The South African who dropped out of university, joined the military, and then became a billionaire
Isaias (Zak) Calisto dropped out of university twice and completed compulsory military service before building a technology company that has made him a billionaire.
By Malcolm LiberaSouth Africa
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Isaias (Zak) Calisto dropped out of university twice and completed compulsory military service before building a technology company that has made him a billionaire.
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About this article
- Length
- 24 words · 1 min read
- Published
- October 25, 2026
- Byline
- Malcolm Libera
- Source
- BusinessTech