Marcelo Gleiser is a professor of physics and astronomy at Dartmouth College. He specializes in cosmology, nonlinear physics, and astrobiology.

His main research interests fall into two general areas. The first is the interface between cosmology (which studies the universe as a whole) and particle physics (which studies the smallest material constituents of the universe). We now know that if we are to reconstruct the history of the universe from its origin to today, we must mix the physics of the very large with the physics of the very small. His second general area of research is the origin of life on Earth and the possibility of life elsewhere in the universe. In other words, how did nonliving chemicals become living entities on the early Earth?

Marcelo is a fellow of the American Physical Society and a recipient of the Presidential Faculty Fellows Award from the White House and the National Science Foundation. He is also very active in the public understanding of science, with five published books in English translated to 12 languages and hundreds of essays in newspapers, magazines, and online. He was the co-founder and, for eight years, regular contributor, of the NPR blog 13.7: Cosmos and Culture. Currently, he writes weekly essays for the online magazine Orbiter in his blog 13.8.