What is greatness and how do people get there? Is greatness born or made? Is greatness the result of talent or practice? Few other questions have caused such intense debate, controversy, and diversity of opinions. The heights of human accomplishment have always fascinated us, and for good reason. The striving for greatness is a fundamental human drive, and without it we would be bereft of some of our most valuable cultural products. How we conceptualize greatness and its developmental trajectory has important implications for education, business, and society— which makes it all the more important that we make an effort to understand all the many complex, nuanced factors contributing to its emergence.

Greatness eludes precise definition, and historically it has been approached in different ways. In ancient times, greatness had spiritual connotations, and geniuses were viewed as divine. Kant thought talent was an integral ingredient of the emergence of greatness, as geniuses use their natural talents to produce something original and exemplary (Kant, 1790/1952). According to Kant, since genius was inborn, it cannot be taught; it can only be imitated by inspired non-geniuses. The English dramatist John Dryden echoed Kant’s sentiment, declaring, “genius must be born, and never can be taught” (Dryden, 1693/1885, p. 60).

Since the beginning of this debate, both extremes have been represented. Sir Joshua Reynolds, an influential 18th century British painter, warned his students at the Royal Academy that

You must have no dependence on your genius. If you have great talents, industry will improve them; if you have but moderate abilities, industry will supply their deficiency. Nothing is denied to well directed labour; nothing is to be obtained without it. Not to enter into metaphysical discussions on the nature or essence of genius, I will venture to assert, that assiduity unabated by difficulty, and a dispo- sition eagerly directed to the object of its pursuit, will produce effects similar to those which some call the result of natural powers. (Reynolds, 1966, p. 37)

While it seemed everyone had an opinion, the topic started receiving scientific treatment with the publication of Francis Galton’s Hereditary Genius in 1869. Based on his analysis of eminent lineages, Galton, who was Charles Darwin’s cousin and was greatly influenced by Darwin’s ideas, argued that genius is primarily born. While Galton acknowledged the importance of passion, zeal, and persistence, he argued that regardless of environment, those with exemplary natural abilities inevitably rise to the top (Galton, 1874). This idea didn’t go unchallenged. Alphonse de Candolle (1873) showed evidence for the importance of environmental factors, finding that eminent scientists from Western civilization tended to do their best work under particular political, economic, social, cultural, and religious circumstances. However, while de Candolle’s results showed the importance of environmental conditions on the average population, his data did little to explain individual differences within a population.

The early behaviorists, including B. F. Skinner and John Watson, emphasized conditioning. No doubt biased by his particular theoretical position on learning and behavior, Watson made the following bold claim:

Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in, and I’ll guarantee to take any one at random and train him to become any type of specialist I might select—a doctor, lawyer, artist, merchant-chief, and yes, even a beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations and race of his ancestors. I am going beyond my facts and I admit it, but so have the advocates of the contrary and they have been doing it for many thousands of years. (Watson, 1930, p. 82)

Regardless of the veracity of this bold assertion, at least Watson was honest that more data were needed on this topic! The advent of cognitive psychology brought an emphasis on expertise acquisition as the main factor underlying differences in elite performance. Nobel Prize laureate Herbert Simon and William Chase suggested that a decade of intense work and apprenticeship is required to become an expert in chess (Chase & Simon, 1973). This has become known as “the 10-year rule.” K. Anders Ericsson and his colleagues have extended this research in a number of domains, including medicine, professional writing, music, art, math, and sports (Ericsson, Charness, Feltovich, & Hoffman, 2006). Researchers operating under the expertise performance framework argue that greatness is largely the result of a large amount of domain-specific knowledge, acquired through many thousands of hours of deliberate practice where one is constantly striving to learn from feedback and push beyond his or her limits (Colvin, 2010; Coyle, 2009; Ericsson, Krampe, & Tesch-Römer, 1993; Syed, 2010).

While deliberate practice is certainly important, it’s unlikely to be the whole story. Even though the most cited and well-known philosophers and psychologists of all time were those who took extreme views on key debates of their time, including the nature–nurture debate, more moderate, integrative stances are more likely to be correct (Simonton, 1976, 2000a). In only the past quarter century, scientists across numerous fields—such as behavioral genetics, neuroscience, developmental psychology, personality psychology, and positive psychology— have amassed a large body of empirical findings that suggest the origins of greatness are far more complex than any single approach will capture (Marcus, 2012; Shenk, 2011; Kaufman, 2013). Things are often not what they seem.

