Air Chief Marshal Oluseyi Petinrin was born on 19 January, 1955 at Ipetu-Ijesa in Ori-Ade Local Government Area of Osun State. Air Marshal Petinrin enlisted into the Nigerian Defence Academy (NDA) in 1974 as a member of Regular Course 16 and was commissioned Pilot Officer on 3 January, 1977. He was the Nigerian Air Force's Chief of the Air Staff from 2008 to 2010. He was appointed Chief of the Defence Staff and served from 2010 to 2012.