Miller joined Couche-Tard in 2012 as director of fuels, real estate and facilities, moving into increasingly progressive roles across the company.
He was promoted to the newly created COO position in January 2023. At the time, Miller's role was to oversee the company's North America, Europe and Asia operations, including its food program, merchandise procurement and supply chain activities.
Prior to that, Miller had been the company's executive vice president, operations North America and global commercial optimization.
"By bringing together all the operational reporting lines under the chief operating officer, the regional teams can more easily align operations to extract further synergies and learnings at the core of our business," Hannasch said at the time. "Alex is uniquely positioned to take on this new role with his impressive leadership experience in convenience and fuel operations as well as his extensive contributions growing the business across all our geographies."
While Hannasch's retirement is effective Sept. 6, he is staying on as a special adviser to Miller and will serve as executive chair of the company's board.