He was invited to address the International Congress of Mathematicians held in Edinburgh in 1958 and was elected to the American Academy of Arts and Sciences in 1966.
[3] During the difficult years after the Second World War, Matsusaka worked on several problems connected with Weil's Foundations of Algebraic Geometry.
This led to a correspondence and eventually Weil invited Matsusaka to the University of Chicago (1954–57) where they became life-long friends.
After three years at Northwestern University and a year at the Institute for Advanced Study,[4] Princeton, he went to Brandeis University in 1961 where he stayed until 1994, helping to build the department to its current prominence.
[2] Matsusaka was awarded a Guggenheim Fellowship for the academic year 1959–1960.