Mangan has been a journalist for more than 20 years, most recently as a general assignment/rewrite reporter at the New York Post. In his more than dozen years at The Post, Mangan routinely covered major stories, including the 9/11 terror attacks, the Bernard Madoff Ponzi scheme, the 2008 financial meltdown and a slew of juicy Gotham scandals du jour, among them the personal tribulations of Yankee slugger Alex Rodriguez. 

Prior to that, Mangan began his career in his native Connecticut, writing obituaries for The Hour of Norwalk, before moving on to cover business, government and the court systems at The Hour, the Fairfield County Business Journal and The Advocate of Stamford.