Karl Marx | Otto von Bismarck | Friedrich Nietzsche | Friedrich Schiller | Friedrich Engels | Karl Pilkington | Karl Lagerfeld | Otto | Karl G. Heider | Carl Friedrich Gauss | Karl Rove | Karl Pearson | Karl May | Karl Liebknecht | Karl Friedrich Schinkel | Karl Dönitz | Karl Jenkins | Friedrich Dürrenmatt | Otto III | Otto Piene | Otto I, Holy Roman Emperor | Otto I | Friedrich Hayek | Caspar David Friedrich | Karl Stefanovic | Otto Preminger | Georg Wilhelm Friedrich Hegel | Friedrich Hölderlin | Friedrich Gustav Jakob Henle | Karl Bodmer |
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).