Hamman started her career as lecturer at department of accounting at Ahmadu Bello University. she serve the University in leadership as deputy Director of ICERFE and belongs to various academic committee with associations. She has worked as special advisor to the executive chairman of the
Federal Inland Revenue Service (FIRS). she partner with the African Tax administration Forum (ATAF) launched volume 5 of the African Multidisciplinary Tax Journal (AMTJ). Hamman's research has contributed to tax and public finance policies in over 24 African nations through her work with the
African Tax Administration Forum (ATAF). == Works ==