Zbigniew Ciesielski (1934-2020)

Zbigniew Ciesielski at Wikipedia.

Zbigniew Ciesielski at the Mathematics Genealogy Project.

Zbigniew Ciesielski at MathSciNet (for those with access).

List of Publications of Zbigniew Ciesielski.

Obituary notice from IM PAN.

In Polish, the homepage of an exhibition (Winter 2015) dedicated to Zbigniew Ciesielski is here, and in English translation here.