General Abayomi Gabriel Olonisakin was born on the 2 Dec 61 in Kaduna, but hails from Gboyin Local Government Area of Ekiti State. He began his military career as far back as 1973 as a soldier boy in Nigerian Military School Zaria. He was later admitted into the Nigerian Defence Academy and commenced cadet training on 3 January 1979, as a member of 25 Regular Combatant Course. Gen Olonisakin was later commissioned on 18 December 1981 as a Second Lieutenant and was posted to Nigerian Army Signals Corps.
In the course of his career, the General attended various military courses, attaining highly decent grades with several awards. The courses amongst others include; Young Officers Course (Signals), Young Officers Course (Infantry), Squadron Commanders Course, Communication Management Course and Commanding Officers Course (Infantry). Others include; Regimental Commanders Course; Junior Staff Course, Senior Staff Course as well as National War College (National Defence College).
In the field of Academics, he holds degree in Electrical and Electronic Engineering, BSc Electronic Engineering from the Obafemi Awolowo University Ile Ife, Diploma Electronic and Telecoms Engineering also from the Obafemi Awolowo University Ile Ife with specialties in Telecommunication Engineering, Power Engineering, Satellite Communications and Control.
The General also held various appointments in Command, Staff and Instruction appointments among which are; Director Nigerian Army System Development Centre Lagos, Director Department of Army Data Processing, Commander 51 Division Signals Kaduna and Commander 59 Division Signals Lagos.
He was Commandant Nigerian Army School of Signals, Commander Corps of Signals and until his current appointment, Commander Training and Doctrine Command (TRADOC ). The General also holds Staff appointments some of which are; Grade II Staff Officer Operations/Training (G2 Ops/Trg) Nigerian Army School of Signals and also Military Assistant to Commandant Armed Forces Command and Staff College. General Olonisakin was at one time an Instructor – Nigerian Army School of Signals, a Directing Staff, Armed Forces Command and Staff College as well as Aid- de- Camp To Governor Lagos/Ogun State
The General has equally participated in various operations home and abroad. Notable among the operations he has participated is United Nations Angola Verification Mission (UNAVEM III). During this period the Force Commander recognized him as a gentleman officer with sterling leadership qualities.
General Olonisakin is happily married and blessed with children. He loves reading, playing Badminton.