Jan Arnold Albert Ketelaar (21 April 1908, Amsterdam – 23 November 2001, Lochem) [1] [2] was a Dutch chemist and author of the textbook Chemical Constitution: an Introduction to the Theory of the Chemical Bond (De chemische binding. Inleiding in de theoretische chemie). [3] [4] Van Arkel–Ketelaar triangles are named after him. [5]
Ketelaar's doctoral students included Sol Kimel and Robert de Levie. [6] [7] He was elected a member of the Royal Netherlands Academy of Arts and Sciences in 1958. [1]