Seth Shostak
Senior Astronomer: SETI Institute 
Host: Big Picture Science radio show and podcast
Author: Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence

How will humanity first discover ET Life?
Best guess: Technosignature
Details: Large technological structures will be discovered in the next 20 years, analogous to the ancient Egyptian pyramids.
Unlike signals, artifacts are always present, even when those who have built them may have disappeared.

Credits for video images 
NASA planet imagery
NASA, Mars Rover
NASA, Cassini Orbiter
Allen Telescope Array, Seth Shostak
Dyson sphere, Danielle Futselaar
Giant Magellan Telescope, GMTO Corporation
Pyramids at Giza, Seth Shostak

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