Former Sonic executive to become the Argonne Capital-owned burger chain's new president and CEO.

Omar Janjua will become president and chief executive officer for The Krystal Company, a burger chain with more than 350 locations, effective January 21. He most recently served as president for Sonic Restaurants and chief operations officer for Sonic Industries. 

Prior to Sonic, Janjua served as executive vice president and chief operating officer for The Steak 'n Shake Company and spent 18 years with YUM! Brands, Inc. in its Pizza Hut operations.