Cohen worked at WLVI in Boston as associate producer of environmental program "Green Watch". She also worked as a reporter for States News Service in Washington, DC and for The "Times Union" in Albany, New York. Cohen joined CNN in 1991. She focuses on health-related issues and has reported from a medical angle on major news stories including the Gulf oil spill, the 2010 Haiti earthquake and Hurricane Katrina. She is currently senior medical correspondent for CNN's Health, Medical and Wellness unit.