Jason Thorndycraft is to step down as operations director of Novus Leisure.
He will be replaced in his role by Bruce Beattie, who has worked with Novus for the past seven years in various roles.
Novus chief executive Steve Richards said: "Jason has played a major part in Novus's transformation over the past few years, which culminated in the successful sale last summer."
Meanwhile, the company is set to re-open five bars this month after making changes and investments in the sites.
Bar Soho in Old Compton Street will get carousel booths, while Verve in Upper St Martin's Lane and Jewel Piccadilly will feature a new cocktail menu. There will be new food menus at the Last on Shoe Lane in the City.
Novus was sold to LGV Capital and Hutton Collins for £100m in July 2012.