Born April 18, 1961 in Opperdoes, The Netherlands.
Professor of Theoretical Chemistry, Karlsruhe Institute of Technology, Germany.
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Hans-G.A.-Hellmann Prize of the Arbeitsgemeinschaft Theoretische Chemie (1999); Medal of the International
Academy of Quantum Molecular Science (1999); Member,
Institute of Nanotechnology, Karlsruhe Institute of Technology (since 2003); Member, Coordinating Committee of the Center
for Functional Nanostructures (since 2005); Member, Peer Review Board of John von Neumann Institute for Computing,
Forschungszentrum Jülich (since 2008); Member, Fachforum Chemie (303-02) of the Deutsche Forschungsgemeinschaft
(since 2008); Member, International Academy of Quantum Molecular Science (2011); Editorial Advisory Board,
ChemPhysChem, Chemical Physics Letters and Molecular Physics.
About 200 scientific articles in journals of chemistry and physics.
Development of explicitly correlated R12 and F12 methods in the frameworks of coupled-cluster theory as well as
many-body perturbation theory. Key developments have been the efficient computation of the necessary two-electron
integrals, the orbital invariant formulation of the theory, the introduction of auxiliary basis sets for the
resolution-of-the-identity approximation in R12/F12 theory, and the development of the CCSD(F12) coupled-cluster model.
Development of basis set extrapolation techniques for the accurate calculation of electron correlation energies
as well as electron correlation contributions to molecular properties, including the individual extrapolation
of singlet and triplet pair energies.
Benchmarking of binding energies, reaction energies, barrier heights, and atomization energies,
as well as benchmarking of equilibrium structures (e.g., the H2O dimer) and potential energy hypersurfaces
(e.g., the HF dimer) using R12/F12 methods. Weakly interacting systems (hydrogen bonding, van der Waals interactions)
have been of particular interest.
Development and implementation of perturbative methods for relativistic effects (i.e., direct perturbation theory)
and of quasirelativistic two-component theories in the framework of explicitly correlated second-order perturbation theory.