 Jaspers received an extremely diverse and broad-ranging education. He initially enrolled as a student of law at the University of Heidelberg for three semesters (1901–1902). Despite his already vivid interest in philosophy, which he explored through Spinoza’s Ethics (1677) and Kant’s Critique of Pure Reason (1781),  he decided for medicine was based on his belief that it best illuminated life itself and the challenges of human existence. Jaspers began his medicine studies in Berlin (1902/1903), then moved to Gottingen (1903–1906), and eventually finished them in Heidelberg (1906–1908). He submitted his dissertation, Heimweh und Verbrechen in 1908 and graduated M.D. in 1909. He was a research assistant in the psychiatric clinic of the university of Heidelberg from 1909–1915, where he worked with some of the most famous psychiatrists in Germany, including Nissl, Wilmanned, Gruhle, and Mayer-Gross. Due to his illness with bronchiectasis, he was incapable of carrying out heavy duties in the clinic. The director of the psychiatric clinic of the university of Heidelberg, Franz Nissl, permitted him to spend the majority of his time at the library rather than in the clinic and the laboratory. Indeed, his extraordinary skills of critical thinking and abstract observation on human situations were evident already then. From 1913 onward, Jaspers read philosophy systematically. In 1913 he published his Allgemeine Psychopathologie (General Psychopathology) which already made apparent the viewpoints and methods that belong to the world of the humanities and social studies that were regarded by him as converging into psychopathology. In the same year, he obtained his second doctorate (Habilitation) in psychology from the Philosophy Faculty at the University of Heidelberg, supervised by Wilhelm Windelband. He was a lecturer and later an Associate Professor of Psychology (Privatdozent) from 1913 to 1921. During this period, in 1919, he published his Psychologie der Weltanschauungen (Psychology of World Views). This work is considered as a transitional work, in which his psychological method was clearly shaped by philosophical influences and objectives, and was already evolving into a consistent philosophical doctrine and acquiring some of the main issues that were to be explored later within his philosophy of existence. Then, in 1922, he took over the full professorial chair of philosophy in the University of Heidelberg (after Heinrich Maier), a position from which he was dismissed in 1937 by the Nazis. To a large extent, the two first major publications were works of psychology that contain many elements, albeit in inchoate form, of his later philosophy. Following his nomination as professor, he wrote nothing for ten years, except for two small works—a patholography Stirnberg and van Gogh in 1922 and Die Idee der Universität (The Idea of the University) in 1923.