[1] After graduating from the Vasile Alecsandri National College in Galați, he studied at the University of Bucharest, where he was student of Grigore C. Moisil and Solomon Marcus.

[3] He is currently chair professor at the University of Auckland,[4] New Zealand and also the founding director of the Centre for Discrete Mathematics and Theoretical Computer Science.

[8] In 2017, together with Sanjay Jain, Bakhadyr Khoussainov, Wei Li, and Frank Stephan, he announced an algorithm for deciding parity games in quasipolynomial time.

[11] Calude was awarded the National Order of Faithful Service in the degree of Knight[12] by the President of Romania, Mr. Klaus Iohannis, in June 2019.

In 2021, together with Sanjay Jain, Bakhadyr Khoussainov, Wei Li, and Frank Stephan, he won the EATCS Nerode Prize[13] for their quasipolynomial time algorithm for deciding parity games.