Emilio Gatti has been a genuine pioneer in the scientific research associated with electronic instrumentation for experiments in atomic and nuclear physics for over sixty years. In his professional activity, he has combined creativity and intuition with an exceptional theoretical ability based on a deep knowledge of electromagnetism and the most advanced methods of mathematical analyses, which he used in the solution of complex problems. Emilio Gatti has been a mentor for the several collaborators who have learnt from him his methods of analysis, his attention and precision in examining the experimental results of the measurements, and his passion for science, engineering and research. Many of his students and collaborators have subsequently given birth to research teams in the field of electronics, both at Politecnico di Milano and at other Italian Universities. Emilio Gatti was a man in whose character extreme gentleness and mildness stood out together with a humility and generosity as evolved as his intelligen- ce and scientific culture. Emilio Gatti loved working alongside his collabora- tors and students, generously sharing his extraordinary skills and his vast and profound knowledge, without ever making anyone uncomfortable but rather making everyone an active participant in the work.