Born in Basel, Switzerland, he studied zoology at the University of Basel and worked later in Geneva, Munich, Paris and Berlin, but mainly in marine biology laboratories in France (Banyuls-sur-Mer, Roscoff, Villefranche-sur-Mer) and Helgoland.
In 1949, Corbin first attended the annual Eranos Conferences in Ascona, Switzerland, where he was to become a major figure along with Carl Jung, Mircea Eliade, Gershom Scholem, Adolf Portmann and many others.
In 1956 Ritsema began to collaborate with Froebe and the Swiss zoologist and natural philosopher Adolf Portmann (1897–1982) in the planning of the Eranos Conferences.
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