Dorion Sagan is an American science writer, essayist, and ecological philosopher. He has authored or co-authored over 25 books on culture, evolution, and the history and philosophy of science, with his works translated into 15 languages.

Sagan is the son of renowned astronomer Carl Sagan and distinguished biologist Lynn Margulis. His collaborative works often explore the intersections of science and philosophy, notably focusing on symbiosis as a driving force in evolution and the concept of the human body as a “multispecies organism.”

Among his notable publications are Into the Cool: Energy Flow, Thermodynamics, and Life (co-authored with Eric D. Schneider), which examines the relationship between non-equilibrium thermodynamics and life, and Lynn Margulis: The Life and Legacy of a Scientific Rebel, a biography of his mother. His book Death and Sex won first place at the 2010 New York Book Show in the general trade nonfiction category.

Sagan's contributions extend beyond writing; he has been a Humana Scholar at Centre College in Danville, Kentucky, and is a Fellow of the Lindisfarne Association. His interdisciplinary approach has made significant impacts in both scientific and humanities fields, challenging conventional perspectives on life and evolution.

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