He earned his PhD in Social Psychology from the University of California, Berkeley. His research explores the underlying psychological processes that lead individuals to join together to form cohesive groups and societies, with a particular focus on morality and political attitudes. Matthew’s research has been published in journals such as Psychological Science, Journal of Personality and Social Psychology, Emotion, and Political Psychology. His work has been covered by various media outlets including The Washington Post, New York Times, Reuters, Fox News, Scientific American, Al Jazeera, CBS News, USA Today, WebMD, National Geographic, Huffington Post, and San Francisco Chronicle.