The oldest local consulting firm, Obi Obembe and Associates, was established in Ibadan in 1958 by Engr. Obi Obembe, a civil and structural engineer; Engr. Iyiola Omisore started Iyi Omisore & Associates in 1962 before Engr. Afolabi joined the firm as Omisore Afolabi & Partners; Dr. Charles Chuba Agbim, born in October 1934, founded Agbim & Partners, a civil and structural engineering consulting firm; Adejumo & Partners was founded in 1966 by Engr. Dr. Adenrele Adejumo. In 1970, he joined with Engr Olusola Ogunsola to form the firm of Adejumo Ogunsola and Partners.
The fifth oldest and the oldest services engineering firm was Chris Fajemirokun & Associates, founded in 1967 by Engr. Chris Fajemirokun a founding member of ACEN; Civ-Struct Associates was formed as a partnership of two very active and committed members of ACEN, Engr. Titus Olagoke Bamgbopa, and Engr. Sikiru Olatunbosun Oke; Osot was formed in 1968 by three partners, Engrs Adeniyi Olufemi Olumide, Kayode Ayinde Segun and Adegbola Tokun.
The last of the 1960s firms is Finco Engineers, founded in 1969 by Engr. (Prof) V. A. Akinsete. He was joined by Engr. Dr. O. O. Ajayi and Engr. M. F. Ogedengbe as partners in 1973, and Engr. O. Adeyinka as principal partner in 1976; Engr. F. A. O. Phillips founded F. A. O. Phillips and Associates, which he ran for another 37 years until his death in January 2008; Unecon Associates was registered in 1969 but did not commence business until 1970.
In highway design, perhaps the best known firm is Etteh Aro and Partners, established by two senior engineers, E. I. I. Etteh and Arokodare in 1970; Enplan Group was at some point perhaps the largest consulting firm in Nigeria. It was formed by very senior engineers including Engr Charles Okonkwo, Dr. J.O Sonuga and Engr. E. O. Williams; Mrs Joanna Olutumbi Maduka was assistant lecturer at Ife from 1966 to 1970 when she resigned to join Leccom Associates, a firm of electrical and mechanical engineering consultants, as a senior engineer and later became the principal partner; Engr Ekundayo Adetunji Babaniji worked with Mandilas Limited in Lagos and Carrier International, Syracuse and Nigerian Institute of Management before establishing his own company, Kabeaco Associates Limited in 1970.
Engr. S. O. Fadahunsi worked with the Western Region Government in Lagos from 1963 to 1971 when he retired to found the firm of Comprehensive Engineering Consultants in partnership with Engr. J. O. Ibironke; Progress Engineers was established in 1971 by Engr. Dr. Joe I. Folayan, whose major achievements included attending twenty successive FIDIC annual conferences; Amana Consulting Engineers was founded by Engr. Edet J. Amana, a past president of ACEN and former vice president of the Academy of Engineering; Adeyemi Ogundipe & Partners was founded in 1972 by Engrs Benjamin Omotunde Adeyemi and Emmanuel Oluseye Ogundipe. They were joined as partners by Israel Olufela Oluyemi and Randolph Ademola Adu in 1975. In 1984, the firm split into two, AOP-Consult Limited in Lagos with Ogundipe, Adu and Adeola as partners, and Konsadem Associates in Ibadan with Engr. Adeyemi as the principal partner.
Although Sshwed was registered by Engr. Michael Olusegun Adesina in 1970, it did not commence business until 1972. He was joined by the second principal partner, Engr. O. O. Osinowo in 1973; organ Omonitan & Abe was another prolific structural engineering practice. Originally formed in 1972 as Morgan Omonitan & Associates, it became Morgan Omonitan & Abe in 1991 when it absorbed Engr. Dapo Abe as a partner; Vasons Concept was founded by two partners in 1973: Engr. Adeyemi Songonuga and Engr. R. Omokayode Soderu. The third partner, Engr. Victor Olusegun Oyenuga, joined the partnership in 1991; Molad & Molad was founded in 1973 by two senior engineers, Engr. Sunday Adegboyega Adigun and Engr. D. K. Omodara; Engr. Jimi Ashaye formed Landscope in 1976 with Lanre Sagaya who later resigned from the partnership.
E. S. Eigbokhan graduated with B. Eng. in electrical engineering in 1973; Engr Olumuyiwa Alade Ajibola worked with Etteh Aro and Partners. He resigned in 1976 to co-found Intecon Partnership. Dr. Olatunbosun Adefolaju worked with the firm of Adeyemi Ogundipe and Partners before resigning to co-found Intecon Partnership; Engr. Yunus Olanrewaju Sagaya has been a committed member of ACEN for several years and was its president from 2002 to 2003. He had worked in several firms including Ove Arup and Partners and Osot before founding Landscope with his colleague and friend in 1976. He resigned from Landscope in 1980 to found Yolas Consultants.
