Tesla Chief Executive Elon Musk told employees to return to the office or leave the company, according to an e-mail sent to employees.
"Everyone at Tesla is required to spend a minimum of 40 hours in the office per week," Musk wrote in the e-mail sent on Tuesday night and seen by Reuters. "If you don't show up, we will assume you have resigned."
"The more senior you are, the more visible must be your presence," Musk wrote. "That is why I lived in the factory so much — so that those on the line could see me working alongside them. If I had not done that, Tesla would long ago have gone bankrupt."
Two sources confirmed the authenticity of the e-mail reviewed by Reuters. Tesla did not respond to a request for comment.
Most major tech firms in Silicon Valley are not requiring workers to return to the office full-time, in the face of resistance from some workers and a resurgence of coronavirus cases in California.
Tesla has moved its headquarters to Austin, Texas, but has its engineering base and one of its factories in the San Francisco Bay area.
"There are of course companies that don't require this, but when was the last time they shipped a great new product? It's been a while," Musk wrote in the e-mail. "Tesla has and will create and actually manufacture the most exciting and meaningful products of any company on Earth. This will not happen by phoning it in."
One of Musk's Twitter followers posted another e-mail that Musk apparently sent to executives asking them to work in the office for at least 40 hours per week or "depart Tesla."