Barrett (b. 1988) played in the majors in 2014, 2015, 2019 and 2020 for the Nationals. He had a career record of 6-3 with 86 strike outs and a 4.01 ERA. He re-signed with the Nationals in November 2020, so he may hit the majors again this season.
I mailed to Barrett on December 15 and got the card back signed on January 14, for a 30-day TAT.