After receiving his medical degree, Michaelis worked as a private research assistant to Moritz Litten (1899–1902) and for Ernst Viktor von Leyden (1902–1906).
St. Moritz | Ernst Moritz Arndt | Moritz von Rohr | Moritz Richard Schomburgk | Johann Moritz Rugendas | Moritz von Jacobi | Moritz Steinschneider | Moritz Schiff | Moritz Pasch | Moritz Moszkowski | Moritz Michael Daffinger | Moritz Lewitt | Moritz, Landgrave of Hesse | Moritz Kaposi | Moritz Gottlieb Saphir | Moritz Eggert | Moritz College of Law | Michael Moritz | Max and Moritz | Hans Moritz von Brühl | Albert Moritz Wolff | Paulus Moritz | Moritz Wilhelm Wolf Freiherr von Beschwitz | Moritz Wagner | Moritz von Schwind | Moritz Schlick | Moritz Ludwig Frankenheim | Moritz Litten | Moritz Leuenberger | Moritz Lazarus |