Mádl then became the successor to Otakar Hostinsky, the lecturer on history of art, and was appointed full professor and administrator of the library.

In 1917, he was appointed vice-chairman of the Modern Art Gallery in Prague and was a member of the commission for the return of Bohemian scholars from abroad.

It incorporated formal analysis, archaeology, and emphasised precise determination of a work's author and time and place of origin.

Mádl's influence shaped new artistic commissions, such as the Jan Hus Memorial created by Ladislav Šaloun.

He began publishing an Overview of Art History from Antiquity to the Present, which was unfinished at the time of his death.