Jim Arnold took up the position on 1 June.
Mr Arnold joined MUS in 1998 as an Area Manager before being appointed a Director in 2000.
He became Executive Director in 2009 and a Group Board Director in 2013.
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Charles Morrison, Chief Executive of Morrison US, said: "Jim has been a key member of our senior management team during a sustained period of significant expansion.
"Over the last 18 months, Morrison Utility Services has secured a number of new clients and, equally importantly, we have retained our existing client base, resulting in a record order book.
"As a result, we are now moving into a period of increased focus on operational delivery and, with over 25 years of construction and utility sector experience, Jim’s appointment will strengthen our operational capability."
(LM/MH)
