Grzegorz (Gregory) Kersten was a graduate of the Warsaw School of Economics. From 1974 to 1984, he worked at the Institute of Management and Personnel Development in Warsaw, and from 1985 to 1999 at Carleton University in Ottawa. From 1999 to 2020, he was a professor at Concordia University in Montreal and an adjunct professor at the Sprott School of Business at Carleton University. In 2002, he was awarded the Paul Desmarais/Power Corporation Professorship at the University of Ottawa, and since 2006, he held the position of Senior Concordia Research Chair. In 1995, he founded the InterNeg group, which evolved into the InterNeg Research Centre funded by NSERC, SSHRC, the International Institute for Applied Systems Analysis in Austria, and other scientific organizations. He was the organizer of the academic life within the INFORMS Section on Group Decision and Negotiation and the editor-in-chief of the JCR-listed journal Group Decision and Negotiation. He authored and co-authored over 100 articles, 2 books, and numerous scientific presentations. A member of the N.EA team and a close friend of its members, he passed away suddenly on May 26, 2020, in Ottawa.