Nicolae Dimitrie Xenopol was a Romanian politician, diplomat, economist and writer, the younger brother of historian Alexandru Dimitrie Xenopol and, like him, a member of Junimea society. Initially inspired by Junimea leader Titu Maiorescu, he was later a dissident of Junimism, a Positivist and a supporter of literary realism. Politically, Xenopol also moved away from conservatism and was embraced by the liberal current, serving as editor of two liberal newspapers: Românul and Voința Națională. He had a successful career in electoral politics, which began within the National Liberal Party and later saw him joining the Conservative-Democratic Party. In 1912, he was Minister of Commerce, and helped create an Academy of Economic Studies.
Nicolaes Witsen was a Dutch statesman who was mayor of Amsterdam thirteen times, between 1682 and 1706. In 1693 he became administrator of the Dutch East India Company (VOC). In 1689 he was extraordinary-ambassador to the English court and became Fellow of the Royal Society. In his free time, he was cartographer, maritime writer, and an authority on shipbuilding. His books on the subject are important sources on Dutch shipbuilding in the 17th century. Furthermore, he was an expert on Russian affairs. He was the first to describe Siberia, the Far East and Central Asia in his study Noord en Oost Tartarye [North and East Tartary].
Nicolai Alexandrovich Vasiliev, also Vasil'ev, Vassilieff, Wassilieff, was a Russian logician, philosopher, psychologist, poet. He was a forerunner of paraconsistent and multi-valued logics.
Paul Nicolai Hartmann was a Baltic German philosopher. He is regarded as a key representative of critical realism and as one of the most important twentieth-century metaphysicians.
Nicolai Juul Foss is a Danish organizational theorist, and scholar of entrepreneurship and strategy. He is currently a professor at the Copenhagen Business School where he has spent most of his career. Foss' main contribution to organization theory is through the micro-foundational perspective in organization theory and management—examining how individual behaviors aggregate to affect the behavior of larger groups and organizations. He was made a Knight of the Order of the Dannebrog in 2015.
Nicolai Feopemptovich Soloviev, sometimes Solovyov, was a Russian music critic, composer, and teacher at the Saint Petersburg Conservatory. His notable composition students include Samuel Maykapar, Mihkel Lüdig, Artur Lemba, and Peeter Süda. See: List of music students by teacher: R to S#Nicolai Soloviev. Soloviev composed several operas, an overture, and the symphonic poem Russians and Mongols, and assisted in the completion of Alexander Serov's opera, The Power of the Fiend.
Nicolas John Barker is a British historian of printing and books. He was Head of Conservation at the British Library from 1976 to 1992 and is a former editor of The Book Collector.