From 1420 MHz Beacons to Breakthrough Listen: A History of SETI and Technosignatures

To the point

SETI began in the 1960s with radio and optical searches and foundational ideas from Cocconi, Morrison, Drake, Townes, Bracewell, Dyson, and Kardashev, and has grown into a modern, open, international effort using many telescopes to search for a broad range of technosignatures and megastructures, guided by Jill Tarter and Andrew Siemion and committed to careful verification despite funding challenges.