Kammala wannan magana: Sam Holbrook ya fara aikinsa a gasar Appalachian a 1990, sannan ya yi aiki a Midwest, Carolina, Texas, Gabas da Ƙasashen Duniya kafin ya fara gasar Major League a watan Yuni, 1996. Holbrook ya yi aiki a kakar wasa ta 1996 a gasar zakarun Amurka, sannan ya biyo bayan yanayi uku a gasar zakarun kasa. A cikin 1999, yana ɗaya daga cikin alƙalai 22 waɗanda aka karɓi murabus ɗin su (a cikin dabarar tattaunawar ƙungiyar da ta gaza), kuma an sake ɗaukar sa a cikin 2002, yana yin hukunci da wasanni a cikin manyan wasannin biyu tun daga wannan lokacin. Holbrook ya yi hukunci a cikin jerin rukuni biyar (2005, 2007, 2010, 2013, 2019), jerin gasar zakarun Turai hudu (2008, 2009, 2011, 2012), da kuma jerin duniya uku (2010,
2016, 2019). Har ila yau, ya yi aiki da MLB All-Star Game na 2004. Holbrook an nada shi shugaban ma'aikata a watan Fabrairun 2017 ta MLB. Greg Gibson, Jim Wolf da D.J. Reyburn sun haɗu da shi a cikin ma'aikatansa na 2017.