Born in Czeladź, Poland, he entered the Kraków School of Fine Arts, a reknowned graphics arts center in 1945. While still a student, he was hired by Poland's printing bureau and began his career as an engraver. In 1951 he engraved his first stamp for Poland.
In 1959, Słania moved to Sweden where he became the chief engraver for the Swedish postal authority. He has produced numerous stamps for Sweden, and (at present) 28 different countries. His work is of such recognized quality and detail that he is one of the very few "household names" among philatelists, and some specialize in collecting his work alone.
Denmark's Queen Margrethe, 1975; Slania's name is clearly visible in the lower right margin.