Tesla Inc. has parted methods with Jerome Guillen, a 10-year veteran who most not too long ago served as president of heavy trucking and was one of four top executives running the company together with CEO Elon Musk.

Guillen left the corporate June 3, based on a regulatory submitting Monday. He was a prime lieutenant to Musk and the brains behind the ramp up of Mannequin 3 manufacturing in 2018. The chief beforehand served as president of Tesla’s automotive enterprise, and was named head of heavy trucking in March of this 12 months.

“We thank him for his many contributions and want him effectively in his future profession,” the electrical carmaker mentioned within the submitting.

Guillen joined Tesla within the fall of 2010 as this system director for the Mannequin S, the breakthrough electrical automobile which laid the groundwork for the crossover Mannequin X and extra mass market Mannequin 3 that adopted.

Tesla has struggled with govt turnover for years. Guillen took a several-months-long leave of absence from the company in 2015 however returned in 2016 to guide the corporate’s Semi truck program. He didn’t instantly reply to a request for remark.