Joost Manassen (Hebrew: יוסט מנסן; 17 February 1927 – October 2019) was a Dutch-Israeli chemist who was a professor at the faculty of chemistry of the Weizmann Institute of Science.
Sixma with a thesis titled, "Reactions of the n-butenes and 2-butanol in dilute acid solution : a mechanistic study".
[3] Manassen moved to Israel and started working for the Weizmann Institute of Science.
In the 1970s, after the 1973 oil crisis, Manassen worked on alternative energy based on solar power.
[4][5] Manassen was elected a corresponding member of the Royal Netherlands Academy of Arts and Sciences in 1986.