Arthur Whitney Alive
Created K, Q, and the kdb+ database — APL-descended array languages that run much of high-frequency finance.
1960198020002020
Created K
Wrote APL interpreters, then created k (1993) and kdb+ — the terse, brutally fast time-series language and database that run most of Wall Street's data.\n\nThe most commercially successful array language nobody outside finance has heard of; b was his earlier dialect.