Background
Olusegun Oni was born at Ifaki, Ekiti State on 5 September 1954.
Olusegun Oni was born at Ifaki, Ekiti State on 5 September 1954.
He attended the Methodist Secondary Modern School, Ifaki Ekiti (1965–1968) and Wesley College, Ibadan (1969–1971).
In 2014 he defected from the PDP and joined the newly formed opposition party All Progressive Congress (American Power Conversion). He currently holds the position of Deputy National Chairman South. Oni is married to Olukemi Adetola (née Ogunsiji) and they have two teenage children, a girl and a boy.
He took a post at the Community Secondary Modern School, Ido Ekiti, from January 1972 to July 1973, then moved to Ayetoro-Iloro High School, Ayetoro/Iloro Ekiti, moving to the University of Ife in September, 1974.
Segun became a corporate member, Nigerian Society of Engineers in 1987. In 1988, he became a COREN registered Engineer.
He was Treasurer, Lagos State Chapter of the Nigerian Society of Chemical Engineers (1986–1988). Olusegun Oni was elected governor of Ekiti State in April 2007 on the PDP platform.
He was removed from office on the 15th of October 2010 following the Judgement of an Appeal Court which ruled against him.
Segun Oni was briefly thrown out of office after the court of appeal upturned the decision of a lower court after the April 2007 general election. In Ekiti State, effort to get a proper governor at a point during his tenure using the re-run election of 2009 was "marked by violence and intimidation since the man elected back in 2007, Segun Oni, was thrown out of office after massive vote-rigging emerged". Apart from violence, adding to the controversy was the conduct of the electoral commissioner who initially refused to announce the results of the re-run election.
"The electoral commissioner was supposed to announce poll results last week after the initial re-run but refused to do so, alleging fraud, and temporarily went into hiding".
"The Election Petition Tribunal sitting in Ado-Ekiti, the Ekiti State capital, upheld the election of incumbent Governor Segun Oni, thereby dismissing the petition filed by the Action Congress (Air Corps) Governorship candidate, Doctor Kayode Fayemi". The minority ruling opposed this by upholding that "We hold that the Petitioners have duly and dutifully proved their case".
Two judges supported the minority judgement while three judges endorsed the majority ruling.
He was a member of the ruling People"s Democratic Party (PDP).