Mariano Rivera (born November 29, 1969, in Panama City, Panama) is a professional baseball player. He is a relief pitcher for Major League Baseball’s New York Yankees. He throws and bats right-handed. Nicknamed Mo Rivera originally began his Major League career as a starting pitcher in 1995, but it was after he was moved to the bullpen and converted to closer that he found success. He has subsequently become one of the premier closers in the majors.