DETROIT — Nine months after he was brought aboard to steer the American Center for Mobility into its next chapter, Michael Noblett is no longer the organization’s CEO.

Without saying whether Noblett was fired or he resigned, officials at the autonomous-vehicle proving ground said Monday that COO Mark Chaput is now interim CEO as a “national search is carried out” to find Noblett’s successor.

This will be the second such search in less than a year. Noblett was hired in February following a protracted hunt for an executive who could elevate ACM’s profile and attract more companies interested in using the autonomous- and connected-vehicle testing facility.

Prior to joining the proving ground, Noblett took a 1-year, 9-month sabbatical, according to his LinkedIn profile. Before that break, he had executive stints at IBM and Intel, which each lasted one year and three months. He was at IBM for six years overall.

ACM officials were tight-lipped this week regarding his departure, which was announced at a meeting of the organization’s board last week. A spokesperson for ACM did not return a request for comment, nor did board Chairwoman Cynthia Wilbanks. Noblett also did not respond.

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