Robertson makes the key appointment as it transitions from being a family-run business to a family of businesses under a group structure.
With a geographical spread across the UK through eight regions, major projects, civils business and a specialist roofing and rendering division, Robertson Construction turned over £462m last year delivering projects across a variety of sectors.
Keillor joins Robertson following 32 years in the construction industry spent with BAM, latterly as the executive director for BAM Construct and BAM Construction.
He joined BAM in 1990 as a trainee when it was known as GA in Scotland.
Keillor spent much of his career in Scotland becoming regional director in 2013 and then joining the BAM Construction board in 2006 where he led the regional construction businesses.
Keillor said: “Joining the business as the new construction group board is being established presents the opportunity for me to work with the Robertson Group Board to continue to drive the business forward as it further strengthens its offer of providing market-leading sustainability and efficient construction solutions for our customers in the UK marketplace.
“I am very much looking forward to being part of a business where there is a great focus on being people centric and to working with our customers and supply chain.”
Elliot Robertson, chief executive officer, Robertson Group, said: “Doug joins us at an important time in our business as we make the transition from being a family business to being a family of businesses.
“The transition is necessary to enable to the group board to support our strategic vision of assuring a sustainable future through our plans for long-term growth which are underpinned by the competitive advantage we have due to the strength of our balance sheet.
“Doug has a wealth of experience and is a well-respected figure in the industry, he shares our desire to safely deliver quality projects for our customers. With customer centricity and people at the centre of his priorities, Doug will be a great asset to Team Robertson, and we are pleased to have him join our senior team.”