In 1897, Ehrlich enrolled in the Vienna University of Technology, just like his brother Đuro had a few years before.

After graduation from the university, Ehrlich stayed in Vienna, where he worked for Humbert Walcher.

During the Kovačić & Ehrlich collaboration, they designed several residential buildings and family houses.

[5] After the death of Viktor Kovačić in the autumn of 1924, Ehrlich took over construction work on the building of the Zagreb Stock Exchange (now Croatian National Bank) together with Alfred Albini and Stjepan Gomboš.

Beginning in 1925, Ehrlich worked as a professor at the University of Zagreb Faculty of Architecture.

During that time Ehrlich's studio became one of the largest studios in Zagreb, gathering the most talented generation of architects such as Alfred Albini, Stephen Gomboš, Mladen Kauzlarić, Juraj Denzler and Drago Galić.