Tristan Bauswein is the Acting Deputy Director General and Head of the Department of Management. In this role, Mr Bauswein oversees the delivery of a wide range of financial, human resources, management, administrative, information technology, and general services that enable the IAEA to successfully deliver its scientific and technical programmes. He holds this position as of January 2021 until the appointment of the next Deputy Director General and Head of the Department of Management.

For over twenty years, Mr Bauswein has worked for international organizations in the area of budget, finance and administration. Since 2015, he has been the IAEA's Chief Financial Officer and Director of the Budget & Finance Division in the Department of Management. Previously, he worked as the Chief of the Budget & Finance Section and the Director of the Administration & General Services Division at the World Trade Organization (WTO). He also worked as the Head of Internal Audit for the European Organization for Nuclear Research (CERN).

Mr Bauswein holds a Bachelor of Arts (Hons) in European Business Administration from the Middlesex University in London (UK) and the Reims Management School in France. He has earned several professional certifications, including Certified Internal Auditor, Certified Fraud Examiner and Chartered Certified Accountant ACCA/FCCA.