KPMG AG Auditing Company (2019-2021)

Central Government Audit Service of the Netherlands (2016-2018)

Central Government Audit Service of the Netherlands (2013-2015)

Office of the Auditor General of Norway (2009-2011)

Office of the Auditor General of Norway (2006-2008)

The Portuguese Audit Court (2004-2006)

Sweden (2001-2003)

Spain (1998-2000)

Israel (1995-1997)

Austria (1994)

Finland (1991-1993)

Austria (1988-1990)

Austria (1985-1987)

Court of Audit, Switzerland (1982-1984)

Rig Audit, Copenhagen, Denmark (1979-1981)

Rig Audit, Copenhagen, Denmark (1976-1978)

Central Government Audit Service of the Netherlands (1973-1975)