Thorbergur Thorvaldson, "TT," cement chemist (b in Iceland 24 Aug 1883; d at Saskatoon 4 Oct 1965). Settling with his parents near Gimli, Man, he went on to attend U Man and Harvard (MSc, PhD). In 1919 he became head of the dept of chemistry at U Sask, and in 1945 the first dean of graduate studies. He was made a Knight in the Icelandic Order of the Falcon in 1939 and was president of the Canadian Inst of Chemistry in 1941. His research on the chemistry of cement and the development of cements resistant to deterioration through chemical attack won him international recognition and many honours. Thorvaldson Lake in northeastern Saskatchewan was named after him in 1966 - a rare honour for a chemist.