The 90-Day Fiction

Let me tell you about a fiction so deeply embedded in executive culture that everyone repeats it with total confidence and nobody stops to check whether it's true.

The fiction goes like this. The first 90 days of a Chief of Staff hire are the most important ones. Make your mark. Prove your value. Hit the ground running. Be visible. Be impactful. Dazzle everyone before the quarterly review.

It's a great story. It has the tidy three-act arc of a movie where somebody sprints through an airport: underdog arrives, works impossibly hard, wins by the third act. Everyone loves it. It also has approximately nothing to do with how this role works. Evaluating a Chief of Staff at the 90-day mark is the organizational equivalent of judging a marriage by the rehearsal dinner.

What's Happening in the First 90 Days

You arrive. You smile at everyone. Everyone smiles back with the practiced warmth of people who are sizing you up and have no intention of telling you anything useful yet.

You attend meetings. Many meetings. Meetings about meetings. You take notes and try to work out which version of events each person in the room believes, versus which version they're performing for the CEO at the head of the table. (Because those are often distinctly different versions.)

You start mapping the organization. Not the org chart, which in most companies is a work of near-total fiction, but the real one, where decisions get made. You learn that the most influential person in any given room almost never holds the most impressive title. You pick up the history—the old grievances, the failed initiatives, the reorg nobody has forgiven, the executive who left under circumstances no one will explain — but everyone references obliquely when they think you aren't paying attention.

But you’re a chief of staff. You’re always paying attention.

You are also, in these first 90 days, not trusted. Not fully. Not by anyone. None of which is about your credentials or your personality. It's the nature of a job whose only real currency is access, and access gets granted late. Trust here accumulates rather than transfers, it compounds slowly, and then somewhere around month six or seven it tips. Suddenly you're in rooms you weren't in before. People tell you things they weren't telling you a month ago. The operating picture sharpens, and the first 90 days start to look like a map drawn by a preschooler who hasn’t ventured far from his house and the playground with the sandbox.

“The first 90 days aren't where the work happens. They're where you earn the right to do it.”

What The 90-Day Myth Costs You

Assess a Chief of Staff at the 90-day mark and you are measuring exactly one thing, which is their ability to perform competence under observation, before they have the information, the relationships, or the standing to exercise any of it.

That's a real skill. It's also the skill of a good candidate in a good interview, which you already tested for.

The Chiefs of Staff who impress most at 90 days are frequently not the ones still delivering at 18 months. The ones who look best in the first quarter often skipped the listening phase, moved fast, made promises the organization couldn't keep, and built on sand. Sand collapses. Usually somewhere around Month Eight, right about when you'd started congratulating yourself.

The ones who seem underwhelming at 90 days, still asking questions, still mapping the terrain, still in listening mode when you wanted action mode, are frequently the ones doing it right. They're building on rock, which takes longer to lay and looks like nothing at all for a while. Inconvenient for everyone who wanted visible results by Q1.

And to the founders who retort, "If I can't see visible results in three months, you're useless to me." Ok, tough guy, relax. A Chief of Staff with genuine authority — empowered to make changes and decisions — can do noticeable and useful things inside two weeks. Profoundly broken processes aren’t exactly hard to spot. A lot of the places I've observed or advised could be radically improved by a… meeting agenda. It's magical when you know what you're going to talk about!

What Happens Between Month 6 and Month 18

This is where the job becomes the job.

By month six you know which conversations have to happen before which meetings, who needs to be in the room, who needs to be briefed afterward, whose concerns get handled in advance and whose objections are coming no matter how well you prepared. You know how your C-suite behaves under pressure: who is competing with whom, who gets sharper when things go wrong and who falls apart, who wants it straight and who has to be walked there slowly.

None of that is knowable in 90 days, and most of it still isn't at six months. The full picture, the one that lets you walk into a room and know what's about to happen before anyone speaks, takes the better part of a year. Sometimes longer.

Which is why I tell every executive I work with to stop grading the first quarter and start watching whether anyone will tell them the truth. (I have come to sort of hate what "psychological safety" has been made to mean, but there's no question people need to believe they won't get punished for saying it.)

The Arc, When It's Working

Months 1–3. Orientation. You're learning the culture, the history, the people, the unwritten rules, the written rules nobody follows, and where the bodies are buried. You are listening far more than you are doing. The ratio feels wrong to everyone, including you. But here’s a secret between you and me: It's the right ratio.

Months 4–6. Early Trust. You've demonstrated judgment a few times. People start testing you with small confidences and watching what you do with them. Your CEO begins relying on you in small ways that turn out to matter.

Months 7–12. Operational Integration. You have enough trust to be in the rooms where things get decided, and enough pattern recognition to catch problems before they arrive. Things start happening that couldn't have happened without you, and because the role is working properly, nobody is entirely sure how they happened. That's also the job.

Months 13–18. Full Weight. This is the Chief of Staff the organization hired. Deep enough relationships to have the hard conversations, and enough institutional knowledge to know what a given decision will actually cost three departments over. This is when the hire pays for itself, usually several times.

Which brings me to the 18-month rotation model, where you engineer an expiration date into the most trust-dependent senior role in the building. It's one of the more expensive ideas circulating in startup culture at the moment, because Month 18 is roughly when you start collecting.

Consider the two chiefs of staff people still name as the standard. James Baker ran Reagan's West Wing for the whole first term, 1981 to 1985, then swapped jobs with Donald Regan at Treasury. Regan lasted about two years in the role and left in the wreckage of Iran-Contra. Leon Panetta took over Clinton's West Wing in 1994, when it badly needed order, and stayed until 1997. Neither man was there forever. Both were there long enough that the operation changed shape around them, which is a different animal from being there for four quarters.

Build a checkout date into the role and what you've bought is organizational sabotage with a calendar invite and a LinkedIn post about “What I learned.”

So if you truly need a verdict at 90 days, make it one question. Is this person still listening? The ones who stopped around day 30 and started performing instead are the ones building on sand, and you won't find that out until Month 8, by which point the lesson costs real money.

Go find out. Ask your CFO what your new Chief of Staff has asked her lately. If the answer is "nothing in a while," you have your 90-day review.

The nine functions I believe are foundational to this role, regardless of the size or type of the organization, are at coulandgold.com/cos-framework. If you're building the job right now, start there.

One voice from inside the role. One from the blueprints. Same mission.

Subscribe to The Briefing