Homophily: What Is It and Why Should You Care as a Manager or Leader?

Research shows that opportunities and value within our networks are often generated by people who do not think or act like us. Understanding homophily is one of the most useful things a manager can do to improve their leadership.

What is homophily?

Homophily is the tendency for people to associate with, and form connections with, others who are similar to themselves. The concept was formalised by sociologists Miller McPherson, Lynn Smith-Lovin and James Cook in their landmark 2001 paper "Birds of a Feather: Homophily in Social Networks", published in the Annual Review of Sociology. Their conclusion was straightforward: similarity breeds connection. We tend to gravitate toward people who share our background, values, worldview, communication style and ways of working.

At a social level, this is entirely natural and largely harmless. But in professional and leadership contexts, homophily creates a significant and underappreciated problem. When the people around us all think in similar ways, we receive a narrow range of input, challenge and perspective. We mistake consensus for correctness. We surround ourselves with people who confirm our existing views rather than people who stretch them.

And because the effect is largely unconscious, most leaders do not notice it happening until the consequences become visible. Decisions that in retrospect were obviously flawed. Talented people who felt they were not being heard. Teams that produced reliable outputs but never generated genuinely new thinking.

Why this matters for managers and leaders

The implications of homophily for managers are more significant than most appreciate. When you hire, promote and build relationships primarily with people who are like you, you limit the range of thinking available to you. You also limit the range of experience available to your team. And you risk creating a culture where certain types of people, and certain types of thinking, are systematically undervalued.

Network research consistently shows that the most valuable information and opportunities tend to arrive through what sociologists call "weak ties": connections that are less frequent, less intimate and typically with people who are quite different from us. Your close colleagues, the people you talk to every day and who think in similar ways, are likely to share most of the information and perspectives you already have. It is the more distant and diverse connections that bring something genuinely new.

This is what David Burkus, in his book "Friend of a Friend", refers to as the "friends of friends" principle. The people two steps removed from your immediate network are often where the real value lies, precisely because they occupy different worlds, hold different knowledge, and see problems from angles you have not considered.

For leaders, this has direct consequences for decision quality, team diversity, innovation capacity and the ability to anticipate challenges before they become crises. A leadership team that is cognitively homogeneous, regardless of how diverse it appears on other dimensions, is more likely to make confident but flawed decisions because there is no meaningful internal dissent.

A simple test for your network diversity

David Burkus offers a practical diagnostic for assessing the diversity of your professional network. Consider the ten people you interact with most frequently in a professional context. How similar are they to you in terms of background, career experience, industry, functional specialism, communication style and ways of approaching problems?

If most of them are broadly similar to you, that is useful information. It does not mean your network is a failure. It means it may be optimised for comfort and efficiency at the expense of variety and challenge. And if you are in a leadership role, that trade-off has real costs.

The follow-up question is equally important: who are the people two steps removed from your network? Who are the connections of your connections? Are they people who would bring genuinely different perspectives into your orbit? Or are they largely the same kinds of people you already know, just wearing different job titles?

What to do about it

The good news is that awareness of homophily is itself a meaningful intervention. Once you understand the tendency, you can begin to notice when you are defaulting to it and make more deliberate choices.

Start by actively building relationships with people who are genuinely different from you: different functional backgrounds, different career paths, different ways of approaching problems. Not as a box-ticking exercise, but as a genuine investment in the quality of your thinking and decision-making.

In hiring and promotion decisions, challenge yourself to consider whether you are being drawn to candidates because of their genuine capability or because they remind you of yourself. The two are not the same, and conflating them is one of the most common and costly mistakes leaders make.

Create deliberate space for dissenting voices within your team. The person who consistently sees things differently is not necessarily a problem to be managed. They may be the most valuable source of challenge you have. The question is whether your culture makes it safe for them to speak and whether you have developed the leadership maturity to hear them properly.

And extend your network intentionally. Attend events outside your usual industry. Read in fields adjacent to your own. Follow thinkers who do not already share your perspective. The goal is not to expose yourself to more information. It is to expose yourself to genuinely different kinds of thinking, and to build the relationships that make that possible on an ongoing basis.

Understanding homophily will not make you a perfect leader. But it will make you a more self-aware one. And in a world where leadership quality is increasingly the differentiating factor between organisations that adapt and those that do not, that awareness is worth cultivating.