William A. Cassidy
William A . Cassidy ( 3 January 1928 – 22 March 2020 ) was an American geologist and professor emeritus of Geology and Planetary Science at the University of Pittsburgh . 
<triplet> William A. Cassidy <subj> 3 January 1928 <obj> date of birth <subj> 22 March 2020 <obj> date of death