Mark Ferri, who has led the safe, successful deactivation and demolition work at K-25 since URS/CH2M Oak Ridge, LLC arrived in Oak Ridge in August 2011, is retiring at the end of February.
Ferri has accepted a CH2M Hill corporate opportunity in the United Kingdom.
He was part of the original handpicked leadership team by the company, also known as UCOR.
Leo Sain, UCOR president and property manager, said the company will use this opportunity to streamline its organization and gain efficiencies.