From the years before World War I until the late 1960s, the journalist and political theorist Walter Lippmann was one of the most influential writers in the United States of America.

His words and ideas had a powerful impact on American liberalism and his writings on the media are still taught today.

Lippmann is now the subject of Tom Arnold-Forster’s Walter Lippmann: An Intellectual Biography (Princeton UP, 2025). Arnold-Forster explores Lippmann in his evolving historical context, from the Progressive Era to the Cold War. He argues that Lippmann was a much more complicated thinker than is usually recognized who went from being a liberal socialist to a conservative liberal.

Arnold-Forster is a historian at the Rothermere American Institute, Oxford University, where he works on the political and intellectual history of the modern United States and the history of political thought. His articles have appeared in scholarly journals and general interest publications. His article on Lippmann and public opinion, published in American Journalism, won the 2024 Dorothy Ross Prize for best article from the Society for United States Intellectual History.