Born in Vienna 1956 into the family of art collectors and museum founders Rudolf and Elisabeth Leopold, Diethard Leopold studied German Literature, Christian Theology and Psychology. He taught at Austrian and Japanese universities. Later on he became a Psychotherapist of the Gestalttherapy-school. He also works as a trainer for traditional Japanese archery, Kyudo, and Zen meditation.
For the Leopold Museum he curated the Vienna 1900 permanent presentations from 2008-2019 and several of its world-famous Egon Schiele presentations among other special exhibitions like on Richard Gerstl recently. For the Musem of Applied Arts he curated a Shunga exhibition / erotic Japanese woodblock-prints. He also wrote extensively on these subjects.