His father was a member of Herbert Macaulay's Nigerian National Democratic Party and a Lagos-based community group known as the Egbe Ilu.
Olorun-Nimbe started his education learning Quranic verses, he then proceeded to study at a government primary school in Lagos.
His appointment was terminated by the colonial service in 1940 and he went into full-time private practice in Lagos establishing Alafia Hospital.
Olorun-Nimbe's foray into politics started in 1944 when he was elected a councillor in the Lagos Town Council and he was a participant in NCNC's Pan-Nigerian tour.
[3] During the same year, he was also a member of NCNC's delegation to London to protest the Richards Constitution which operated on the practice of nomination rather than election to the regional and central assembly.