With over 30 years' experience in the construction industry, Mr Gash joins the company from Highways England where he was group leader and the senior responsible owner (SRO) for Major Projects South West.
He will be responsible for continuing Mott MacDonald's relationship with Highways England to deliver key aspects such as safety and project delivery.
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David Tarrant, highways managing director at Mott MacDonald, said: "Brian's appointment is a key part of our drive to continually improve communication and collaborative working to deliver better outcomes for our clients. His insight and experience will prove invaluable in strengthening our relationship with Highways England."
Mr Gash added: "One of the greatest challenges facing Highways England is delivering the substantial increase in investment on England's motorways and major A roads. I'm keen to develop ways in which we can work with them to realise their ambitions."
(LM/CD)
