Romanian President Nicușor Dan won gold medals and perfect scores at International Mathematical Olympiads (years 1987 and 1988)

Nicușor Daniel Dan (born on 20 December 1969) is a Romanian politician, former civic activist and mathematician serving as the sixth president of Romania since 2025. He previously served as the mayor of Bucharest from 2020 to 2025 and as a member of the Chamber of Deputies from 2016 to 2020.

He studied mathematics in France, he attended the École Normale Supérieure, one of the most prestigious French grandes écoles, where he earned a master's degree. In 1998 Dan completed a PhD in mathematics at Paris 13 University.

Dan has consistently advocated pro-Western views, emphasizing Romania's integration into the European Union and NATO as cornerstones of national security and economic progress. In his 2025 presidential campaign, Dan positioned himself as a staunch defender of Western democratic values; he supported NATO's presence in Romania, particularly amid the Russian invasion of Ukraine, contrasting sharply with nationalism and Euroscepticism.