# David Brock David Brock is a political operative and media entrepreneur who made a dramatic ideological journey from conservative attack journalist to liberal media watchdog. In the 1990s he was a key figure in the [[Republican Party]] opposition-research ecosystem, writing hit pieces for right-wing outlets before publicly breaking with the movement. In 2004 he founded Media Matters for America, a nonprofit dedicated to monitoring and countering [[Disinformation]] in the conservative [[Media Ecosystem]]. He has also been involved in pro-[[Democratic Party]] super PAC activity. His career arc—from writing for conservative magazines to building infrastructure to combat [[Fox News]] narratives—makes him an unusual case study in partisan realignment among political operatives.