The notion of independence in noncommutative probability, free, monotone, and boolean independence and convolutions
Quantum stochastic processes with independent and stationary increments (quantum Lévy processes)
Compact and locally compact quantum groups, probability on quantum groups
Dual groups, probability on dual groups
Quantum stochastic calculus, Wigner functions, regularity of solutions of quantum stochastic differential equations, and applications to physics (quantum Malliavin calculus)
Co-organised the conference "Compact Quantum Groups" at the Alfried Krupp Wissenschaftskolleg Greifswald, Germany, with Malte Gerhold, Adam Skalski and Moritz Weber, July 11-15, 2016
Co-organized a conference and school on Product Systems and Independence in Quantum Dynamics at the Alfried Krupp Wissenschaftskolleg Greifswald with Volkmar Liebscher, Michael Schürmann and Michael Skeide, 7 - 18 March 2011.