An evidence-based guide for leaders who want to understand their real impact on culture
Let's be honest. When most organisations talk about "culture change," they reach for the usual tools: a new set of values on the wall, a leadership workshop, maybe a staff engagement survey. And while none of those things are bad ideas, they tend to miss the most powerful driver of culture in any organisation. You.
Not you as a title or a role. You as an emotional being who walks into a room, sits in a meeting, sends a message on a bad day, or lights up when something goes right. That version of you is shaping your team's culture far more than any policy document ever will.
The science on this is clear, and the implications for leaders are both sobering and exciting. Emotions at work are contagious. Leadership emotion shapes organisational culture. And leaders who manage their own emotional world create stability for the people around them.
Let's unpack what that actually means in practice.
Emotional Contagion Is Real, and It Starts at the Top
You've probably experienced emotional contagion without ever calling it that. Think about the last time you walked into a room where someone was visibly tense. Within minutes, you felt it too, right? That's not coincidence. It's biology.
Psychologists Elaine Hatfield, John Cacioppo, and Richard Rapson, who pioneered research in this area, describe emotional contagion as the tendency to automatically mimic and synchronise facial expressions, vocalisations, postures, and movements with those of another person, and as a result, to converge emotionally (Hatfield, Cacioppo & Rapson, 1993). In short, we are wired to catch feelings from one another.
In the workplace, this process is amplified by hierarchy. Research by Sy, Cote, and Saavedra (2005) found that a leader's mood had a significant effect on their team's mood, coordination, and effort. Leaders who were in a positive emotional state led groups that demonstrated better cooperation and task performance. The reverse was equally true.
The mechanism behind this, at least in part, is our mirror neuron system. Discovered in the early 1990s by neuroscientist Giacomo Rizzolatti and his team at the University of Parma, mirror neurons fire both when we perform an action and when we observe someone else performing it (Rizzolatti & Craighero, 2004). They form a biological basis for empathy, emotional attunement, and yes, the unconscious mirroring of the people we spend the most time with.
As a leader, you are the most watched person in the room. Your team is constantly, and largely unconsciously, reading your emotional signals. Before your strategy spreads, before your motivation campaign lands, your emotions have already set the tone.
What Actually Spreads: The Four Emotional Patterns
Daniel Goleman, one of the world's foremost authorities on emotional intelligence, puts it plainly in his work on "primal leadership": the leader's emotional state is the most powerful driver of group dynamics (Goleman, Boyatzis & McKee, 2002). Here's what that looks like in practice.
Anxiety spreads. When you're operating from a place of chronic stress or unresolved anxiety, your team picks it up. They become hypervigilant. They start playing it safe, covering their backs, and spending energy managing fear instead of driving results. A 2012 study by Barsade and Gibson found that negative emotional contagion was particularly strong in teams under pressure, precisely the moment when leaders most need to be able to self-regulate.
Calm spreads. This is one of the most underrated leadership capabilities there is. A calm leader doesn't mean a passive or disengaged one. It means someone who has enough emotional steadiness to think clearly and help others do the same. Research in psychological safety by Amy Edmondson at Harvard Business School shows that teams perform better when they feel it's safe to take interpersonal risks, and that sense of safety is heavily influenced by the emotional tone the leader sets (Edmondson, 1999).
Doubt spreads. Leaders often underestimate how much their team is reading between the lines. If you're hesitant about a decision, uncertain about the direction, or visibly disengaged from the organisation's vision, your team will feel it. Even if you say all the right things. Authenticity matters. Credibility is emotional, not just logical.
Confidence spreads. Grounded, genuine confidence is contagious in the best possible way. When a leader truly believes in the path forward and in the ability of their team to get there, that belief transmits. It creates what psychologist Albert Bandura called "collective efficacy": a shared belief in the group's capacity to achieve its goals, which is one of the strongest predictors of team performance (Bandura, 1997).
What This Looks Like Day-to-Day
Theory is useful. But let's get practical about how this plays out in real workplaces.
A defensive leader creates a silent team. When people sense that honest feedback or a challenging question will be met with defensiveness, they stop offering it. They smile and nod. Ideas stay unshared, problems go unaddressed, and the leader ends up operating in a bubble. This is precisely how companies and teams get blindsided by problems that everyone could see coming except the person in charge.
A stressed leader creates a reactive team. Urgency becomes the permanent operating mode. There's no space to think strategically because everything is a fire. People start making reactive decisions, cutting corners, and burning out. The pace feels productive, but the output is scattered. Stress at the top cascades down through the system.
