Sir Ahmad appointed him as the third class clerk in Northern Nigeria Secretariat 1949, he also was instructor at Clerical Training College, Zaria, now Institute of Administration ABU, Zaria, Then he was assistant district officer, provincial secretary, permanent secretary, and acting secretary of military government in Kano and North Western Nigeria. At early his 30s, he was acting permanent secretary, Ministry of Justice. After that he rose to the permanent secretary 1974.[3]
In the 1967 creation of states. Niger State, was created in 1976, Lemu later became the chairman and
chief executive officer of Niger State Water Board, up to1979. The same year, he also rose the state commissioner for works and housing. He played the following roles in subsequent years as member Code of Conduct Bureau, And chairman, Kaduna Polytechnic Governing Council, member, Arewa House Project, member, Niger State Local Government Elections Tribunal 1997,
member, Bida Emirate, Zonal Zakkat Committee. He was awarded Niger State Merit Award 1997 by the Niger State government. His career spanned work in Nigeria and United Kingdom, where he worked in the Office of the Commissioner of Nigeria and Office of the Commissioner for Northern Nigeria, first in 1954 and of 1957. And was appointed honorary peace ambassador, of Niger
State, in National Peace Forum, in 2003 and till his death [4]
Lemu was the protocol officer and the principal private secretary of the late Sir Ahmadu Bello, Premier of Northern Nigeria, Sardaunan Sokoto.[5][6]
He died in Minna,[7] at the age of 95, 2017 and survived four wives, 25 children, 70 grandchildren 100 great-grandchildren.[8][9]
