von Neumann gave a mathematically rigorous treatment of QM, synthesizing the work by physicists that had previously gotten a confused reaction from mathematicia

von Neumann gave a mathematically rigorous treatment of QM, synthesizing the work by physicists that had previously gotten a confused reaction from mathematicians. In that way he explained QM and also made a mathematical platform for others to build on. It was absolutely brilliant work. But I think he didn't exactly advance QM. He took the physics version that made mathematicians say wtf, and created a mathematician version that made physicists say wtf. I think physicists mostly used Dirac's book "The Principles of QM" (1930), which went through 5 or 6 later editions and may still be in print.