David Seyfort Ruegg was born in 1931 and passed away 2 February 2021. After an initial training at SOAS and the University of Zürich (1948-1950), his university education was primarily in Paris, where he studied Indology under Jean Filliozat and Louis Renou and Tibetology under Marcelle Lalou and Rolf Stein. David Seyfort Ruegg’s work has ranged over most aspects of Indian and Tibetan Studies. However, two interests come back repeatedly: the philosophy of the buddha-nature (tathāgatagarbha) and the philosophy of the middle way (madhyamaka). David Seyfort Ruegg has held professorial positions in several major universities – Leiden, Seattle, Hamburg. He also was a visiting professor and lecturer at the University of Toronto (1972), State University of New York (1974), the School of Oriental and African Studies of the University of London (1987), as well as an invited professor at Collège de France, in Paris (1992), at the University of Vienna (1994), Kyōto University (1995), SOAS (1998) and Harvard University (2002). He was a Sanskritist and a Tibetologist and at one time or another has held chairs in Indian Philosophy, Buddhist Studies, and Tibetan.