Ngrampungake ukara ing ngisor iki: Cooper dadi wasit permanen ing Major League Baseball wiwit taun 1999. Dheweke kerja ing Divisi Seri (2003, 2005, 2006, 2008, 2009, 2011, 2012, 2013, 2014, 2019), Seri Kejuaraan Liga (
2004, 2015, 2016, 2017), Major League Baseball Wild Card Game (2015 lan 2016, 2017), World Series 2014, lan 2005 All-Star Game. Cooper uga nyambut gawe ing World Baseball Classic ing taun 2009 lan 2013.