DENVER — Greg MacDonald has been promoted to chief executive officer of the quick-service chain Quiznos. He replaces company founder Rick Schaden, who will remain chairman of the company.

Mr. MacDonald was most recently president of the company. He has worked with Quiznos for the past 12 years.

“Greg brings unparalleled brand and industry knowledge to this role as well as a targeted focus on company success through exemplary operations,” Mr. Schaden said. “Greg has the support of Quiznos’ board, shareholders and franchise owners. We are confident in his ability to execute a sound strategy for even greater company success.”