Simpson, who has been with Columbia since 1999, followed Charlie Walk who recently moved from the Columbia Records Group to become Epic's president, Billboard.com noted. Both companies are under the Sony umbrella.
"Charlie Walk was my first hero at Columbia," Simpson told Billboard. "He believed in me before I really even got to meet the rest of the company. I couldn't think of anyone I would trust more than Charlie to present my new music to the world."
Simpson is recording her follow up to 2003's "In This Skin."
A source told Billboard.com an R&B single from the new set is "not far away at all" -- with an eye toward the album being out by year's end.