After teaching briefly at the Notre Dame high School, Abatete, he joined Shell-BP Petroleum Development Company in September, 1960 as a Petroleum Exploration Geophysicist. Because of the Nigerian Civil war, he went on to work for the petroleum Management Board of Biafra, from 1967, until 1970 when he was re-absorbed by Shell-BP. Shortly thereafter, he went on a cross-posting assignment to the Hague in January 1972.

He returned to shell-BP in January 1974, and resigned in February 1974 to join the Nigerian National Oil Corporation in May 1974 as the Company’s Head of Exploration. In 1977, the NNOC became the NNPC, and in 1978, Ben Osuno was appointed the Corporation’s General Manager, Exploration and Production. in 1979, he was redeployed to take charge of the Petroleum Inspectorate as Head Petroleum Inspectorate, later director Petroleum Resources, and later Director, Planning, Research and Statistics in the Ministry of Petroleum Resources, until he voluntarily retired in January, 1992. In May 1992, he was appointed he Special adviser to the Minister of Petroleum Resources.

During his public service career, he had a number of extra-curricular appointments, such as:

(a) Chairman, management Committees of the NNOC from March 1976 to July, 1977.

(b) Chairman of the joint operating Committees of the various Joint Venture Oil companies, from March 1976 to December 1978.

(c) Chairman of the Governing Council of the Petroleum Training Institute, effurun near Warri, from January 1979 to April 1990.

(d) Chairman of the Petroleum Technology Development Fund (PTDF). from January 1979 to April 1990.

(e) Nigeria’s Governor to OPEC, from January 1980 to January 1992.

(f) Chairman OPEC Board of Governors 1988.

(g) Nigeria’s Representative on the Permanent council of the Corld Petroleum Congresses, from 1987 to January, 1992.

(h) Chairman National Committee of the World Petroleum Congress for Nigeria, from 1990 to January, 1992.

In the 1980’s Ben Osuno served as the Financial Secretary for the Lagos Branch of GCUOBA and has remained an executive member of the Branch till date.

He is a Fellow of the Nigerian Mining and Geosciences Society (FNMGS), Fellow of the Nigerian Association of Petroleum Explorationist (FNAPE), and Patron/honorary Fellow of the Nigerian Environmental Society.

Ben Osuno is married to Comfort Nkolika Osuno (Nee Iweka), and they have five children and five grand children.

CNC Nweke - President, GCUOBA Lagos Branch

P.N. Obidike (Engr, Chief, Sir.)

Prof. Eugene Onyekwelu Arene

Barr. Uchenna Chinenye Ihediwa

Barr. Theodore Anachuna Ezeobi (SAN)

Engr. David Faybian Ejikeme Obianyor

Engr. Dominic Okafor Igboesoka Ekesi

Col. Anthony Okoro Eze

HRH, Prof. Laz Edward Nwanyelu Ekwueme

Engr. Bertram Ogugua Anyaoku

Surv. Damian Anaekperechi Nzenwa

Engr. Christopher Ekegbo Okoye

Engr. Joseph A. Iro

Engr. L.A.O Amu

Sir. Chike Onyeka

Chukwuemeka Ifezulike