Chaim L. Pekeris joined the Weizmann Institute as head of its Department of Applied Mathematics in 1949. He died in Rehovot, Israel on February 24, 1993. Chaim L. Pekeris Chaim Leib Pekeris (June 15, 1908 – February 24, 1993) was an Israeli-American physicist and mathematician. He made notable contributions to geophysics and the spectral theory of many-electron atoms, in particular the Helium atom. He was also one of the designers of the first computer in Israel, WEIZAC. Pekeris was born in Alytus, Vilna Governorate. With the assistance of his uncle, Pekeris and his two brothers emigrated to the United States around 1925. He
Chaim Weizmann in No. 502 Squadron RAF, he was killed when his plane was shot down over the Bay of Biscay in February 1942. His body was never found and he was listed as "missing". His father never fully accepted his death and made a provision in his will, in case he returned. He is one of the British Empire's air force casualties without a known grave commemorated at the Air Forces Memorial at Runnymede in Surrey, England. The elder son, Benjamin (Benjie) Weizmann (1907–1980), settled in Ireland and became a dairy farmer. His nephew Ezer Weizman, the son of his brother