On October 15, 2019, the IEEE Computational Intelligence Society (CIS) lost a great volunteer, Dr. Enrique Ruspini, who devoted a large portion of his professional life to the conception, development and growth of CIS. On the same day, our scientific community lost a great scientist, as Enrique was one of the first pioneers in fuzzy clustering and approximate reasoning, providing a similarity-based interpretation of fuzzy logic. Finally, Bernadette, Piero, and Jim, and many of us lost Enrique, a great friend, who was always ready to help on a moment’s notice. It is difficult to describe Enrique in a few words, and it is even more difficult to separate the volunteer from the scientist. Enrique H. Ruspini received his de gree of Licenciado en Ciencias Matemáticas from the University of Buenos Aires, Argentina, and his doctoral degree in System Science from the University of California at Los Angeles. He was one of the earliest contributors to the development of fuzzy set theory and its applications, having introduced its use to the treatment of numerical classification and clustering problems. He also made significant contributions to the understanding of the foundations of fuzzy logic and approximate reasoning methods. His recent research focused on the applications of fuzzy logic techniques to the development of systems for intelligent control of teams of autonomous robots, information retrieval, qualitative description of complex objects, and knowledge discovery and pattern matching in large databases. Dr. Ruspini was the author of over 100 original research papers, a Life Fellow of the Institute of Electrical and Electronics Engineers, a First Fellow of the International Fuzzy Systems Association, a Fulbright Scholar, and an SRI Institute Fellow. He received the Meritorious Service Award of the IEEE Neural Networks Society for leading the transition of the Neural Networks Council into Society status. Jim still remembers when he was sitting with Enrique on the flight home from the International Congress for Cybernetics and Systems, which was held in Acapulco in 1980. At that time there were no professional organizations dedicated to fuzzy sets and system models, so they decided to form one. Enrique led the way, recruiting Lotfi Zadeh, who then recruited King-Sun Fu, to help us in this endeavor. Without Bernadette Bouchon-Meunier Paris, FRANCE