Renaissance Technologies
Both of them were computer scientists specializing in computational linguistics who joined Renaissance in 1993 from IBM Research . Simons continued to play a role at the firm as non-executive chairman ( he stepped down in 2021 ) and remains invested in its funds , particularly the secretive and consistently profitable black-box strategy known as Medallion . 
<triplet> computational linguistics <subj> computer scientists <obj> subclass of <triplet> IBM Research <subj> computer scientists <obj> field of work