How Leaders Shape Culture: What the Evidence Says

The strongest recent evidence comes from Aydogdu et al. (2024), a meta-analysis of 22 studies examining the relationship between transformational leadership and organisational culture. The overall effect was substantial (r = 0.44, p < .001), confirming that leaders who inspire, challenge, and develop their people are associated with stronger, more cohesive cultures. What makes this finding particularly compelling is the heterogeneity statistic: I² = 4%, meaning the effect is remarkably consistent across the studies examined. This is unusual in organisational research, where context-dependent variation is the norm.

However, framing this as "leaders create culture" would be an oversimplification. Hartnell et al. (2019), in a much larger synthesis (148 samples, over 556,000 informants across 26,196 organisations), found that while culture and leadership are substantially correlated, they function as distinct influences on organisational effectiveness. Culture explains unique variance in performance outcomes even after controlling for leadership. Put differently, culture is doing real work that leadership alone does not account for. Moreover, when culture and leadership are modelled together, the combined effect on performance is significantly stronger than either predictor in isolation.

Earlier path-model work by Hartnell et al. (2013) shed further light on the mechanism: culture partially mediates the relationship between leadership and unit performance. This means leadership does shape culture, but culture then acts as an active transmission mechanism — amplifying, translating, or sometimes buffering leadership's impact on results. Culture is not a passive downstream consequence; it is a dynamic force in its own right.

There is also evidence that leadership influence on culture is not limited to behaviour. O'Reilly et al. (2014) found that CEO personality traits — particularly conscientiousness, agreeableness, and openness — predict specific culture dimensions. Though Kyser (2017) noted that in smaller firms, collective employee personality can override the founder's cultural imprint, suggesting that cultural influence is more distributed than hierarchical models imply.

The practical implication is clear: treat leadership and culture as two distinct but complementary investment areas.

Organisations that pour resources solely into leadership development may be disappointed by the cultural returns. The evidence suggests that even excellent leadership explains only part of what drives a healthy, effective culture. The rest comes from systems, norms, rituals, and shared expectations that exist beyond any single leader's influence.

Conversely, culture-building programmes that ignore leadership are equally incomplete. Leaders remain one of the strongest single influences on culture — the r = 0.44 effect is not trivial. They set tone, model behaviour, and make the resourcing decisions that enable or undermine cultural aspirations.

The sweet spot, supported by the Hartnell (2019) findings, is investing in both simultaneously. Develop leaders who understand their cultural impact, and build cultural infrastructure — values, feedback loops, norms, recognition systems — that does not depend on any individual leader to sustain it.

One important caveat: the training literature (Arthur et al., 2003) shows medium-to-large effects for training generally (d ≈ 0.60), but only 6% of studies reported conducting a needs assessment beforehand. Organisations that invest in leadership development without first diagnosing their specific cultural gaps are likely leaving significant value on the table.