How did Max Planck respond to Adolf Hitler’s racial policies?

Max Planck, a man of profound integrity and moral force, took a direct and courageous stand against the Nazi regime's discriminatory actions. Recognizing the devastation caused by Adolf Hitler’s racial policies, Planck personally confronted Hitler in an attempt to reverse them.1

Despite the oppressive environment, Planck chose to remain in Germany throughout the Nazi period. His primary motivation for staying was to preserve what he could of German science and protect the academic community from the regime's destructive influence. His actions were consistent with his character, which was defined by a deep sense of fairness and wisdom that earned him immense respect among his peers.1