Thomas Albert Sebeok (, ; November 9, 1920December 21, 2001) was a Hungarian-born American polymath, semiotician, and linguist. As one of the founders of the biosemiotics field, he studied non-human and cross-species signaling and communication. He is also known for his work in the development of long-time nuclear waste warning messages, in which he worked with the Human Interference Task Force (established 1981) to create methods for keeping the inhabitants of Earth away from buried nuclear waste that will still be hazardous 10,000 or more years in the future.
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