Dee ihe na-aga n'ihu maka paragraf a - Gregory John Kosc (amụrụ na Eprel 27, 1949) bụ onye bụbu onye ọka ikpe na Major League Baseball onye rụrụ ọrụ na American League site na 1976 ruo 1999. Ọ na-ekpe ikpe na World Series na 1987 na 1997, na na All-Star Game na 1981 na 1992. Ọ rụkwara ọrụ na American League Championship Series n'afọ 1979, 1988 na 1993
, na American League Division Series n'afọ 1996 na 1997. Kosc yi uwe ejiji 18 mgbe ndị American League umpires nakweere ha na 1980.