Yes, John von Neumann did meet Albert Einstein on multiple occasions. Both Neumann and Einstein were renowned scientists and intellectuals of their time, and their paths crossed in various academic and social circles.
Von Neumann had a great admiration for Einstein's work and contributions to physics. He recognized Einstein as a pioneering figure in the field, particularly for his theory of relativity. Von Neumann was known for his deep appreciation of Einstein's intellect and often praised his ideas.
Einstein's theories had a significant impact on von Neumann's own thinking, particularly in the areas of quantum mechanics and the philosophical implications of relativity. Von Neumann engaged with Einstein's concepts, and their discussions and interactions influenced his own work in mathematics, physics, and game theory.
Overall, von Neumann held Einstein's work in high regard and considered him one of the greatest minds in the field of physics. Their meetings and exchanges likely played a role in shaping von Neumann's thinking and contributed to his own remarkable contributions to science and mathematics.