O bere ise o si bere sii ni igbega titi ti o fi di Chairman ati Chief Executive officer ile-ise naa ni 1997.. 
Yar'Adua ṣiṣẹ́ ní Sambo Farms Ltd ni Funtua, Ìpínlẹ̀ Kat, gẹ́gẹ́ bí aṣáájú –ọ̀nà gbogbogbo aṣáájú –ọna laarin ọdun 1983 si 1989.. 