Marty Baron took charge of The Washington Post newsroom in 2013, after nearly a dozen years leading The Boston Globe. Just seven months into his new job, Baron received explosive news: Jeff Bezos, the founder of Amazon, would buy the Post, marking a sudden end to control by the venerated family that had presided over the paper for 80 years. Just over two years later, Donald Trump won the presidency. Now, the capital's newspaper, owned by one of the world's richest men, was tasked with reporting on a president who had campaigned against the press as the "lowest form of humanity." Pressures on Baron and his colleagues were immense and unrelenting, having to meet the demands of their new owner while contending with a president who waged a war of unprecedented vitriol and vengeance against the media. In the face of Trump's unceasing attacks, Baron steadfastly managed the Post's newsroom. Their groundbreaking and award-winning coverage included stories about Trump's purported charitable giving, misconduct by the Secret Service, and Roy Moore's troubling sexual history. At the same time, Baron managed a restive staff during a period of rapidly changing societal dynamics around gender and race. In Collision of Power, Baron recounts this with the tenacity of a reporter and the sure hand of an experienced editor. The result is elegant and revelatory-an urgent exploration of the nature of power in the 21st century.