Gov. Nathan Deal has promoted Deputy State Treasurer Steve McCoy to the top post and appointed a state senator to replace him.
McCoy replaces Tommy Hills, who announced his retirement last month.
McCoy has served as deputy state treasurer and chief investment officer since August 2011.
Republican Sen. Mitch Seabaugh of Sharpsburg will succeed McCoy. Seabaugh was first elected to the state Senate in 2000 and served most recently as the Senate's redistricting committee chairman. He is an accountant and works as a chief financial officer in Newnan.
Deal will issue the call Monday to set the date for a special election to replace Seabaugh on Nov. 8.
McCoy and Seabaugh begin their new duties Tuesday.