6. THAI LEE

$4.1 billion  SOURCE: IT provider AGE: 62 RESIDENCE: Austin, TX SELF-MADE SCORE:  Her $11 billion (2020 sales) IT provider, SHI International, is cashing in on increased demand for remote-work technology, with sales up 4% year to year. A South Korean immigrant, Lee cofounded SHI in 1989 with her now ex-husband after purchasing a struggling software reseller for less than $1 million. She remains CEO of SHI and has a minority stake in biopharmaceutical developer VBL Therapeutics.