De Broglie summarized his work in his doctoral thesis. It is said that his thesis examiners were unsure about giving it their blessing, so they sent it to Einstein for his opinion. [7] Einstein endorsed it, which got de Broglie his PhD, and also led Einstein to promote de Broglie's
idea. Erwin Schriodinger, who had already been working on the quantum theory of electrons in 1922 [8], was exposed to deBroglie's ideas through Einstein.