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| with Stephen Smale at Berkeley |
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| with Stephen Smale at Berkeley |
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| with Henri Cartan in Paris |
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| with Paul Erdős in Zurich |
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| with Paul Erdős in Zurich |
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| with Lars V. Ahlfors at Harvard |
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| with Jean Dieudonné in Paris |
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| with Garrett Birkhoff (1st row, first from the left), Andrew M. Gleason (2nd row, third from the left) and other mathematicians at Harvard |
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| with Vladimir I. Arnold in Paris |
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| with Serge Lang at Berkeley |
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| with Friedrich E.P. Hirzebruch in Bonn |
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| with Israel M. Gelfand (4th from the left) in London |
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| with Shizuo Kakutani at Yale |
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| with Jean Leray in Paris |
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| with Dirk Struik in Massachusetts, USA |
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| with Dirk Struik in Massachusetts, USA |
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| with Dragoslav S. Mitrinović (in the middle) and Gradimir V. Milovanović (right) in Belgrade |
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| with Josip Pečarić in Oberwolfach (MFO), Germany |
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| with Maxwell Reade in Ann Arbor, Michigan |
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| with his brother George M. Rassias (left) at U. C. Berkeley |
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| with Richard Järvinen in Ann Arbor, Michigan |
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| with A. D. Ioffe (left), J.-P. Penot (2nd from the right) and I. Chrysovergis (1st from the right) in Athens |
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| with Frank Deutsch in the island of Hydra, Greece |
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| with Bernd Wegner in Berlin |
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| with Joseph L. Ullman (left) and George Piranian (right) in Ann Arbor, Michigan |
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| with Preda Mihăilescu (right) at Goettingen |