--- title: Jeffrey Sonnenfeld | TIME description: Sonnenfeld is the Lester Crown Professor of Leadership Practice at the Yale School of Management and the co-author of the New York Times best-selling book Trump’s Ten Commandments (Simon & Schuster/Worth). canonical: https://time.com/author/jeffrey-sonnenfeld/ og:title: TIME | Current & Breaking News | National & World Updates og:description: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. og:url: https://time.com/author/jeffrey-sonnenfeld/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production og:image:width: 300 og:image:height: 300 og:image:alt: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. og:type: profile twitter:card: summary twitter:title: TIME | Current & Breaking News | National & World Updates twitter:description: Breaking news and analysis from time.com. Politics, world news, photos, video, tech reviews, health, science, and entertainment news. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltde093bcdab65f2d0/6988d9b9bc6cfc69913e2a3c/time-logo.jpg?branch=production --- # Jeffrey Sonnenfeld ## Jeffrey Sonnenfeld _Sonnenfeld is the Lester Crown Professor of Leadership Practice at the Yale School of Management and the co-author of the New York Times best-selling book_ [_Trump’s Ten Commandments_](https://www.simonandschuster.com/books/Trumps-Ten-Commandments/Jeffrey-Sonnenfeld/9781637635568) _(Simon & Schuster/Worth)._ ## Jeffrey Sonnenfeld *  Jul 16, 2026 ### [Why It Is Time for the West to Crush Putin’s War Economy](https://time.com/article/2026/07/15/west-ukraine-russia-putin-sanctions-economy-/) Corporations walked away from Russia in historic numbers. Governments loosened sanctions just as the... [IDEAS](/section/ideas/) *  Jul 8, 2026 ### [Which Side Are You On? Swift, Trump, and America's 250th](https://time.com/article/2026/07/07/july-4th-taylor-swift-america250-donald-trump/) Swift stands for success through competence, talent, and the joyous embrace of all that American soc... [IDEAS](/section/ideas/) *  Jun 28, 2026 ### [How Mission Hijacking Undermines the Fight for American Democracy](https://time.com/article/2026/06/28/overcrowding-hobbling-fight-to-strengthen-american-democracy/) The movement to strengthen democracy in America is suffering as a surfeit of advocacy groups is crow... [IDEAS](/section/ideas/) *  Jun 22, 2026 ### [Trump, Iran and the Denial of Defeat](https://time.com/article/2026/06/22/trump-iran-war-denial-of-defeat/) President Donald Trump always declares victory and relentlessly repeats that narrative, regardless o... [IDEAS](/section/ideas/) *  Jun 9, 2026 ### [How Trump Keeps Exploiting America’s Legal Loopholes](https://time.com/article/2026/06/09/how-trump-keeps-exploiting-america-s-legal-loopholes/) President Donald Trump continues to outfox constitutional cognoscenti by finding conniving cracks in... [IDEAS](/section/ideas/) *  May 23, 2026 ### [How Ukraine Found the Cards To Win, Without Help From the U.S.](https://time.com/article/2026/05/23/how-ukraine-found-the-cards-to-win-without-help-from-the-u-s-/) Kyiv’s revolutionary drone industry has turned the tide against Russia’s invasion. [WORLD](/section/world/) *  May 20, 2026 ### [The Truth About Donald Trump’s Sanity](https://time.com/article/2026/05/20/the-truth-about-donald-trump-s-sanity/) “Trump’s penchant for exaggeration, self-promotion, and misrepresentation is hardly new,” argues Jef... [IDEAS](/section/ideas/) *  May 11, 2026 ### [Colonies in Collision: What Some Allied Leaders Get Wrong About Trump](https://time.com/article/2026/05/11/what-allied-leaders-get-wrong-about-trump/) President Donald Trump probes the limits of what is permissible, pressing forward to test resistance... [IDEAS](/section/ideas/) *  Apr 8, 2026 ### [Why We Predicted Trump’s Iran Ceasefire](https://time.com/article/2026/04/08/why-we-predicted-trump-s-iran-ceasefire/) "Trump’s Iran ceasefire was anything but surprising and mirrors his career-long instincts across pol... [IDEAS](/section/ideas/) *  Mar 25, 2026 ### [The Method to Trump’s Madness](https://time.com/article/2026/03/25/the-method-to-trump-s-madness/) In their new book, 'Trump’s Ten Commandments,' Jeffrey Sonnenfeld and Steven Tian break down the Pre... [IDEAS](/section/ideas/) *  Feb 10, 2026 ### [Trump’s Denial of Defeat](https://time.com/7377361/trump-denial-of-defeat-harvard/) One of the most consistent through-lines of President Donald Trump's career has been to reject those... [IDEAS](/section/ideas/) *  Feb 7, 2026 ### [Trump’s Obama Video Was a Diversion, Not an Accident Trump’s Obama Video Was a Diversion, Not an Accident](https://time.com/7372895/trump-obama-video-diversion/) "Rather than an inadvertent mistake, this episode epitomizes Trump’s approach to intentionally creat... [IDEAS](/section/ideas/) *  Jan 29, 2026 ### [Trump Shouts Loudly and Fumbles a Big Stick](https://time.com/7361971/donald-trump-shouts-loudly-fumbles-big-stick/) From Greenland to Minnesota, some of Trump's tried-and-true leadership tools are backfiring on him. [IDEAS](/section/ideas/) *  Jan 20, 2026 ### [How Trump Outfoxed Himself](https://time.com/7353732/trump-outfoxed-himself/) "Trump’s challenge is not his intelligence or his sanity, it is his values and his over-reliance upo... [IDEAS](/section/ideas/) *  Jan 13, 2026 ### [Democrats' Chance to Defend Capitalism From Trump](https://time.com/7345691/democrats-defend-capitalism-from-trump/) As Trump embraces state capitalism, Democrats should embrace being the party of practical economic s... 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