His second book, The Spirit Level Delusion: Fact-checking the Left's New Theory of Everything (2010), is a response to and critique of The Spirit Level: Why More Equal Societies Almost Always Do Better.
Peter Robert Saunders, Professor Emeritus of Sociology at Sussex University, published a report for the think tank Policy Exchange questioning the statistics in The Spirit Level.
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She co-authored (with Richard G. Wilkinson) The Spirit Level: Why More Equal Societies Almost Always Do Better and is Director of The Equality Trust.
Recently, various studies have been conducted with results that endorse the tremendous importance of having a more equitable society (see, for example, The Spirit Level: Why More Equal Societies Almost Always Do Better by Richard G. Wilkinson and Kate Pickett).
He is best known for his book with Kate Pickett The Spirit Level, first published in 2009, which claims that societies with more equal distribution of incomes have better health, fewer social problems such as violence, drug abuse, teenage births, mental illness, obesity, and others, and are more cohesive than ones in which the gap between the rich and poor is greater.