Born June 2, 1963 in Veghel, The Netherlands
Professor of Chemistry, University of Waterloo, Canada
Web: external link
Medal of the International Academy of Quantum Molecular Science (2003), Member International Academy of Quantum Molecular Science (2016)
About 100 scientific articles in journals of chemistry and physics.
Coupled Cluster Green�fs Function (PhD): A recursive diagrammatic approach to the single particle Green�fs function without use of the intermediary self-energy or Dyson equation. The approach provides an alternative take on equation of motion coupled cluster methods for ionization potentials and electron affinities, and Feynman-Dyson amplitudes.
Similarity Transformed Equation of Motion Coupled Cluster (STEOM-CC) approach to excited states, as well as doubly ionized and doubly attached states. The approach uses a sequence of two many-body similarity transformations (normal ordered exponentials) to approximately decouple primary states of interest from the rest of the Hilbert space.
Construction of diabatic vibronic models, using EOMCC, and their application to simulations of molecular spectroscopy.
Development with Dominika Zgid of spin-adapted DMRG-SCF approach.
Multireference Equation of Motion Coupled Cluster (MR-EOMCC). Using a sequence of Many-Body similarity transformations and the use of Kutzelnigg-Mukherjee normal ordering for a multiconfiuational reference defines a transformed Hamiltonian. Hundreds of excited states can be obtained from subsequent diagonalization over a compact CAS+1h+1p space. The method is implemented in both the ACESII and ORCA packages using automated computer code generation.
Introduction of generalized extensivity, a conjecture regarding exactness of parameterization using two-body cluster operator, elimination of Coulombic singularities using similarity tranformations, work on generalized Wick�fs theorems for multiconfigurational reference.