2015-2018 :  Director of Research, U Cambridge

2011-2015: Head of the Department of Chemistry, U Cambridge
2007-2015: 1968 Professor of Theoretical Chemistry, U Cambridge
1977 – 1980 UCLA Los Angeles, CA, USA Postdoctoral Research Fellow Department of Chemistry and Biochemistry.

1980 – 1981 Shell Research Amsterdam, NL
Research Scientist Department of Separation Technology.

1981 – 1986 Utrecht University Utrecht, NL Universitair docent/hoofddocent (Lecturer/Reader) Department of Physics.

1987-2013 FOM Institute for Atomic and Molecular Physics Amsterdam, NL
Group Leader
Started computational-physics research line.

1987-2007 Utrecht University Utrecht, NL
Professor (part time)
Associated with the Van ‘t Hoff laboratory for Colloid Science.

1998-2013 University of Amsterdam Amsterdam, NL
Professor (part time)
Associated with the Van ‘t Hoff Institute for Molecular Science.