  Just as the early Mach was influenced by the revolutions in psychology and biology, the mature Mach was deeply involved in the revolutions in physics, though remaining a critic of the new physics just as much as he had been of the old. Both Planck and Einstein paid their homage to the person who created a culture of critique within which they developed their ideas. They also came to criticize what they saw as his stubborn refusal to accept their new ideas.