Clegg, 88, has worked on engineering projects around the world, including in Egypt, Poland and Romania.
For the last 26 years he has worked at CSG’s Cadishead base as an engineering consultant, during which time he oversaw the construction of processing plants in Glasgow, Bromborough, Plymouth and Middlesbrough.
Reflecting on his retirement, Clegg – who is a member of the Institute of Chemical Engineers, Institute of Mechanical Engineers and a senior member of The Welding Institute - said: “I have had a great career and I’ve enjoyed almost all of it.
“My time at CSG – or Lanstar Holdings as it was when I started before the buy-out – has been brilliant. I have project managed some very interesting projects and every job has been different.
“CSG has really looked after me over the years. I’ve been allowed to use my expertise without micromanagement, but they’ve always stepped in when I’ve needed help.
“The business has completely changed over the years. It’s much better managed now and it’s been a pleasure to see the business grow and develop.
Clegg’s engineering journey began as an apprentice at Metropolitan-Vickers in 1951.
Clegg’s National Service was deferred until he was 23 as he was engaged in an apprenticeship and night school, but eventually the red letter did drop through his door and he joined the Merchant Navy, stationed in Liverpool.
“I can’t say I was looking forward to National Service so I joined the Merchant Navy and that turned out to be a good experience serving on ships around the Caribbean, Peru, El Salvador and the Mediterranean,” said Clegg. “I was actually in Havana in Cuba when Fidel Castro took control, which was an experience.”
After his stint in the Merchant Navy, Roger worked for Pilkington Brothers in St Helens, during which time he was briefly prime suspect in an FBI investigation into leaked design plans due to his recent spells in Cuba and Yugoslavia.
He moved to Petrocarbon Limited in Manchester, during a period when the company was involved in the design of the Carrington chemical plant, and later worked for Matthew Hall Engineering, BiWater and Huntsman before making his final move to CSG.
Neil Richards, managing director of CSG, said: “Roger has been an incredible member of the team, bringing extraordinary knowledge and leadership over 26 years.
“CSG has always been built around people like Roger, who knows the industry inside out. He will be missed by us all and we wish him well as he begins his retirement.”
CSG employs more than 650 people nationally, supporting a national network of waste treatment and recovery centres.