Mr Gamaliel Onosode was the Chairman & Chief Executive of NAL Bank Plc (1973-79) Other major businesses and initiatives that he has chaired include Dunlop Nigeria Plc (since 1984), Cadbury Nigeria Plc (1977-93), Presidential Commission on Parastatals (1981), Nigeria LNG Working Committee and Nigeria LNG Limited (1985-90) and the Niger Delta Environmental Survey (since 1995). Mr. Onosode was Presidential Adviser on Budget Affairs and Director of Budget (1983). He is a Fellow of the Economic Development Institute of the World Bank, the Nigerian Institute of Management, of which he was President (1979-82). He is also a Fellow of The Chartered Institute of Bankers of Nigeria, having been elected to membership of its Board of Fellows in 1998.
In addition, Mr. Onosode is immediate past and inaugural President of the Chartered Institute of Stockbrokers, immediate past Pro-Chancellor and Chairman of the Governing Council of the University of Uyo and immediate past and inaugural President & Chairman of Council of the Association of Pension Funds of Nigeria. He is an Honorary Fellow of the Nigerian Academy of Letters and holds Honorary D.Sc. degrees of Obafemi Awolowo University (1990), the University of Benin (1995), and the Rivers State University of Science and Technology (2003) as well as Honorary D.D. degree of The Nigerian Baptist Theological Seminary, Ogbomoso (2002).
Mr. Onosode was admitted to the Honour Roll of Mellanby Hall, University of Ibadan, in 1982. He is a pioneer recipient of the Ughelli Descendants Union Distinguished Service Award (2000) and recipient of the Faculty of Arts University of Ibadan Golden Jubilee Distinguished Alumnus Merit Award (2001).
Mr. Gamaliel Onosode was a Member of the inaugural Provisional Governing Council of Bowen University, Iwo. He is currently the Chairman of the Delta State Think-Tank on Development, the Global Missions Board of the Nigerian Baptist Convention and the Governing Council of The Nigerian Baptist Theological Seminary, Ogbomoso.