Ibler was born in Zagreb and he earned a diploma in architecture at the Technische Hochschule in Dresden, Germany.
He then studied from 1922 to 1924 at the Staatliche Kunstakademie in Berlin, in the studio of German architect Hans Poelzig which influenced his work during 1920s.
His work was responsible for introducing ribbon windows and other elements of Le Corbusier's architecture to Yugoslavia.
[3] In 1926, Drago Ibler became a professor of architecture at the Zagreb Academy of Fine Arts.
He designed many more buildings in Zagreb, including several residential blocks and a residence for Tito.