accepted by 1932. In 1929 he became professor at the University of Amsterdam, publishing over 200 papers until his retirement in 1952.In 1928 he became correspondent of the Royal Netherlands Academy of Arts and Sciences, he resigned a year later. In 1936 he became a full member. Clay died on 31 December 1955 in De Bilt

Personal life

Clay met and fell in love with Tettje Jolles,

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