Kees de Jager
Cornelis "Kees" de Jager (29 April 1921 – 27 May 2021) was a Dutch astronomer. He worked in predicting solar variation to see the Sun's impact on future climate. He was the General Secretary of the IAU from 1967 to 1973 and former director of the observatory at Utrecht. He was a fellow with the Committee for Skeptical Inquiry.