A Chief of Staff (CoS) is the senior operator who runs the apparatus around a principal so the principal can focus on the work only they can do. In UHNW private service, the role sits at the top of the support function: above an EA or PA, alongside or beneath a COO or Family Office Director depending on the structure.
This article gives the working definition, the typical scope, and the most important distinctions from related roles. For the deeper guide on the CoS in a family office, see The Chief of Staff in a Family Office.
A Chief of Staff manages the principal's time, decisions, and operating environment. They are not an executor of any single function. They make sure the right things happen, in the right order, with the right people, at the right time.
Five responsibilities sit at the centre of every Chief of Staff role.
Filtering information. What reaches the principal, in what form, when. A strong Chief of Staff prepares decisions, so the principal sees options ready to choose, not raw inboxes.
Closing out decisions. A decision becomes an action with an owner, a deadline and a follow-up. The Chief of Staff holds the loop from decision to delivery.
Coordinating across functions. Finance, legal, household, philanthropy and investments. The Chief of Staff holds the seams between these teams and makes sure they work together.
Anticipating. Surfacing problems and opportunities before the principal would have noticed them. This is what distinguishes the role from a senior EA.
Holding the principal's time. Calendar, preparation, briefings and follow-up after meetings. The principal's productivity hour by hour is the Chief of Staff's job.
The exact emphasis shifts by household. Some CoS roles are heavily operational. Some are heavily strategic. All have those five core threads.
In a private office, the CoS reports directly to the principal. They sit above the EA or PA layer. They may sit alongside or above the House Manager and Estate Manager depending on structure. In a family office, the CoS may report to the principal, to a Family Office Director, or operate as the senior operator without a director above them. For more on family office structures see Private Office Team Structures at Different Stages.
The role is rarely a public title. Some CoS operate under titles like "Director of the Office," "Principal's Operator," or "Head of Private Office." The job is the same. The title is the household's preference.
The category is full of overlap. The distinctions matter when scoping a hire.
EA versus CoS. An EA executes within scope set by the principal. A CoS sets the scope, holds it, and brings the EA into the work where appropriate. An EA running a complex household without a CoS often becomes a CoS in everything but title. For the full comparison see EA vs PA vs Chief of Staff.
Family Office Director versus CoS. A Family Office Director runs the family office as an institution: governance, investment platform, legal, tax, multi-generational planning. A CoS runs the principal. Many small offices have one person doing both. As the office grows, the roles split. For more on the FOD role see What Is a Family Office Director?.
COO versus CoS. A COO runs operations with formal authority over functional teams. A CoS runs the principal's environment with influence and access. Both are senior. The lines of authority differ.
House Manager versus CoS. A House Manager runs the residence. A CoS runs the principal. In smaller setups, a senior House Manager covers some of the CoS scope informally. For the household-side comparison see House Manager vs Estate Manager vs Head of Household.
Not every UHNW household needs one. Many run effectively on a strong EA, a good House Manager, and the principal's own organising preferences.
A Chief of Staff becomes necessary when one or more of the following are true.
The principal's time is bottlenecking material decisions across multiple functions.
The team has grown to the point where coordination between finance, legal, household, philanthropy, and investment is breaking down without a single point of authority.
The principal is travelling more, splitting attention across geographies, and decisions are slowing.
The previous senior support hire has plateaued at "doing more EA work" rather than running the operating environment.
Hiring a CoS prematurely creates more friction than it solves. Hiring one too late means months of strategic decisions that did not get the attention they deserved. The right moment is the harder judgement than the role itself.
Three behaviours decide the difference, and they are visible within the first ninety days.
Information judgement. A strong Chief of Staff filters hard. They know what the principal needs to see and what the team should handle without escalation. A weaker one forwards everything and leaves the principal to sort it.
Decision discipline. A strong Chief of Staff turns a decision into an action in the same conversation: written down, owned, dated and followed up. A weaker one notes the decision and watches it go cold.
Calm under pressure. When something goes wrong, a strong Chief of Staff contains it, escalates appropriately and protects the principal's time. A weaker one passes the stress upwards.
Few candidates arrive with all three. Many can build them within two years, and that is usually who principals hire.
A representative day for a Chief of Staff in a London principal residence.
Morning. Walk through the principal's day with the EA before the principal arrives. Confirm preparation for each meeting, identify the decisions the principal will need to make, and process anything that came in overnight.
Through the day. Move between the principal, the team and the work. Stay accessible without being constantly visible. Keep a running list of decisions and follow-ups, and coordinate with finance, legal or the household where their work meets the principal's.
Late afternoon. Review the day with the principal where time allows. Surface anything for tomorrow and brief the team on the day's decisions.
Evening. Finalise tomorrow's preparation and check the calendar. Close anything that should not reach the principal unresolved.
The rhythm rarely repeats exactly. The strongest find it, hold it under pressure and adjust without drama when it breaks.
Becoming a senior EA. Sliding into pure execution instead of holding the operating environment. The principal hired a Chief of Staff for a reason; full-time EA work leaves that function empty.
Loyalty in one direction only. A strong Chief of Staff speaks for the team to the principal as well as for the principal to the team. One who only carries instructions downwards loses the team's trust within months.
Missing what the principal does not say. Reading the unspoken concern and raising it before it grows. A weaker Chief of Staff waits for instructions.
Letting decisions go cold. The most common failure. A decision made in March, never actioned, returns in July as a problem.
For the structural mistakes that undermine the role, see Common Hiring Mistakes in Private Offices.
Chief of Staff compensation in 2026 in a UHNW UK setting is typically £180,000 to £320,000 base with bonus of 30% to 60% for senior roles. US ranges sit 25% to 50% above. For the deeper compensation discussion see our Private & Family Office Salary Guide.
Scope varies enormously. Three principals all employing a "Chief of Staff" can have wildly different role definitions. For more on what good scoping looks like see Common Hiring Mistakes in Private Offices.
For the full guide on the role in a family office, including how it evolves with the office and how to hire one, see The Chief of Staff in a Family Office.
To compare against the related roles see EA vs PA vs Chief of Staff.
For current vacancies see our job board. If you are hiring, start a search.
Managing Director
A Chief of Staff manages the principal's time, decisions, and operating environment. The role focuses on filtering information so the principal sees decisions ready to make, closing out decisions into actions and follow-ups, and coordinating across the wider team (finance, legal, household, philanthropy). They are not an executor of a single function. They make sure the right things happen at the right time across the principal's whole apparatus.
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