John Arthur Heilemann (born January 23, 1966) is an American journalist for New York magazine, where he mainly covers US politics. He is the co-author (with Mark Halperin) of Double Down and Game Change, books about Presidential campaigns. He previously was a staff writer for The New Yorker, Wired, and The Economist. He is the author of a previous book, Pride Before the Fall, about the Microsoft antitrust case. He was the host of a four-part documentary series for Discovery called Download: the True Story of the Internet, about the rise of the World Wide Web, which first aired in 2008. Heilemann is also an MSNBC political analyst.