MINNEAPOLIS (WCCO) — After 18 months, Famous Dave’s CEO John Gilbert has resigned, according to a press release issued by the company on Monday.

Director Ed Rensi, former McDonald’s CEO, will take over as the company’s interim chief executive officer effective immediately.

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The news of Gilbert’s resignation is a sudden change for the company but no further details were released.

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In a December 2012 interview with WCCO, Gilbert talked about the business’ new approach with then-BBQ Shack prototypes. In his second month as CEO, Gilbert said they wanted to appeal to customers’ desire for “really high-quality food, really fast.”

Famous Dave’s has 54 locations and franchises 142 additional units in 34 states, the Commonwealth of Puerto Rico and one Canadian province.

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The company is headquartered in the Twin Cities.