A leading figure in our scientific community, Guy Juanole left an indelible mark on the fields of communication networks, real-time systems, Petri nets, and formal methods.

After earning his doctorate in 1968 and the "state doctorate" in 1978, he established himself as a pioneer in the modeling and analysis of distributed real-time systems, focusing particularly on task and message scheduling and resource management in distributed environments. He contributed significantly to the development of the Stochastic Timed Petri Net model (STPN). His work formalized and qualitatively and quantitatively analyzed various fieldbus communication protocols used in the avionics and automotive sectors, as well as Quality of Service (QoS) mechanisms used in computer networks. He was also among the first to bridge the disciplines of automation and networking, exploring the connections between network QoS and Quality of Control (QoC) in networked control systems.

Guy was passionate about his role as a "researcher/teacher," as he liked to call it. He was always fully committed to his scientific work, generously giving his time and energy. Notably, he invested great effort in building a community that he envisioned as broad and borderless-bringing together automatic control and computer science around communication networks, formal methods, and more. Guy was a driving force, especially in research groups and summer schools, leading initiatives on "real-time" and "quality of service."

He was renowned for his ability to make complex concepts accessible, using concrete examples to illustrate fairness and performance in processor time management. He inspired others with his passion for science and scientific rigor, while always remaining profoundly human.

Beyond his scientific achievements, Guy was universally appreciated for his kindness, humility, and attentive listening. His availability, patience, and sense of humor made every interaction pleasant and enriching. His infectious good humour, often punctuated by jokes, created a friendly and relaxed atmosphere around him. His natural benevolence and spontaneity made him a beloved and endearing colleague.

His commitment, unifying spirit, and generosity left a lasting impression on all who had the privilege of working alongside him. His passing leaves a great void, but his intellectual and human legacy will live on through his work and through all those he trained and inspired.

To his family, loved ones, colleagues, and all who knew him, we send our warmest and most sincere thoughts.

Thank you, Guy, for all you have contributed to our community and to each and every one of us.

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