rd day of the year in the Gregorian calendar; two days remain until the end of the year.