Lengkepan kalimah di handap ieu: Cooper jadi wasit permanén Liga Utama Baseball dimimitian dina taun 1999. Manéhna digawé di Divisi Series (2003, 2005, 2006, 2008, 2009, 2011, 2012, 2013, 2014, 2019), Liga Championship Series (
2004, 2015, 2016, 2017), nu Liga Utama Baseball Wild Card Game (2015 jeung 2016, 2017), nu 2014 World Series, jeung 2005 All-Star Game. Cooper ogé digawé di World Baseball Classic dina taun 2009 jeung 2013.