come on guys... drtancredi is vladimir kramnik...
Who is GM DrTancredi? Defeated Nakamura 21-15 in bullet.
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it's naroditsky
I think it's Maurice Ashley. You need to be pretty smooth to defeat Naka in a bullet match.
@macer75 smooth indeed! 
Well from what I’ve seen I’m not sure but I don’t think it’s Carlsen(blitz matches with Nakamura have been found on his profile where Tancredi lost badly - check out the 2016/2017 SCC to see Carlsen vs Nakamura finals)
....it's macer75. Nobody believe him when he says it's Maurice.
So.... Naroditsky?
Yes.
Me
he is magnus
It's Daniel Naroditsky!
Yeah, during a stream Danny said for those who don't know, @DrTancredi is Daniel Naroditsky.
Oh really? great that we finally have an answer. I'm too lazy to watch old streams 
thanks @GM_chess_player and @Ridics
It's Jeremy Silman.