Walter Ledermann
Walter Ledermann FRSE ( 18 March 1911 , Berlin , Germany – 22 May 2009 , London , England ) was a German and British mathematician who worked on matrix theory , group theory , homological algebra , number theory , statistics , and stochastic processes . 
<triplet> Walter Ledermann <subj> 18 March 1911 <obj> date of birth <subj> 22 May 2009 <obj> date of death