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Growing up during World War II; early interest in astronomy; undergraduate studies in Groningen, Holland. Graduate school, Rijksuniversiteit te Leiden (Pieter van Rhijn, Jan Oort and Hendrik van de Hulst); Ph.D., 1956. Carnegie Fellow at California Institute of Technology, 1956-1958; assistant professorship at Caltech, from 1959; comparison between Leiden and Caltech then and now; interest in star formation. Review of published papers and discussion of research interests.