But if you are a lawyer preparing for a significant negotiation, an academic trying to secure funding or collaboration, an adviser working through a transaction or an executive about to have a conversation worth millions of dollars, I think you need to read the room much earlier than that.

In fact, if you have control over the environment, the first room you need to read is the one you are creating.

What does someone experience before the substantive conversation even begins?

Because underneath almost every business decision is one very simple question: can I trust this person?

We are answering that question about people all day long, usually without even realising we are doing it. We notice how someone speaks, how they explain something, what they look like, what their website looks like, the photographs they use, the language they choose, whether we have heard their name before, who else appears to trust them, whether their story stays consistent and whether we can actually verify what they are telling us. Sometimes we cannot even explain why, but something just feels off.

The first thing you notice, walking into a prison for the first time, is that no one is confused about power.

Inmates know exactly who holds authority, who defers to whom, which alliances are real and which are performed, and who is being watched and why. They know it because misreading those dynamics has consequences that are immediate and physical. The social intelligence required to survive in that environment is not theoretical. It is operational.

I spent thirteen years working in and around courts, prisons, and law enforcement in criminal intelligence. And when I eventually began working with corporate leadership teams, I noticed something that surprised me at first and now seems obvious.

There is an industry worth hundreds of millions of dollars built on a single, seductive idea: that the human body is a reliable decoder ring. That crossed arms mean defensiveness. That looking up and to the right means lying. That a firm handshake predicts success.

It is almost entirely fiction.

There is a moment in every difficult meeting that most people miss.

It lasts less than a quarter of a second. It crosses the face of the person sitting across the table — the senior partner, the client, the board member — and then it is gone. Replaced, almost instantly, by whatever expression they intended you to see.

That moment is called a micro-expression. And in thirteen years working in law enforcement, learning to catch it was not optional.

In the boardroom, it is the difference between a deal that closes and one that quietly dies.