Timeline

Major periods in my work have been:

• 1974-1980: particle physics and cosmology

• 1979-1981: developing SMP computer algebra system

• 1981-1986: cellular automata etc.

• 1986-1991: intensive Mathematica development

• 1991-2001: writing this book

(Wolfram Research, Inc. was founded in 1987; Mathematica 1.0 was released June 23, 1988; the company and successive versions of Mathematica continue to be major parts of my life.)