MILFORD, CONN. — Trevor Haynes, chief business development officer, has been named interim chief executive officer of Subway. He will succeed Suzanne Greco, who has informed the quick-service restaurant chain of her intent to retire on June 30.

Mr. Haynes is an experienced leader with deep knowledge of the company and has held numerous leadership roles at Subway since joining the company in 2006 as territory manager in Australia. He moved to the United Kingdom in 2009 to serve as the senior area development manager for the U.K. and Ireland and in 2014 joined the team in Milford to serve as the global director of operations.

He received a master’s degree in international management from Queensland University of Technology.

Following her retirement, Ms. Greco will become a senior adviser to the company. She joined Subway in 1973 as a “sandwich artist” and would later spend more than two decades as part of the research and development team. She facilitated the creation of the Independent Purchasing Cooperative (IPC) in 1996 to handle the Subway brand’s product purchasing. In 2013 she was promoted to vice-president of operations and research and development in 2013 and was named chief executive officer in 2015.

She received a bachelor’s degree in business administration from Sacred Heart University in Fairfield, Conn.

“We would like to express our deep appreciation to Suzanne for her lifetime of service in building Subway into one of the world’s greatest successes,” Subway’s shareholders said in a statement. “She was there when the first sandwich shop opened, and as c.e.o. she focused on helping the company adapt to a more competitive and dynamic environment. As we work with Suzanne on a smooth transition for the business we cherish, we are grateful for her extraordinary contributions and her insightful and dedicated leadership.  We are optimistic about the brand and look forward to working with the next c.e.o. to ensure a robust future for the company.”