Jerzy Pniewski (June 1, 1913 – June 16, 1989) was a Polish physicist. Pniewski was born in Płock. He studied mathematics and physics at the University of Warsaw. In 1952, he co-discovered the hypernucleus with Marian Danysz. In 1962, he discovered hypernuclear isomery. References 1913 births 1989 deaths 20th-century Polish physicists