Huffington criticized Musk's "hardcore" approach to work after four weeks at the micro-blogging site.
In an opinion piece published in The Information on Tuesday, the businesswoman and author decried Musk and former FTX chief executive officer Sam Bankman-Fried as burnout deniers, suggesting their intense, around-the-clock attitudes towards work have negatively affected their employees and companies.
Huffington wrote that Musk's first month as CEO has been marred by "stunning mistakes" and "mass defections." Less than half of the company's remaining employees signed up for Musk's vision.
Huffington said that Musk is showing the drawbacks of a model fueled by burnout and lack of sleep in his own decision-making.
Emails from his early days at the company date back years. Musk's "hardcore" language was back in use.
Musk told employees in a late-night email that he would be working long hours. It will be a passing grade if there is exceptional performance.
Staffer's mass rebuke of Musk's ultimatum shows that employees no longer feel like they have to tolerate this approach to work.
Musk did not reply immediately.
Bankman- Fried was pointed to as a "burnout-denier" by the Huffington Post co- founder.
Insider previously reported that the former CEO of the exchange slept only four hours a night on a beanbag chair next to his desk.
Bankman-Fried's world came crashing down around him earlier this month when FTX was forced to file for Chapter 11 bankruptcy after the company failed to secure a bail out, and a report that the exchange had transferred billions of dollars of client funds to Bankman-.
Huffington warned CEOs to resist the temptation to crack down on already stressed employees as the economy tightens.
Huffington said that we still have a lot of work to do for our culture to fully catch up to the science of how we perform at our best and thrive in all aspects of our lives. "Ironically, Musk's actions over the past few weeks have brought us closer to finally debunking the belief that burnout is the price we have to pay for peak performance"