An optimistic leader creates a solution-focused team. This doesn't mean toxic positivity or ignoring real challenges. It means a leader who, when problems arise, models the belief that they can be worked through. That orientation shifts the team's default question from "why is this happening to us?" to "what can we do about this?" That shift alone changes everything.
A calm leader creates a regulated team. When leaders can hold their centre under pressure, they model something invaluable: that it's possible to stay functional in difficulty. Teams that experience this regularly become more resilient, more adaptive, and more willing to take the kinds of risks that lead to growth.
The Work Nobody Tells You About
Here's the bit that catches most leaders off guard: the most impactful leadership development work is internal.
Emotional intelligence, as defined by Goleman, involves four key domains: self-awareness, self-management, social awareness, and relationship management (Goleman, 1995). Of these, self-awareness and self-management are the foundational ones. You can't regulate what you haven't noticed. And you can't offer others emotional steadiness if you haven't developed it in yourself.
This is not about suppressing what you feel. Leaders who perform emotions they don't have, projecting a manufactured calm or a forced positivity, are often sensed as inauthentic. Research by Grandey (2003) on emotional labour shows that surface acting (displaying emotions you don't feel) leads to burnout and is less effective than deep acting (genuinely regulating your inner state to align with how you want to show up). The goal is real regulation, not performance.
The good news? Emotional self-regulation is a learnable skill. Practices like mindfulness, reflective journaling, coaching, and somatic awareness all build the capacity to notice what's happening inside you before it spills out in ways that affect your team. These aren't wellness indulgences. They are leadership disciplines.
Five Things You Can Start Doing Now
If this has landed with you, here are five concrete places to start.
1. Get curious about your emotional baseline. Before your next team meeting, pause and genuinely check in with yourself. What are you feeling? What are you carrying in? You can't choose what to put down if you don't know what you're holding.
2. Treat self-regulation as a professional priority. Sleep, movement, boundaries, recovery time, regular coaching: these aren't personal luxuries. They are the conditions under which emotionally intelligent leadership becomes possible. If you're chronically depleted, your team will feel it.
3. Ask for honest feedback on your emotional impact. This one takes courage. But ask a trusted colleague, a direct report, or a coach: what emotional tone do I seem to bring into the room? What does it feel like to be in a meeting with me when things are stressful? The answers can be genuinely revelatory.
4. Build psychological safety deliberately. Make it easy for people to tell you hard truths. Thank people when they push back. Acknowledge when you don't have the answers. Model the kind of vulnerability that says, "we can talk about what's real here." It takes time to build, and almost no time to destroy.
5. Remember that you are always modelling. Even when you think you're just "getting through the day," your team is watching and learning from how you handle it. The way you respond to bad news, how you treat people when you're under pressure, the energy you bring on a Monday morning: it all matters. You are the culture, in motion.
The Bottom Line
Organisational culture doesn't live in a values document. It lives in the daily experience of the people inside your organisation. And that experience is profoundly shaped by the emotional world of those who lead.
Your emotions are not a side issue to your leadership. They are central to it. The question isn't whether your emotional state will affect your team. It already is. The question worth sitting with is this: what do you want to be spreading?
That's where the real leadership work begins.
References
Bandura, A. (1997). Self-efficacy: The exercise of control. W.H. Freeman.
Barsade, S. G., & Gibson, D. E. (2012). Group affect: Its influence on individual and group outcomes. Current Directions in Psychological Science, 21(2), 119–123.
Edmondson, A. (1999). Psychological safety and learning behavior in work teams. Administrative Science Quarterly, 44(2), 350–383.
Goleman, D. (1995). Emotional intelligence: Why it can matter more than IQ. Bantam Books.
Goleman, D., Boyatzis, R., & McKee, A. (2002). Primal leadership: Realizing the power of emotional intelligence. Harvard Business School Press.
Grandey, A. A. (2003). When "the show must go on": Surface acting and deep acting as determinants of emotional exhaustion and peer-rated service delivery. Academy of Management Journal, 46(1), 86–96.
Hatfield, E., Cacioppo, J. T., & Rapson, R. L. (1993). Emotional contagion. Current Directions in Psychological Science, 2(3), 96–99.
Rizzolatti, G., & Craighero, L. (2004). The mirror-neuron system. Annual Review of Neuroscience, 27, 169–192.
Sy, T., Cote, S., & Saavedra, R. (2005). The contagious leader: Impact of the leader's mood on the mood of group members, group affective tone, and group processes. Journal of Applied Psychology, 90(2), 295–305.
Developing leaders who lead with emotional intelligence
Dr Carin Bergh, Best of People Consulting, www.bestofpeople.co.za