<P>This book, first available in 1994, was published to commemorate the one-hundredth anniversary of Heinrich Hertz's death at the terribly young age of thirty-six. The introductory biography together with eleven papers by Hertz and seven about him are intended to highlight the importance of Hertz's contributions to physics and at the same time to serve the needs of anyone interested in doing research on this highly gifted scientist. </P>