The Interim Family Office CEO: When It's Needed and What For
An interim family office CEO takes the executive seat on a fixed mandate, usually twelve to eighteen months, after a chief executive leaves or during a generational transition. The role keeps the office and its live projects running, works out the structural cause behind the gap, and helps the family recruit the right permanent leader.
What an interim family office CEO is for: keeping the office and its live projects running, understanding why the seat came empty, and helping the family choose the right permanent leader.
In brief
- An interim family office CEO takes the executive seat for a fixed period, usually twelve to eighteen months, while the family decides who leads next.
- The role keeps the office running: strategic projects (M&A, an investment or divestment phase), the team, and the external relationships that matter, in particular trusts and legal or tax work in progress.
- A chief executive who leaves overnight usually points to a structural cause. The interim leader works out what happened and realigns the office to the family's needs.
- The interim leader also helps the family recruit the next permanent CEO: someone who fits the family and can steward it through the decade ahead.
The leadership gap in a family office
Most single family offices are built around one person. A founder who knows every asset, every banker, and every reason a decision was made a decade ago. The office runs well because that person holds it together in their head.
Then the person steps back. Sometimes by choice, sometimes not. The office keeps moving, but it moves on habit. Payments go out, reports arrive, the diary fills. What goes missing is the judgement that used to sit at the centre of it.
This is the gap an interim family office CEO exists to cover.
What the role is
An interim family office CEO is a temporary operator who takes the executive seat while the family decides what comes next. The mandate is finite, usually twelve to eighteen months. The person runs the office day to day, keeps the relationships that matter warm, and hands over a working operation at the end of it.
The role is operational. An adviser gives the family a view and leaves them to act on it. An interim CEO acts. They sign, they decide within an agreed mandate, and they carry the office through a period when no permanent leader is in place.
It is temporary by design. The aim is continuity, not a new permanent fixture. A good interim leader works towards their own exit from the first week.
When a family brings one in
What we have seen most often falls into three situations.
The first is a sudden departure. A chief executive leaves overnight, or a founder falls ill, and the office is left without anyone who can hold the whole picture. The departure is not always the executive's choice. Sometimes they go for personal reasons; sometimes the family decides the relationship has run its course and asks them to step down. Either way the exit is abrupt, nobody else has the full map, and the family has no time to draw one.
The second is a planned transition between generations. The office was built around the founder, and the next generation is not yet ready, or not yet decided on who among them will lead. Appointing a permanent chief executive at speed is how families end up handing the office to whoever happens to be nearest, rather than to the right person.
The third is a reset. The office has drifted, costs have crept up, and the family wants someone to steady it before rebuilding. An interim leader stabilises first, so the permanent decision gets made from calm rather than crisis.
The common thread across all three is time. In each case the family faces a decision that deserves to be made carefully, and an office that cannot pause while they make it. The interim leader separates the two: the office keeps running on one track, and the family's choice about its future runs on another, at its own pace.
What the role actually does
The first job is to keep the office running. The strategic projects carry on: an M&A process, a phase of heavy investment or divestment continues on its own timetable rather than stalling because the leader has changed. The team stays in place and stays led. The external relationships hold, which matters most where trusts, or legal and tax work, are mid-course. These are the arrangements where a lapse in oversight is expensive and slow to repair. Continuity here is not passive caretaking. It is active protection of everything already in motion.
The second job is to understand why the seat came empty. When a chief executive leaves overnight, whatever the stated reason, there is usually a structural cause underneath it. The role was wrong for the office, the office was wrong for the family, or the two had drifted apart. The interim leader's task is to work out what actually happened, then put the changes in place so that the model of office fits the family and how it runs matches their real needs. A replacement hired before that work is done tends to inherit the same problem.
The third job is to help the family recruit the next permanent CEO. This is more than a search. It calls for a close read of the family: how it makes decisions, the personalities of the generation now in charge, and the ground the next leader will have to work. The aim is not the strongest CV. It is the right person to steward the family through the decade ahead, someone the family will trust and who fits the office as it now needs to be.
In practice
One Monday morning, a single family office was left without its chief executive. The person had walked out over the weekend, burnt out and unreachable, in the middle of a negotiation to sell a family asset. Four days later, one of our partners was in the interim seat.
The brief was meant to last three months. It ran to eight, and the extra time was the point. We held the live negotiation and closed it. We looked under the hood and found what the departure had been signalling: operational rigour had slipped, one team member was quietly corroding the others, and the channel between the family and the office had narrowed to the single voice that had just left. We reset the basics, replaced who had to be replaced, then briefed the family's headhunter and handed over to a permanent chief executive.
Eight months in, the family was running its own office again, with the deal closed and the right person in the seat. Read the full use case.
Why it protects the transition
The executive team a founder builds is rarely the team the next generation needs without change. You are never the right hand of two generations at once. The people who served one principal well may not be the ones to serve their children, and forcing that fit tends to cost the family both the team and the goodwill that went with it.
An interim leader gives the family room to make that change deliberately. The office keeps running. The next generation can watch, learn, and take on responsibility before they take on the title. The permanent appointment, when it comes, is a choice rather than a reflex.
Few families are ready for the change when it comes. Most have no clear plan for who will run the office once the current decision-makers step back: the share without one reached 86% in the J.P. Morgan 2026 Global Family Office Report, and only around a third have a succession plan for the office itself, according to the UBS Global Family Office Report 2026. An interim CEO does not close that gap on its own. It buys the time to close it well.
How to set the mandate
A few things separate an interim mandate that works from one that quietly drifts into permanence.
Scope it in writing. What the interim leader can decide alone, what needs the family, and what is off-limits should be clear before they start. Oral arrangements are where future conflict begins.
Set an end date, and mean it. The mandate should carry a defined length and a defined purpose: stabilise the office, document what one person knew, and prepare the ground for a permanent leader. A role with no end date becomes a permanent one by drift.
Report to the family, not around it. The interim CEO holds the executive seat, but the family holds the authority. Regular, plain reporting keeps it that way, and keeps the family the voice at its own table.
Plan the handover from the start. The measure of the role is the state of the office on the day the interim leader walks out: relationships intact, knowledge written down, a permanent leader ready to step in.
The point
An interim family office CEO is a bridge across the gap between one leader and the next. It keeps the office working through a departure, a generational handover, or a reset, without committing the family to a permanent choice made in a hurry.
The office is a tool. What matters is that the family keeps control of it through the change, and comes out the other side with the right person in the seat. That is what the role is for.
This is the kind of work Westwick is built for. We take the seat when a family needs it held, keep the office and its projects running, help the family find the leader who comes next, and then we step out. Because we are here to serve.
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