prev. Polish Army and Air Force; from 1925, one of the first five pilots of LOT.
In September 1939, he flew LOT's Lockheed Electra SP-BNF from Finland, bringing Alexandra, the wife of Marshal Józef Piłsudski, and their daughters Wanda and Jadwiga.
Klemens and Jadwiga both joined the ATA.
Post-WWII, rejoined LOT.
d 3 July 1985 and is buried at the Powązki Cemetery, Warsaw.