In 1884, he was appointed professor of pathological anatomy at the Senkenbergsche Stiftung in Frankfurt am Main, and received the title of "Geheimer Medizinal-Rat" in 1899.

He is buried in Old Jewish Cemetery, Frankfurt (Juedischer Friedhof Rat-Beil-Straße).

[1] Weigert assisted Cohnheim in many of his researches, and wrote much on the staining of bacteria in microscopy.

[2] He is credited with the discovery of vascular tuberculosis, and was the first to demonstrate how tuberculous material could enter the bloodstream.

Among his works are: The Weigert-Meyer Rule describes the anatomic relationship of two ureters in a duplicated renal collecting system, as well as the resulting patterns of hydronephrosis, obstruction, and reflux.