American fast-casual restaurant chain Chipotle Mexican Grill has announced the retirement of its existing CFO Jack Hartung, effective 31 March 2025, following his 25-year tenure.

Since joining in 2002, Hartung played a crucial role in guiding Chipotle through challenges such as McDonald’s divestiture and a major contamination crisis.

Under Hartung’s financial leadership, Chipotle also became the largest US fast-casual chain by sales.

Adam Rymer, a 15-year veteran at Chipotle and currently finance vice-president, will succeed Hartung on 1 January 2025.

Rymer has been responsible for overseeing field finance, corporate finance, and investor relations.

Rymer will join Chipotle’s executive leadership team and report directly to Brian Niccol, the chairman and CEO.

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Hartung will maintain his role until the end of the year and will assist the company until March 2025 to facilitate a seamless transition.

Hartung said: “I started working with Chipotle when there were less than 200 restaurants, and with over 3,500 today, I’m confident Chipotle has a long runway of profitable growth ahead led by the best team in the industry.”

Additionally, Jamie McConnell will take on the role of chief accounting and administrative officer starting 1 January 2025, the company said.

In her new role, McConnell will be directly reporting to Rymer.

Niccol said: “Jack is one of the best CFOs in the business, and he has played an instrumental role in helping Chipotle deliver unprecedented growth while building our culture and multiple, strong teams with deep expertise.

“I’m also pleased to have Adam Rymer succeed Jack as CFO, which is a testament to our strong talent bench and thoughtful succession planning.”