Towner has worked as operations director for the London region of SES Engineering Services for the past three and a half years.
He has also previously held senior operational roles at Balfour Beatty Engineering Services and Lorne Stuart.
Towner said: “I’m excited to be joining the team in London after admiring the work they’ve done on projects such as Wood Wharf and London Bridge Station.”
NG Bailey also appointed Andrew French as director of ICT. He joins after three years as technology and IT director at MWH Treatment.
His role will see him overseeing the continued development and modernisation of the company’s ICT systems and infrastructure to maintain its position as an industry leader.