Kees de Jager; op 92 jaar fervent hardloper, professor emeritus, sterrenkundige van wereld naam. Utrecht kende hem vooral als directeur van de sterrenwacht. Drie kwart eeuw verknocht aan de sterrenkunde in Utrecht. Een korte impressie van het leven van een beroemde Utrechter; "een pracht leven" zoals Kees de Jager zelf zegt

The paper presents an overview of C. de Jager's career and his achievements in space science and solar physics. His role as a European space leader and as one of the founders of ESRO and ESA is outlined. The international dimension of this outstanding scientist is illustrated through personal memories and a long-lasting friendship.

Interview met Kees de Jager (82), emeritus-hoogleraar ruimteonderzoek en astrofysica. Hij woonde veertig jaar in Sterrenwacht Sonnenborgh te Utrecht

Cornelis (“Kees”) de Jager, the co-founder of the journal Solar Physics, passed away on 27 May 2021. He was an exemplary human being, a great scientist, and he had a large impact on our field. In this tribute, we first briefly summarize his life and career and then describe some of his solar activities, from his Ph.D. thesis on the hydrogen lines in 1952 to the book on cycle–climate relations that he completed last year.