 An Urhobo man, born and raised in Sapele, a suburban city in the current Delta State by a disciplined father, he sometimes credited the strict family background and practice as being a complementary factor in his success as a disciplined civil servant and corporate administrator.Throughout his career, Onosode has chaired several private and public sector businesses and initiatives.He was the Chairman of Dunlop Nigeria Plc (1984–2007), a former chairman of Cadbury Nigeria Plc (1977–93), the Presidential Commission on Parastatals (1981), Nigeria LNG Working Committee and Nigeria LNG Limited (1985–90) and the Niger Delta Environmental Survey (since 1995).