The young Kosoko grew up in Ebute Metta and was inspired by the success of Hubert Ogunde to go into acting, when an acquaintance [8] who was working with the Ifelodun Traveling theatre troupe invited him to audition for a role in Makanjuola, a tele-movie, Kosoko accepted the invitation, he auditioned and was chosen for the role, playing a [9] played a character called Alabi.[10] Kosoko continued with acting, he performed with the Awada Kerikeri group consisting of Sunday Omobolanle, Lanre Hassan and Oga Bello,[11] and had guest appearances on the T.V. Show, New Masquerade.[12] In 1972, he formed his own group theatre troupe.[11]