Johnson was first appointed by
Aguiyi-Ironsi as the administrator of the former federal territory of Lagos in 1966. Ironsi was the head of state and wanted someone from Lagos to handle some of the problems of the federal territory. In May 1967, Lagos State was created and Johnson became the first governor of Lagos; the state was now composed of the old Federal Territory of
Victoria Island,
Ikoyi and
Lagos Island plus the additions of the
Epe,
Badagry,
Ikorodu and
Ikeja divisions. He was involved in developing the civil service in Lagos State. Johnson was initially assisted by key civil servants, including Administrative Secretary Adeymi-Bero, Legal Secretary Alh. I. O Agoro, Finance Secretary
F.C.O Coker, and the Acting Secretary to the Military Government Howson Wright. He waited until April 1968 before appointing his commissioners.
Building Lagos • 60.7-kilometre international express road (Lagos–
Badagry Expressway) linking Nigeria with the neighbouring countries Benin, Ghana and Togo. • Toikin Bridge to link Epe to Ikorodu •
Eko Bridge •
Third Mainland Bridge • A network of roads and bridges that constitutes what is modern day Lagos • Reclamation of the Bar Beach shoreline. Another coup in 1975 brought in a new military government, which came to power under an anti-corruption banner.
Demolition of Ajele Cemetery Johnson's administration was responsible for the demolition and disinterment of people buried at
Ajele Cemetery such as
Samuel Ajayi Crowther,
James Pinson Labulo Davies,
Madam Tinubu,
Thomas Babington Macaulay, and many others. The demolition met with a lot of criticism: Prof
J.D.Y. Peel noted that the demolition had deprived "Lagosians not only of a precious green space in the heart of the city but of the memorials of their forebears". Nobel Laureate
Wole Soyinka called the demolition "the violation of that ancestral place" noting that "the order came from the military governor [Mobolaji Johnson]: 'Dig up those dead and forgotten ancestors and plant a modern council building – with all its lucrative corollaries on that somnolent spot". ==Retirement==