Mike Okhai Akhigbe (September 29, 1946 - October 13, 2013) was a vice admiral in the Nigerian Navy who served as "de facto" Vice President of Nigeria (as Chief of General Staff) during the General Abdusalami Abubakar led military government from 1998 till the termination of military government in Nigeria, in 1999.
 He served as Military Governor of Nigeria's Ondo State from 1985 to 1986, and Military Governor of Lagos State from 1986 to 1988, after which he was appointed Chief of Naval Staff, the highest-ranking officer of the Nigerian Navy, and subsequently the Chief of General Staff, the highest-ranking military officer of the Federal Republic of Nigeria Armed forces.
 He died in the US on 28 October 2013 after suffering from cancer for a few years.
Vice Admiral Ibok-Ete Ekwe Ibas is the current and 22nd Chief of Naval Staff (CNS) of the Nigerian Navy.
 He was appointed to the position on July 13, 2015 by President Muhammadu Buhari.
Patrick Sebo Koshoni (April 17, 1943-) is a retired Nigerian Navy Vice Admiral, former Chief of Naval Staff and a former minister for Health during administration of General Buhari.
 During his tenure as health minister, he tried to kick start a national insurance scheme, the scheme involved medical treatment without down payment.
Akintunde Aduwo (June 12, 1938 - ) is a retired Nigerian Navy Vice Admiral who served as Chief of Naval Staff from 1980 to 1983 and as Military Governor of the Nigerian Western State from July 1975 to February 1976 during the military regime of General Murtala Muhammed.
Mohammed Indimi is a Nigerian based businessman.
 He founded Oriental Energy in 1990, of which he is still chairman.
 He is a former in-law of former Nigerian president and retired Nigerian Army general Ibrahim Babangida and a current inlaw to Nigerian president Muhammadu Buhari.
Major General Raymond Matthew Dumuje (rtd.)
 "OFR, fss, mni, psc, BEM" (June 24, 1929 – May 9, 2008) was a prominent Nigerian Army officer and businessman.
 He became the first Quartermaster general of the Nigerian Army.
 On February 13, 1976, as a Colonel, he was shot and wounded in Ikoyi, Lagos during the failed "Dimka coup" attempt that saw the assassination of the then Military President, General Murtala Ramat Mohammed.
 The history of the Nigerian Armed forces records this particular event as a mistaken identity for Lt-General Olusegun Obasanjo, the then Chief of Staff of the Nigerian Army.
 He was one of very few to have served both in the Nigerian Army and the Nigerian Air Force.
 He was also a prominent indigene of the "Udu clan" in Delta state.
 He retired as the Director General, Nigerian Army, Army Reserve and Recruitment, in January 1984.
Rear Admiral (rtd) Mohammed Alabi Lawal (1946 – 15 November 2006) was a Nigerian naval officer who was military governor of Ogun State between December 1987 and August 1990 during the military administration of General Ibrahim Babangida.
 He was instrumental to the establishment of Nigerian Navy Secondary Abeokuta.
 The then Navy Captain Mohammed Lawal, invited the Nigerian Navy to consider a location of the defunct St Leo's Teachers' Training College at Ibara Abeokuta (www.nnssab.net)on a hilly Onikolobo site.
 This premises had been abandoned and merely serve as a route to the Catholic Compound and was also used for administering a newly conceived secondary school in that name.
 The Nigerian Navy considered the site and found it suitable.
 After the return to democracy in 1999 he was elected governor of Kwara State, holding office from 29 May 1999 to 29 May 2003.
Muhammadu Buhari {'1': ", '2': ", '3': 'GCFR', '4': "} (born 17 December 1942) is the President of Nigeria, in office since 2015.
 He is a retired major general in the Nigerian Army and previously served as the nation's head of state from 31 December 1983 to 27 August 1985, after taking power in a military "coup d'état".
 The term Buharism is ascribed to the Buhari military government.
Suleiman Saidu is a retired Nigerian Navy Rear Admiral who served as Chief of Naval Staff from September to November 1993.
Vice Admiral Joseph Edet Akinwale Wey (1918 – December 12, 1991) was a Nigerian naval officer who served, at various times, as head of the Nigerian Navy (i.e. Chief of Naval Staff), acting Foreign Minister, and Chief of Staff of the Supreme Headquarters, making him the "de facto" Vice President of Nigeria during Yakubu Gowon's regime.

Question: Who is the retired Nigerian Army general whom eventually appointed the vice admiral, Ibok-Ete Ekwe Ibas, to Chief of Naval Staff (CNS) of the Nigerian Navy?
Answer: Muhammadu Buhari