Rubuta ci gaba ga wannan sakin layi - Sam Holbrook ya fara aikinsa a cikin Appalachian League a shekarar 1990, ya biyo baya a cikin Midwest, Carolina, Texas, Gabas da Ƙasashen Duniya kafin ya fara buga 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.