Francis Anthony (Tony) Dahlen passed away on 3 June 2007, in Princeton, New Jersey. Tony was an extraordinary theoretical geophysicist whose broad research interests encompassed the Earth's free oscillations, the energy budget of earthquakes, the mechanics of accretionary wedges, the Chandler wobble, surface waves, mode-ray duality, body waves, and, most recently, geophysical inverse theory. His publications are of an unmatched elegance and clarity and have had a profound, lasting influence on geophysics.

Tony was born in 1942 in American Falls, Idaho, and grew up in Winslow, Arizona. He was exceptionally talented in physics and mathematics, which earned him a Sloan...

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