Ambassador Thomas Greminger served as Secretary General of the Organization for Security and Co-operation in Europe (OSCE) from July 2017 until July 2020. On May 1, 2021, he took over as Executive Director of the Geneva Centre for Security Policy (GCSP). As Secretary General, he acted as an effective crisis manager supporting successive Chairmanships in an increasingly polarized environment. In the final months of his term, he dealt with the COVID-19 crisis, working to protect the health and safety of staff while ensuring that the OSCE continued to carry out its critical mandates and maintained business continuity.