Never heard of him.
Wesley Barbasa So (born October 9, 1993) is a Filipino and American chessgrandmaster representing the United States. He is the current United States Chess Champion.
A former chess prodigy, So became the youngest player to pass 2600 Elo rating in October 2008, breaking the record previously held by Magnus Carlsen.[1] This record has since been broken by John M. Burke.[2] In early 2013, So passed 2700 and in January 2017 So became the 11th player to pass 2800 Elo.
So won the 2017 Tata Steel Masters, the 2016 Grand Chess Tour title after claiming victory in the Sinquefield Cup and London Chess Classic, and the 2015 Bilbao Chess Masters. He is also a three-time Philippines Chess Champion.
Well that explains why I never heard of him. Sounds like he is pretty good, but not exactly world champion or anything like that.
.
I just realised that if Wes reversed his first name, he'd be GM Sew So. So there!