Friedrich Nietzsche | Friedrich Schiller | Friedrich Engels | Carl Friedrich Gauss | Karl Friedrich Schinkel | Friedrich Dürrenmatt | Friedrich Hayek | Caspar David Friedrich | Georg Wilhelm Friedrich Hegel | Friedrich Hölderlin | Friedrich Gustav Jakob Henle | Friedrich Ebert | Friedrich Wilhelm Joseph Schelling | Karl Wilhelm Friedrich Schlegel | Friedrich Gulda | Friedrich Rückert | Friedrich Paulus | Johann Friedrich Böttger | Friedrich von Huene | Friedrich List | Friedrich | Christian Heinrich Friedrich Peters | Johann Friedrich Blumenbach | Friedrich Wilhelm Freiherr von Bülow | Friedrich Specht | Friedrich Schleiermacher | Friedrich Schlegel | Friedrich Karl Dörner | Friedrich Fröbel | Friedrich de la Motte Fouqué |
After graduating with a B.A. from Harvard in 1878, Sachs travelled to Europe and studied under some of the more prominent physicians of the time, such as Adolf Kussmaul (1822–1902), Friedrich Daniel von Recklinghausen (1833–1910), Friedrich Goltz (1834–1902), Rudolf Virchow (1821–1902), Karl Friedrich Otto Westphal (1833–1890), Theodor Meynert (1833–1892), Jean-Martin Charcot (1825–1893), and John Hughlings Jackson (1835–1911).
The stimulation of the surface of the cerebral cortex by using brain stimulation was used to investigate the motor cortex in animals by researchers such as Eduard Hitzig (1838–1907), Gustav Fritsch (1838–1927), David Ferrier (1842–1928) and Friedrich Goltz (1834–1902).