McKillop has held the position since July 2000 and joined STRI from, what was then, the Central Science Laboratory (CSL), a DEFRA Agency.
McKillop considers himself to have been incredibly lucky to have been able to manage a business such as STRI, to have been behind the scenes of many sporting events at local, national and international levels and to have worked as part of a dedicated, knowledgeable and incredibly enthusiastic team.
"When I started, I told the interview panel that I had three aims for the business: to develop more scientifically and technically based services, to make the business more commercially orientated and to raise the STRI brand to an international level. I am pleased to look back and know I have taken the business some way down each of these three roads."
Highlights from his term in office include growing the core UK business during the recession and winning contracts with UEFA, FIFA and the London Olympics, as well as establishing STRI in Australia.
McKillop will be succeeded by Mark Godfrey, who has been with STRI for 10 years and is currently STRI's Financial Director and Managing Director of STRI in Australia; he will return from Australia in December.