Severin Hacker
Severin Hacker ( born 1984 ) is a Swiss computer scientist who is the co-founder and CTO of Duolingo , the world's most popular language-learning platform . 
<triplet> Severin Hacker <subj> 1984 <obj> date of birth <subj> CTO <obj> occupation <triplet> Duolingo <subj> Severin Hacker <obj> founded by