Mark Hertsgaard (born 1956) is an American journalist who is environmental correspondent for The Nation. His best-known work is On Bended Knee: The Press and the Reagan Presidency (1988), which described the way the Reagan White House "deployed raw power and conventional wisdom to intimidate Washington's television newsrooms".
Hertsgaard received a B.A. from The Johns Hopkins University in 1977 and was one of the founders of Baltimore City Paper. In the 1990s, Hertsgaard's attention turned to the ecology of the Earth. He embarked upon a seven-year global tour to investigate the issue of environmental degradation. The journey spanned four continents, 19 countries and hundreds of interviews. This resulted in the book Earth Odyssey: Around the World in Search of Our Environmental Future (1999, ), which was reviewed favorably in the New York Times Book Review and Time magazine.
Hertsgaard also wrote climate change adaptation, published by Houghton Mifflin Harcourt, titled Hot: Living Through the Next Fifty Years on Earth (2011, ). From 2011 to 2013, he was Schmidt Family Foundation Fellow at New America Foundation researching the linked challenges of climate change, food security, poverty and ecological agriculture.
During a Mother's Day second line parade in New Orleans in 2013, Hertsgaard was shot and wounded along with 19 other people at the corner of Frenchmen Street and North Villere in the 7th Ward.