Pedzisa mutsara unotevera: Pashure pokupedza kudzidza pachikoro chemutemo, Barber akashanda somubatsiri womugweta reruwa reNew York County kubva muna 1977 kusvika muna 1981. Muna 1981, Barber akabatana neBoston-based law firm of Looney & Grossman, achiva mudiwa muna 1985 uye achishanda semutungamiri wekambani kubva muna 2001 kusvika muna 2003. Kuita kwake mutemo kwakanangana nemakambani ekutanga uye kukakavara kwekutengeserana. Munguva yesarudzo yemutungamiri wenyika yeUnited States ya2008, Barber aive muunganidzi wemari uye aiwanzopa mari kuUnited States.
Mushandirapamwe waBarack Obama wokutsvaka kuva purezidhendi muna 2008. Barber aiva nhengo yeObama for America National Finance Committee.