This diploma thesis written at the department of Kunstgeschichte, Bauforschung und Denkmalpflege reflects and interprets the life and work of the Austrian architect Michael (Michel) Engelhart (1897-1969). His father Josef Engelhart (1864-1941) was an artist and co-founder of the Secession in Vienna. While Michael Engelhart-s collection of work as an architect is huge, the main focus of this thesis relies on his work in the post-war period. Together with Erich Boltenstern (1896-1991) and Otto Niedermoser (1903-1976) he is one of the most important architects of Vienna-s reconstruction after the Second World War. Rebuilding the destroyed Burgtheater is Engelhart-s most famous project. Furthermore, another focus lies on Engelhart-s work in the Tiergarten Schönbrunn regarding the reconstruction and expansion of the zoo. Also,in this thesis the architect-s work is going to be classified according to the architectural discourse of the immediate post-war period. Moreover, another important aspect of this thesis is not only the private and professional background of the Viennese architect, but also his function at the former TH Vienna, now Vienna University of Technology, which includes his job as an assistent from 1924-1930 and from 1946 until his retirement in 1960 the professorship of Baukunst, Entwerfen and Denkmalpflege and dean at the TH Vienna from 1957 to 1958. The main source of this diploma thesis is Michel Engelhart-s inheritance at the archives of the TU Wien. Other significant documents are taken from the archives of Tiergarten Schönbrunn.