Siegfried Linkwitz
Siegfried Linkwitz ( November 23 , 1935 – September 11 , 2018 ) was a German American engineer who was noted co-inventor of the Linkwitz–Riley filter along with Russ Riley . 
<triplet> Siegfried Linkwitz <subj> November 23, 1935 <obj> date of birth <subj> September 11, 2018 <obj> date of death <triplet> Linkwitz–Riley filter <subj> Siegfried Linkwitz <obj> named after