Tim Groseclose

American political scientist — author of Left Turn: How Liberal Media Bias Distorts the American Mind — whose quantitative research at UCLA produced the most rigorous academic measurement of media political bias.

Creates the quantitative media bias measurement methodology — Groseclose and Milyo's political science methodology (comparing media outlet citations of think tanks and political figures to the citation patterns of members of Congress with known political positions) is the most methodologically rigorous academic attempt to measure media bias.