Yocum will be responsible for Harsco's liquidity management, capital market activity, global treasury operations, and relationships with banks and rating agencies, according to the company.
"Filling this position now with someone of Bob's considerable experience ensures uninterrupted continuity and focus in this key area of our financial leadership structure," Barry E. Malamud, Harsco's vice president and interim chief financial officer, said in a statement.
Yocum has worked for Harsco in its treasury and finance departments since joining the company in 1981, and since 2001 as its assistant treasurer. Yocum has a bachelor's degree from Grove City College and an MBA in accounting from Penn State.
Yocum moves up to fill the spot formerly occupied by Malamud. He moved into the CFO position in November after the resignation of Stephen J. Schnoor.
CEO Patrick Decker said at the time the company needs a leadership overhaul to improve the company's overall position and return to shareholders.
Harsco, based in Wormleysburg, trades its shares on the New York Stock Exchange under the ticker symbol HSC.