Prof. Don U. Deere died on 14 January 2018 in Gainsville, Florida. He wrote and co-authored numerous papers and was the inventor of the rock mass assessment tool, the RQD – Rock Quality Designation. Together with Prof. Giovanni Lombardi, he invented the GIN method of grouting.
Prof. Richard Z.T. Bieniawski, died on 11 December 2017 at his home. He was born in 1936, in Krakow, Poland. He was one of the most prominent and influential rock engineering personalities of the 20th century.