He attended Ahmadu Bello University, Zaria where he earned a law degree, and was called to the Bar in 1979.
He served as Senior Counsel, and then Chief Draftsman of the Niger State House of Assembly (1983–1989).
Gimba was also Principal Partner, Summit Chambers, Chief Executive, Century Policy Consultants, Abuja and a member of the Northern Nigerian Strategic Analysis Group from 2005 to 2006.
[1] He was against having a Nigerian contingent at the 2008 Olympic Games since he believed that the trip would be a waste of tax payers' money.
He formally withdrew Nigeria's bid to host to final phase of the 2010 FIFA World Cup Qualifiers in Africa due to lack of funds.