Jacek Rajchel

Jacek Maria Rajchel (30 January 1944 – 5 April 2020) was a Polish geologist, author and educator who specialised in biostratigraphy, lithology and geological structure recognition of the Carpathian Mountains, and architectural applications of earth materials—especially those in the southern Polish city of Kraków, where he had lived for most of his life. Provided by Wikipedia