If you ever used Laplace transforms to solve differential equations, that is Heavisides work too.

Good book: http://www.amazon.com/Oliver-Heaviside-Electrical-Genius-Vic...

For those interested in the history and mathematical development of Maxwell's Equations as we know them today, Paul J. Nahin's book on Heaviside[1] is a must read.

[1] http://www.amazon.com/Oliver-Heaviside-Electrical-Genius-Vic...

The following two books are a fascinating look at Heaviside's contributions and extraordinary life:

http://www.amazon.com/Maxwellians-Cornell-History-Science/dp...

http://www.amazon.com/Oliver-Heaviside-Electrical-Genius-Vic...