Nobel Lecture, June 2, 1920 The genesis and present state of development of the quantum theory If i take it correctly that the duty imposed upon me today is to give a public lecture on my writings, then i believe that this task, the importance of which i am well aware through the gratitude felt towards the noble-minded founder of our Foundation, cannot be more suitably fulfilled than by my trying to give you the story of the origin of the quantum theory in broad outlines and to couple with this, a picture in a small frame of the development of this theory up