[5][6] In response to ongoing controversies over his stated views, such as that Sub-Saharan Black African countries suffer from chronic poverty and disease because their people have lower IQs, and that black women are objectively less attractive than women of other races, he was dismissed from writing for Psychology Today, and his employer, the London School of Economics, prohibited him from publishing in non-peer-reviewed outlets for 12 months.
[12] In 2003, in an article in the Journal of Research in Personality, he claimed to show that scientists generally made their biggest discoveries before their mid-30s, and compared this productivity curve to that of criminals.
[17] Gelman argues that Kanazawa's analysis does not convincingly show causality, because of possible endogeneity as well as problematic interpretations of statistical significance in multiple comparisons.
[12] In September 2011, Kanazawa apologised to LSE director Judith Rees, saying he "deeply regrets" the "unintended consequences" of the blog and accepting that "some of [his] arguments may have been flawed and not supported by the available evidence".
[23] Kanazawa has used the term Savanna principle to denote his hypothesis that societal difficulties exist because "the human brain" evolved in Africa hundreds of thousands of years ago, a drastically different environment from today's urban, industrial society.
[25] In a criticism of the paper, George Ellison (2007) argued that the conclusion was based on "flawed assumptions, questionable data, inappropriate analysis and biased interpretations".
[26] According to neuroscientist Simon LeVay, an early review in academic literature suggested that gays and lesbians were more intelligent than their peers, although this may have suffered from volunteer bias.
On 6 March 2008, in the article subtitled "All you need is hate", he suggested a "little thought experiment", asking his readers to "(i)magine that, on September 11, 2001, when the Twin Towers came down, the President of the United States was not George W. Bush, but Ann Coulter.
On September 12, President Coulter would have ordered the US military forces to drop 35 nuclear bombs throughout the Middle East, killing all of our actual and potential enemy combatants, and their wives and children.
", at the time Columbia University epidemiologist and HuffPost contributor, Abdul El-Sayed, quoted Kanazawa's articles, along with some other authors', when he discussed the phenomenon of "a growing number of academics using (their) intellectual identity to promote intolerance and xenophobia against Islam and Muslims".
El-Sayed expressed concern that, as he writes, "the fundamental messages portrayed in the public musings of academics are no different from the crude ramblings of a Glenn Beck or a Rush Limbaugh, they are many times more damaging".