The authoritative guide to ensuring science and technology make life on Earth better, not worse.

Watch the 2025 Doomsday Clock announcement on January 28


Henry D. Jacoby

Henry D. Jacoby is a professor of management in the MIT Sloan School of Management and former codirector of the MIT Joint Program on the Science and Policy of Global Change. He serves on a National Academies committee to advise the US Global Change Research Program, and is a convening lead author for the mitigation chapter of the US National Climate Assessment.