KAREL CUYPERS (1907-1986) was born in Antwerp. He became an astronomer, but also published on educational and philosophical topics. His pedagogical view was that pupils should above all learn the method of thinking rather than accumulating facts. Initially a freemason and open-minded atheist, in 1951 he became one of the founders of the Belgian Humanist League. From 1955 to 1965 he was its president. He was a member of the IHEU Board of Directors from 1952 to 1975.