Ron Jeffries has been developing software since 1961, when he accidentally got a summer job at Strategic Air Command HQ, and they accidentally gave him a FORTRAN manual. He and his teams have built operating systems, language compilers, relational and set-theoretic database systems, manufacturing control, and applications software, producing about a half-billion dollars in revenue, and he wonders why he didn't get any of it. For the past few years he has been learning, applying, and teaching Extreme Programming, teamed with Kent Beck, Ken Auer, Ward Cunningham, and Martin Fowler.
