John Hussman, president of Hussman Investment Trust, describes himself as an economist, a philanthropist, and a “realist optimist often viewed as a prophet of doom” on his Twitter profile. That last bit may be the one investors care about on Monday as the stock market shows signs of unraveling on the back of the tech sector’s stumble.

Hussman’s claim to fame includes forecasting the market collapses of 2000 and 2007-2008. Since then, however, he’s also become known as a permabear for his repeated calls for sharp stock market declines and his oft-repeated mantra of “overbought, overvalued, overbullish” as the bull market continues into its ninth year by some measures.

Hussman says he’s learned from and addressed past errors.

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