DENVER — Stuart K. Mathis has joined Quiznos as president and chief executive officer, effective July 30. He succeeds Greg MacDonald, who is stepping down effective immediately.

Mr. Mathis, who has served as a member of the International Franchise Association’s board of directors since 2007, has more than 30 years of experience in franchising, operations and administration. He most recently was president of The UPS Store network, a position he held for 10 years.

Prior to The UPS Store, Mr. Mathis was executive vice-president of operations at Mail Boxes, Etc., the predecessor brand to The UPS Store. Earlier, he was executive vice-president of franchise operations at Domino’s Pizza.

“We are fortunate to have a leader of Stuart’s caliber join the Quiznos team,” said Harsha V. Agadi, executive chairman at Quiznos. “The depth of his experience in retail, restaurants and franchising uniquely qualifies him to lead this organization and move Quiznos forward. Stuart has worked with brands in times of change, and he has consistently improved their performance.”

Additionally, Susan Lintonsmith has been named Quiznos new chief marketing officer. Ms. Lintonsmith brings more than 20 years of experience in marketing and sales to Quiznos. Previously, Ms. Lintonsmith was senior vice-president and c.m.o. of Red Robin Gourmet Burgers. She also has consulted for the Einstein Noah Restaurant group and has held marketing leadership roles at WhiteWave Foods, Western Union, The Coca-Cola Co., and Pizza Hut Inc.

“Susan is an accomplished marketer who understands the importance of brand building to growing sales and profitability,” Mr. Agadi said. “She is an experienced executive who brings strategic vision and a relentless drive for continuous business improvement.”