Pieter D. Wezeman is a Senior Researcher in the SIPRI Arms Transfers Programme. Within his overall objectives of contributing to the understanding of the effect armament dynamics have on peace and conflict and supporting arms control and disarmament efforts, his main areas of expertise include the global production and proliferation of arms and other military technology and trends and patterns in military expenditure. Currently his regional focus is mainly on the Middle East, and Northern Europe. Multilateral arms embargoes and international transparency in armaments are amongst the key thematic issues he works on. ​ Wezeman started at SIPRI in 1994, worked in 2003–2006 as a Senior Analyst at the Dutch Ministry of Defence on issues related to the proliferation of conventional and nuclear weapons, and returned to SIPRI in 2006. In 2017 he was the Technical Expert for the Group of Governmental Experts that reviewed the UN Report on Military Expenditure. ​