His name is James Corden.
After his tribute to Orlando, The Tonys host used the cast of Hamilton for the opening number, bu nstead of "Alexander Hamilton" it was "James Corden."
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James Corden Parodies 'Hamilton' Opening Number at 2016 Tony Awards
Artist Mentioned
Watch the performance above, which features Hamilton stars Leslie Odom Jr. (Aaron Burr), Daveed Diggs (Lafayette/Thomas Jefferson), Anthony Ramos (John Laurens/Phillip Hamilton) and Okieriete Onaodowan (Hercules Mulligan/James Madison.)