Nigerian Leaders since Independence: Chief Olusegun Obasanjo (1999-2007)

Oluṣẹgun Mathew Okikiọla Arẹmu Ọbasanjọ, GCFR has ruled Nigeria as a military Head of State from 13 February 1976 to 1 October 1979; and as elected President from 29 May 1999 to 29 May 2007, following Abdulsalami Abubakar's transition programme. Since 2007 when he handed over to Umaru Musa Yar’Adua, Obasanjo has remained in active politics as Chairman, Board of Trustees of the ruling People’s Democratic Party, PDP until April 2012 when he resigned the position, citing personal reasons.

More on his political exploits as a military ruler are contained here 

In December 2008, he was appointed the United Nations special envoy to the Congo to mediate in the conflict in the Eastern Democratic Republic of Congo (DRC).

His current home is Abeokuta, the Capital City of Ogun State, where he is a nobleman as the holder of the titles of the Balogun of the Owu Lineage and the Ekerin Balogun of the Egba Clan of Yorubaland.

Source:http://en.wikipedia.org/wiki/Olusegun_Obasanjo

Nigerian Leaders since Independence: General Abdulsalami Abubakar (1998-1999)

General Abdulsalami Alhaji Abubakar (born June 13, 1942) was President of Nigeria from June 9, 1998 until May 29, 1999. He succeeded General Sani Abacha upon Abacha's death. Abubakar transferred power to President-elect Olusegun Obasanjo on May 29, 1999.

Abdulsalami Alhaji Abubakar hails from the Gwarii ethnic group and was born in Minna, Niger State. He was educated at Native Authority Primary School in that city, the Provincial Secondary School in Bida, and finally the Technical Institute, Kaduna. After this, he joined the Military. General Abubakar led Nigeria's contingent in the United Nations Interim Force in Lebanon and eventually rose to the role of Chief of Defence Staff. His wife's name is Fati and they have six children.

Nigerian Leaders since Independence: General Sani Abacha (1993-1998)

General Sani Abacha (20 September 1943 – 8 June 1998) was military ruler and politician. He ruled Nigeria from 1993 to 1998. A Kanuri from Borno by tribe, Abacha was born and brought up in Kano State. He attended the Nigerian Military School, Kaduna and Mons Officer Cadet School, Aldershot, England before being commissioned as a 2nd Lieutenant in 1963.

Political involvements
General Abacha took part in the countercoup of July 1967, from the conceptual stage, and might have been a participant in the Lagos or Abeokuta phases of the January 1966 coup. He was also a prominent figure in three coup d’etats of later decades, the first two of which brought and removed General General Muhammadu Buhari from power in 1983. When General Ibrahim Babangida was named President and Commander-in-Chief of the Armed Forces of the Federal Republic of Nigeria in 1985, Abacha was named Chief of Army Staff. He was later appointed Minister of Defence in 1990.
Abacha took over power from the interim government of Chief Ernest Shonekan, who was put into place by General Ibrahim Babangida after his annulment of the 12 June 1993.
Alleged human rights abuses.