Born on 28 February 1956, to Harry Goonatilake and Marian Perera, he had a younger brother and two sisters. Goonatilake completed his education at St Peter's College, Colombo, where he excelled in both studies and sports.
Air Force career
He followed his father by joining the Sri Lanka Air Force as an Officer Cadet in the General Duties Pilot Branch on 13 January 1978. On successful completion of flying training, he was commissioned in the rank of Pilot Officer on 24 August 1979. Having logged many flying hours both in fixed and rotary wing aircraft serving as an operational pilot, he served as the Commanding Officer of No. 03 Maritime Squadron and No. 04 Helicopter Wing. He functioned as the Zonal Commander in both Northern and Eastern Zones, and commanded Air Force Bases Katunayake, Anuradhapura and China Bay. Goonetileke graduated from the Air Command and Staff College, Air University in 1994 and attended National Defence College in Pakistan in 2001. He functioned as Director Operations, Deputy Chief of Staff Operations and Chief of Staff, prior to being appointed the Commander of the Air Force on 12 July 2007. On 18 May 2009, he was promoted Air Chief Marshal, becoming the first ever serving Officer of the Sri Lanka Air Force to be promoted to four star rank. He was admitted to the Degree of Doctor of Philosophy by the University of Kelaniya on 20 November 2009, in recognition of his professional achievements as the Commander of the Air Force. He is also a Honoury Fellow of the Institute of Management in Sri Lanka.
He was appointed as Acting Chief of Defence Staff on 16 November 2009 and was confirmed as Chief of Defence Staff on 28 February 2012 upon relinquishing Command of the Sri Lanka Air Force. He was appointed Chairman Board of Management of Civil Aviation Authority of Sri Lanka with effect from 5 October 2009 until relinquishing duties on 28 December 2011. He was also appointed as Chairman of Waters Edge Ltd, a government-owned, multi-facility recreational and hospitality complex.
Personal life
Goonetileke is married to Mrs. Nelun Goonetileke. They have a son and a daughter, Rehan and Ronali. Rehan, followed the family tradition becoming a Helicopter Pilot. An avid sportsman, Goonetileke was heavily involved in the development of Sri Lanka Rugby, as the President of the Sri Lanka Rugby Football Union, serving two successful terms from 1 June 2010 to 11 January 2012.