Some employees were afraid of him
Two former senior-level employees said people were scared to tell Musk they disagreed with him.
"Because of the pressure that he puts on his entire executive team, his senior leadership team, even if they have the experience, they wouldn't dare speak up against him," one of the former employees said.
A former manager who was on a number of phone calls with Musk last year said he believed Musk never learned his name, which he liked, because when someone's name came up for the first time during a conference call, that person would often leave the company shortly thereafter.
He's very smart
Multiple employees who worked or interacted with Musk noted his intelligence.
"He's highly intelligent. He's already 10 steps ahead of you" a former manager said. "You have to think 10 times more audacious than he does to be able to be successful."
If Musk liked your idea, he wouldn't hesitate to put it into action, the former manager added.
He makes his employees better
A former senior-level employee said that 90% of the time he disagreed with Musk, he later realized Musk was right.
"I feel like I'm 10 times smarter now than when I first joined," he said.
Read more: 9 ex-Tesla employees reveal the best parts of working there
He's very responsive to social media
Two former senior-level employees said Musk wouldn't hesitate to change a team's priorities if a customer's social media post caught his eye.
"What ultimately triggers him to act and make a decision is what he reads on social media," one of the former employees said. "When you're in a business meeting with him, he will pivot the direction of the organization literally overnight. So manufacturing could be a problem today, and as soon as it stops being reported on social media, as soon as it stops being reported in the news, then he'll move on to whatever the news is claiming the new problem is."
He didn't always give senior-level employees a lot of autonomy
Three former senior-level employees said Musk didn't give his senior leadership team much autonomy to make decisions.
"I think the level of autonomy that folks tend to have is nearly zero," one of the former employees said.
"There was only one decision maker at Tesla, and it's Elon Musk," another former employee said.
He has very high standards
A former manufacturing engineer said Musk had very high standards, which could lead him to discard someone's work and tell them to start over.
He sometimes took that impulse too far, the former Tesla engineer said, which increased costs and reduced efficiency, but the quality of Tesla's vehicles is a testament to Musk's perfectionism.
"Tesla is an engineer's paradise where the pencil is literally never down," the former Tesla engineer said.
He can set unrealistic goals
A former manager said Musk would sometimes set "unrealistic stretch targets without a realistic plan in order to achieve them."
"It's a culture in which, if you don't have a solution to a problem and you don't have that problem resolved within a few days or a week or two, you're gone," the former manager said. "So it's better to keep your mouth shut.
Musk has been known to make public predictions about areas like Tesla's financial performance, autonomous-driving technology, or production targets that the company has not met on his original timeline.
When he gives his attention to a project, it can be good and bad
A former senior-level employee said that while Musk was good at removing obstacles and building momentum behind an initiative, his presence also put employees on edge and could damage projects outside of his area of focus.
The former employee compared Musk's attention to the Eye of Sauron from "The Lord of the Rings."
He thinks outside of the box
"He thought way outside the box," said Mitchell Stephens, a former senior manufacturing engineer who worked at Tesla from 2010 to 2012.
Stephens said the first time he met Musk, the Tesla CEO asked him and a group of his coworkers what they saw when they looked at a soda can. According to Stephens, Musk said he saw a spaceship if you multiplied the soda can's size.
He's very energetic
A former engineering manager said Musk was energetic, adding that his energy level was "very contagious."
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