Even today Boeing is run by a Welch disciple. Dave Calhoun, the current C.E.O., was a dark horse candidate to succeed Mr. Welch in 2001, and he was on the Boeing board during the rollout of the Max and the botched response to the crashes.

When Mr. Calhoun took over the company in 2020, he set up his office not in Seattle (Boeing’s spiritual home) or Chicago (its official headquarters), but outside St. Louis at the Boeing Leadership Center, an internal training center explicitly built in the image of Crotonville. He said he hoped to channel Mr. Welch, whom he called his “forever mentor.”

The “Manager of the Century” was unbowed in retirement, barreling through the twilight of his life with the same bombast that defined his tenure as C.E.O.

He refashioned himself as a management guru and created a $50,000 online M.B.A. in an effort to instill his tough-nosed tactics in a new generation of business leaders. (The school boasts that “more than two out of three students receive a raise or promotion while enrolled.”) He cheered on the political rise of Mr. Trump, then advised him when he won the White House.

In his waning days, Mr. Welch emerged as a trafficker of conspiracy theories. He called climate change “mass neurosis” and “the attack on capitalism that socialism couldn’t bring.” He called for President Trump to appoint Rudy Giuliani attorney general and investigate his political enemies.

The most telling example of Mr. Welch’s foray into political commentary, and the beliefs it revealed, came in 2012. That’s when he took to Twitter and accused the Obama administration of fabricating the monthly jobs report numbers for political gain. The accusation was rich with irony. After decades during which G.E. massaged its own earnings reports, Mr. Welch was effectively accusing the White House of doing the same thing.

While Mr. Welch’s claim was baseless, conservative pundits picked up on the conspiracy theory and amplified it on cable news and Twitter. Even Mr. Trump, then merely a reality television star, joined the chorus, calling Mr. Welch’s bogus accusation “100 percent correct” and accusing the Obama administration of “monkeying around” with the numbers. It was one of the first lies to go viral on social media, and it had come from one of the most revered figures in the history of business.

When Mr. Welch died, few of his eulogists paused to consider the entirety of his legacy. They didn’t dwell on the downsizing, the manipulated earnings, the Twitter antics.

And there was no consideration of the ways in which the economy had been shaped by Mr. Welch over the previous 40 years, creating a world where manufacturing jobs have evaporated as C.E.O. pay soars, where buybacks and dividends are plentiful as corporate tax rates plunge.

By glossing over this reality, his allies helped perpetuate the myth of his sainthood, adding their own spin on one of the most enduring bits of disinformation of all: the notion that Jack Welch was the greatest C.E.O. of all time.

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