Jacek Semaniak: key obituary facts
Is Jacek Semaniak dead? Yes. Jacek Semaniak died on December 12, 2025, at age 61.
Cause of death: Jacek Semaniak's cause of death has not been publicly confirmed.
What was Jacek Semaniak known for?
Jacek Semaniak was a Polish physicist.
Polish physicist
Died on Friday December 12th 2025