Nicușor Daniel Dan is a Romanian mathematician and politician serving as the seventh 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.
Born in Făgăraș, Brașov County, Dan earned international acclaim in his youth as a mathematician, securing gold medals and perfect scores at the 1987 and 1988 International Mathematical Olympiads. He began studying mathematics at the University of Bucharest and then moved to France, where he obtained a master's degree from École normale supérieure and a PhD from Paris 13 University.