Take the practice side of the debate. Many studies looking at experts suffer from a restricted range: Those without the requisite abilities have already been weeded out of the competition, so those skills will no longer be predictive of performance. What happens when you look at a random selection of the population? While deliberate practice may be an important contributor to expertise, is it also sufficient to carry just anyone all the way to greatness?

Recent research suggests it’s not. David Z. Hambrick and colleagues found that deliberate practice explained about 30% of the variation in performance in the two most widely studied domains in expertise research– chess and music (Hambrick et al., 2013). On the one hand, this is a very impressive amount of variation explained. Clearly, deliberate practice matters a lot, perhaps trumping any other single personal characteristic. But at the same time, most of the variation was left unexplained by other personal and environmental factors.

But if we dig even deeper, we can see more complications. What is the genetic contribution to the willingness to practice in the first place? While passion and persistence are certainly important for greatness, where do these characteristics come from (Cordova & Lepper, 1996; Duckworth, Peterson, Matthews, Michael, & Kelly, 2007; Ryan & Deci, 2000; Kaufman, 2009, Vallerand et al., 2003)? Behavioral geneticists have discovered that virtually all psychological dispositions have a heritable basis (Turkheimer, 2000). Therefore, motivation and the ability to persevere and persist in the face of obstacles are likely influenced (although not completely determined) by genetic factors, which are always interacting with environmental factors.

What has become clear is that the 10-year rule is not actually a rule, but an average with significant variation around the mean. In fact, in some domains within the arts and sciences, those with the greatest lifetime productivity and highest levels of achieved eminence required the least amount of time to acquire the requisite expertise (Simonton, 1991a, 1991b, 1992, 1997, 1999). However, there are some fields, such as creative writing, where there doesn’t appear to be an early advantage to achieving greatness (Kaufman & Gentile, 2002), and if anything there may require on average an additional 10 years after professional-level expertise is acquired to achieve greatness (Kaufman & Kaufman, 2007). An even further complication is that too much expertise can be detrimental to greatness. Research shows that experts are at risk of becoming overly specialized and inflexible in their thinking (Frensch & Sternberg, 1992), although the disadvantages of over-training can be overcome by acquiring expertise across numerous, diverse domains (Simonton, 2000a).

Now consider the talent side of the debate. Many popular writers on this topic treat talent as if it means that some people are born with a skill, fully formed at birth. While psychologists acknowledge that many different traits such as IQ, creativity, talents, interests, and personality dimensions influence greatness, no sensible scientist claims that any of these traits are completely deterministic. Scientists will be the first to admit that no trait comes fully formed at birth, and there is plenty of variation unaccounted for to leave room for late bloomers and prodigies who burn out fast (Kaufman, 2008; Protzko & Kaufman, 2010). Also, no sensible scientist would argue that just because a trait has a genetic contribution, it is immutable. Something can have a very large heritability coefficient and still be very amenable to change. As it turns out, the way genes influence greatness is much more nuanced and fascinating.

Also, many seemingly environmental effects, such as parenting style, have turned out to have large genetic components. As one example, the direct influence of parenting has been shown to be overrated, as the apparent association between parental phenotype and offspring phenotype is often the result of shared parent–child geno- type rather than a direct effect of parenting causing their children’s behaviors (Harris, 1999; Pinker, 2003). Certainly parenting matters. Water still has an essential influence on fish, even if it doesn’t explain any of the differences between fish. It turns out that parenting is important for child development in ways different than originally assumed. Genes influence parenting because, like any other behavior, parenting behaviors are influenced by genes. Parents play a crucial role in supporting the expression of genes, as do peers and teachers. The importance of environmental support is most striking in the context of disadvantaged homes, where genes account for substantially less variation in cognitive ability compared to socioeconomically advantaged homes (Tucker-Drob, Rhemtulia, Harden, Turkheimer, & Fask, 2010).