Segun Doherty was the honorary secretary of ACEN from 1985 to 1986 was an active and committed member of the association. He worked with the electrical firm of Kunle Okunoren & Partners before forming his firm, Dovates Associates Limited in 1991; Engr. E. C. Okeke was commissioned in the Nigerian Army Electrical and Mechanical Engineers (NAEME) Corps in 1964 and retired in 1971 as a Captain. He revived Mekon Associates, a firm he had formed in 1977, in 1991; Samaila Omale & Partners was founded in 1977 by two senior engineers, Habila Shehu Samaila and Omale.
Engr. (Major) E. B. U. Unuigbe voluntarily retired from the air force in 1975 and founded Interplan Engineers; Lanre Oyenekan founded the firm of Akintobi Oyenekan and Associates with his uncle in 1977. Engr. Akintobi was very active in NSE and ACEN. He resigned from the partnership in 1985 to establish his own firm, Lanre Oyenekan and Partners. In the area of hydraulics and harbour works, perhaps the best known firm was Adeoye Fowora and Partners, formed by Adeoye Fowora after resigned voluntarily Nigerian Ports Authority as Assistant General Manager in 1979; Ralph Eke was the honorary secretary of ACEN in 1990 and started his practice, Gomel Engineering Limited in 1979; Aim Consultant was founded by Engr A. I. Moussali in 1979.
Engr. E. C. Sogunro was ACEN treasurer for several years, worked in government and the private sector for several years, before founding Mecholect in 1980; Engroaconsult, a division of Engro Group Nigeria Limited, was founded by Engr. Olasupo Ademosu in 1980 and later joined as partner by Engr. Olawale Akinpelu; Engr. Kayode Adekoya joined an expatriate consulting firm, Gregory Stathopoulos and Partners and resigned in 1981 to found his own firm; Engr. Festus Alfred Oladimeji Oseni returned to Nigeria in 1973 and worked with the Highways Division of the Federal Ministry of Works till 1978. In April 1978, he transferred to the Federal Capital Development Authority. He retired voluntarily in 1981 and founded F. A. Oseni Consultancy Services.
Landmark was founded in 1982 by two engineers, Oreoluwa Fadayomi and Oluyomi Lawson; Lekan Ogunbayo and Debo Adeoye established McAdog & Associates in 1983 after over ten years as associate partners with Edison; Sani-Mustapha & Associates was founded in 1983 by Engr. Mustapha Bulama; PSE was established in 1984 as Prime Services Engineers. In 1993, it became a limited liability multi-disciplinary firm covering engineering, architecture and quantity surveying services. The chairman and managing director is Engr. M. I. Ufoeze; Delkem Associates was founded in 1984 by past president Mayen Modupeola Adetiba, the first female president of ACEN.
Kunle Ogunbayo and Associates was formed in 1985 by a past secretary of ACEN, Kunle Ogunbayo. Major projects carried out by KOA include Folawiyo Plaza in Apapa (1994), AP Plaza in Abuja (1992), Abuja Phase 11 infrastructures (1995); Ogunnowo-Bolaji founded Gomet Associates in 1986; CA Consultants Limited is a foremost electrical and mechanical engineering services company founded in 1987 by Charles Yele Akindayomi. The other directors of the company are Engr Wole Alli and Olaniyi Kehinde.
Integrated Engineering Associates was founded by three engineers, Suleiman Adamu, Hassan Kuliya Umar and Muhammad Nura Khalil; Uujamhan was a partner in a consulting engineering firm from 1981 to 1989 before establishing Osca-Jo in 1989; ENCON Associates is a civil engineering consulting firm founded by Engr. Paul Abiyou in 1989.
Afri-Projects Consortium was the initiative of a quantity surveyor, Salihijo Ahmad. In 1990, he conceived of a multi-disciplinary professional practice and invited four of his friends, Abdurrahman Dahiru, Nurudeen Rafindadi, Amina Ibrahim and Murtala Aliyu to join him to create APC; Tamiore Associates was registered by the founder, Engineer (Dr.) Temilola Kehinde in 1984 but did not commence business until 1992; Kabir and Associates was founded by Engr. Kabir Umar in 1995 and became a limited liability company in 2005.
Comprehensive Project Management Services Limited, CPMS, was founded in 1997 by Bayo Adeola as a wholly project management company. He had worked with the firm of Adeyemi Ogundipe and Partners from 1976 to 1984, and was a partner in the successor firm of AOP-Consult Limited from 1984 to 1997.