He then studied medicine at the Universities of Freiburg and Munich, where he earned his doctorate in 1914 (“Contributions to Basedow disease”).
In Munich, Mobitz was promoted to the position of a senior lecturer thanks to his research on heart block.
In 1928, after a 4-year tenure, he accepted a post in Freiburg as Associate Professor and Chief of Staff of the Clinic of Internal Medicine.
In 1924, Mobitz differentiated two types of second-degree AV block with the aid of the electrocardiogram and characterized their prognostic significance.
This form is identical to the previously described type of second-degree AV block by Wenckebach at the end of the nineteenth century.