"Elon Musk is an absolute rock star because he is not beholden to anybody," Simmons told TheStreet (TST . Simmons said he appreciates Musk's bold ideas on space, solar power and electric cars.
"I am a big fan," Simmons added.
Musk could use some fans beyond the music industry.
Tesla shares have plunged 11% this year on fears of mismanagement by Musk and a likely capital raise to support the Model 3 roll-out.
According to Goldman Sachs analysts, Tesla Inc. needs to raise a ton of money -- and fast.
Schwall's departure comes hot on the heels of Tesla's senior vice president of engineering Doug Field deciding to step away from the company to spend more time with his family.