Market Basket’s board of directors named the grocery store chain’s chief financial officer as its interim chief executive officer, less than a week after it fired longtime CEO Arthur T. Demoulas .

Donald T. Mulligan has worked at Market Basket for more than four decades, slowly rising through the ranks before being promoted to chief financial officer in 1999, Board Chair Jay K. Hachigan said in a statement.

“Don Mulligan is the voice of consistency at Market Basket,” Hachigan said. “The Board has worked closely with Mr. Mulligan and has come to appreciate his exceptional business acumen, the respect and admiration our associates have for him, and his deep understanding of the history and culture that make Market Basket so special.”

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