The title of his dissertation 1984 with Hans Primas and Norbert Straumann was Observable in der W*-algebraischen Quantenmechanik (observables in W*-algebraic quantum mechanics). In 1991 he earned Habilitation in Physical Chemistry at the ETH Zürich. From 1987 to 1995 he was a senior research associate at the Institute of Physical Chemistry at the ETH Zürich.
