Tadeusz Gerus passed away on April 7, 2020. He attended Silesian University in Poland to study mining mechanization, graduating in 1964 with a master of science. He began his 40 years career as a mining engineer engaged in research and design of mineral processing equipment particularly crushers and screens. He held many patents and was a long-time member in ISO TC 27, participating in conferences in the USA, China, South Africa. He was engaged in development of standards on comminution and screening. He retired in 2002.