In 1994, he was an invited speaker of the International Congress of Mathematicians in Zürich (The algebra of functional analysis). with Ken Dykema, Tadeusz Figiel, Gary Weiss: Commutator structure of operator ideals.
1994 war er eingeladener Sprecher auf dem Internationalen Mathematikerkongress in Zürich (The algebra of functional analysis). mit Ken Dykema, Tadeusz Figiel, Gary Weiss: Commutator structure of operator ideals.