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PMR Books

the halo effect

… and the Eight Other Business Delusions that Deceive Managers

An irreverent look at common mistakes that pervade the business world.

My best-known book, written to help managers improve their skills of critical thinking.

The Halo Effect

in a nutshell:

A Must-Read Guide for Managers

The Halo Effect unmasks the delusions found in the corporate world and provides a sharp understanding of what drives business success and failure.

Too many of today’s most prominent management gurus make steel-clad guarantees based on claims of irrefutable research, promising to reveal the secrets of why one company fails and another succeeds, and how you can become the latter. Combining equal measures of solemn-faced hype and a wide range of popular business delusions, statistical and otherwise, these self-styled experts cloud our ability to think critically about the nature of success.

Central among these delusions is the Halo Effect – the tendency to focus on the high financial performance of a successful company and then spread its golden glow to all its attributes–clear strategy, strong values, brilliant leadership, and outstanding execution. But should the same company’s sales head south, the very same attributes are universally derided–suddenly the strategy was wrong, the culture was complacent, and the leader became arrogant.

The Halo Effect not only identifies these delusions that keep us from understanding business performance, but also suggests a more accurate way to think about leading a company. This approach – focusing on strategic choice and execution, while recognizing the inherent riskiness of both – clarifies the priorities that managers face.

Brilliant and unconventional, irreverent and witty, The Halo Effect is essential reading for anyone wanting to separate fact from fiction in the world of business.

“One of the Best Business Books”

Financial Times

“A trenchant view of business and business advice.”

the wall street journal

“A refreshing corrective.”

The Guardian

behind the book

I wrote The Halo Effect after my first seven years at IMD.  By then, I had worked with hundreds of managers, from a range of companies and industries, and found that most were smart and hard-working, but had difficulty distinguishing between good research and bad research. Many were willing to believe what they were told by people in positions of authority: consultants, best-selling authors, self-appointed “thought leaders,” and even business school professors! I wrote it to help them think for themselves, to separate the nuggets from the nonsense. 

First published in 2007, The Halo Effect received much favorable attention and many positive reviews.  It won several awards and has been translated into 12 languages.

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praise for

the halo effect

"Business books all too rarely combine real-world savvy with scientific rigor. Rosenzweig's book is an outstanding exception -- it's a superb work and long overdue."
Philip E. TetlockLorraine Tyson Mitchell II Chair in Leadership and Communication, Haas School of Business, University of California, Berkeley
“Rosenzweig doesn’t just poke fun at the mass of bad writing and bad science in the management world. He explains why it is so bad - and how you can learn from it despite the efforts of the authors.”
John KayFinancial Times
“I was taken by this book. It destroys myths concerning the attribution of success in the management literature using potent empirical arguments. It should stand as one of the most important management books of all time and an antidote to those best-selling books by gurus presenting false patterns and naive arguments.”
Nassim Nicholas Talebauthor of The Black Swan
“He writes with a relaxed sense of mastery, uses simple but compelling examples, is rigorous without being pedantic, and bends over backwards to be fair to these so-called experts he demolishes.”
The Conference Board
“In The Halo Effect, Phil Rosenzweig has done us all a great service by speaking the unspeakable. His iconoclastic analysis is a very welcome antidote to the kind of superficial formulaic and dumbed-down matter that seems to be the current stock in trade of many popular business books. It's the right book at the right time.”
John R. KimberlyThe Wharton School, University of Pennsylvania
“This is a fascinating, tightly argued book that challenges much of what we know about business, prodding us to view the research findings with more skepticism. It is an appeal to the mind rather than a practical handbook for managers, but it does help us evaluate the foundation for the new and old ideas we hear.”
Toronto Globe and Mail
“A dismantling of much business writing, which finds that the advice peddled in countless best-selling books may be much less useful than it appears... A thorough occasionally devastating de-boning of a clutch of business books and popular business reporting.”
The guardian
“Rosenzweig offers a telling indictment of the superficiality of much management literature and a critique of the many studies that claim to illuminate the source of high performance through the experience of successful companies.”
Management Today
“A feisty and entertaining book [that shows how] problems of research methodology and corrupt data bedevil much management literature, turning it into reassuring parables rather than reliable guidance based on empirical evidence... has the temerity to name names... Gives a seeing-to to Jim Collins and Jerry Porras’s Built to Last and Collins’s Good to Great, perhaps the most influential management volumes of recent years.”
Simon CulkinThe Observer
“[Rosenzweig] deserves acclaim for this brave provocative piece of work... He has thrown down a serious challenge to his business school peers and the business media as well.”
The Financial Times
“A masterly exposé of many myths and sloppy thinking in management. If you want to avoid the next dumb fad, and, in Kipling's famous line ‘keep your head when all about you are losing theirs,’ this is an essential primer.”
Professor Andrew CampbellAshridge Business School

A distillation of business delusions​

Phil’s article won the Accenture Award for Best Article of 2007.

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PMR Books

The Halo Effect in The McKinsey Quarterly

 Article by invitation: Phil writes on The Halo Effect & other managerial delusions.
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Podcast Interview: Investing By the Books

Although originally published in 2007, The Halo Effect continues to attract attention, and in 2025 I was interviewed by the podcast, Investing By the Books.

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