Carlsbad-based Rubio’s Inc. has appointed Marc Simon to the post of president and chief executive officer. The move followed the resignation of Daniel Pittard, who led the company for nearly five years.

No reason for Pittard’s exit was disclosed in a company statement on April 29. Pittard will remain on Rubio’s board of directors.

“We are deeply grateful to Dan for his fine leadership and accomplishments in helping strengthen the company while CEO of Rubio’s,” said company co-founder Ralph Rubio.

Simon had served as the company’s chief operating officer since September 2009 and was its senior vice president of operations from November 2007 to September 2009.

From 1994 to 1998, he served as vice president of corporate development at McDonald’s, where he helped identify, negotiate and complete McDonald’s first non-hamburger investment, Chipotle Mexican Grill.

He subsequently joined Chipotle as a regional director and developed key markets including Chicago, Minneapolis and Wisconsin, opening 144 new units. Before Rubio’s he also served as CEO of America’s Incredible Pizza Co.

The privately held Rubio’s operates, licenses or franchises more than 200 restaurants in California, Arizona, Colorado, Utah and Nevada.

— Lou Hirsh