He’s Kenley Jansen, he’s been one the best relief pitchers in baseball over the last 13 years, and, frankly, I’m disappointed in you for not already knowing that.
Jansen actually started his professional career as a catcher, and was famously behind the plate when the Netherlands upset the Dominican Republic in the 2009 World Baseball Classic. But after slashing just .227/.298/.397 as a 20-year-old in A-ball, the Dodgers convinced him to give pitching a shot. Two years later, he made his Major League debut in the 7th inning of a tied game against the Mets, retired Angel Pagan, David Wright, and Carlos Beltran in order, and never looked back.