What Does a Chief of Staff Actually Do? The Definitive UK Guide

You’ve heard the title. You’ve seen it appearing more frequently in job descriptions, LinkedIn profiles, and leadership team bios. But when someone asks what a Chief of Staff actually does on a Tuesday morning, the answer is rarely straightforward.

That ambiguity is by design. The Chief of Staff role in the UK is one of the most context-dependent positions in business, shaped almost entirely by the leader it supports, the organisation it sits within, and the stage of growth the business is at. There is no single job description that covers every version of it.

This guide explains what the role genuinely involves, how it differs from other senior positions, and what it looks like across different types of UK businesses, so that whether you’re considering hiring one or exploring whether it’s the right career move for you, you’re working from an accurate picture.

A Simple Definition (That Actually Makes Sense)

The Chief of Staff is a senior leadership role that sits alongside the CEO, founder, or executive team. Not below them in a traditional reporting line, but at the centre of how the organisation thinks, moves, and executes. Their job, at its core, is to protect the leader’s focus and accelerate the organisation’s priorities. They do this by taking ownership of the things that would otherwise land on the CEO’s desk and either slow them down or distract them from higher-value work.

In practice, this means a CoS is simultaneously a strategic adviser, an operational troubleshooter, a project lead, and a communication bridge, depending on what the business needs most at any given moment.

What a Chief of Staff Does Day-to-Day

Because the role is so variable, it is more useful to think in terms of core functions rather than a fixed list of tasks. In most UK businesses, a Chief of Staff operates across five areas:

• Strategic alignment: ensuring that the organisation’s priorities are clearly defined, regularly reviewed, and consistently communicated across the leadership team. The CoS is often the person who runs the rhythm of the business, for example, board prep, leadership offsites, quarterly planning cycles.
• Project ownership: taking responsibility for cross-functional initiatives that matter to the business but don’t fit neatly into any single department’s remit. The CoS ensures these don’t fall through the cracks.
• Executive leverage: acting as the CEO’s proxy in meetings, conversations, and decisions where the CEO’s presence isn’t essential but their perspective needs representing. This frees the leader’s time for where they are irreplaceable.
• Organisational connectivity: building relationships across the business to ensure information flows upward, decisions flow downward, and teams remain aligned. The CoS is often the person who knows what’s really happening at every level.
• Special projects: leading discrete, high-priority initiatives, for example, a new market entry, an operational review, a leadership restructure, that sit outside the normal workflow and require someone with both strategic thinking and execution capability.

On any given day, a Chief of Staff might be preparing materials for an investor update, sitting in on a product strategy session, resolving a resourcing conflict between two departments, and briefing the CEO before a board call. The common thread across all of it is impact. Everything they do moves the business forward.

The Chief of Staff and the CEO: How the Relationship Works

The most important relationship in any Chief of Staff role is the one with the leader they support. This is not a traditional manager-report dynamic. A CoS needs to be able to challenge the CEO’s thinking, push back on decisions, and raise uncomfortable truths, while maintaining the trust and discretion that makes them genuinely useful.

The best Chiefs of Staff describe the relationship as operating in the blind spots. They see what the CEO can’t see from where they sit, and they say it clearly. That combination, proximity, candour, and discretion is rare, and it is what separates an exceptional CoS from a capable operations manager.

It also means the hiring process for a Chief of Staff is unusually personal. Technical capability matters, but so does the chemistry, the communication style, and the values alignment. A CoS who is the right person for one CEO may be entirely wrong for another.

Chief of Staff vs EA vs COO: What’s the Difference?

Three roles are frequently confused with the Chief of Staff, and understanding the differences matters both for businesses deciding which hire to make, and for individuals working out which career path fits them.

The Executive Assistant focuses on protecting the CEO’s time and operational efficiency: diary management, travel, correspondence, and ensuring the executive can function at full capacity day-to-day. An exceptional EA is invaluable and act as an extension of their executive. Although their remit is becoming increasingly strategic, they generally optimise the system that already exists.

The Chief of Staff focuses on the CEO’s priorities and strategic progress. They are not managing the diary; they are deciding which meetings should be in it. They are not sending the emails; they are shaping the decisions behind them. This is a different set of capabilities, not a higher version of the EA role, but a distinct one.

The Chief Operating Officer is typically a more senior, more permanent leadership role with direct line management responsibility across operational functions. The COO runs the machine. The Chief of Staff ensures the CEO’s relationship with the machine is as effective as possible, and often, for fast-growing businesses, a CoS is the hire that makes sense before the business is ready to justify a COO.

How the Role Varies by Business Type

The Chief of Staff role is not one thing. Its shape changes depending on the type of organisation it sits within, and understanding those differences is important if you are either hiring or considering the role.

In scale-ups and venture-backed businesses, the CoS is often a first-time hire into the role, brought in to give the founder breathing room, introduce operational rigour, and ensure the business can scale without the CEO becoming the bottleneck. The profile here is typically someone who can live with ambiguity, build from scratch, and move quickly. The role is broad, fast-paced, and highly generalist.

In PE and VC-backed portfolio companies, the CoS often operates at the intersection of investor relations, operational performance, and strategic execution. They need to understand the language of value creation, work to aggressive timelines, and maintain relationships with multiple stakeholders simultaneously. Speed and discretion are non-negotiable.

In large corporates and enterprise businesses, the CoS typically supports a divisional MD or C-suite executive. The role is often more specialised, more process-driven, and more focused on internal alignment across large, complex organisations. Stakeholder management and political intelligence tend to be more prominent skills than in a startup environment.

In SMEs and owner-managed businesses, the CoS is increasingly recognised as the hire that professionalises the business. For owners who have been running everything themselves, bringing in a CoS can be transformational, but it requires significant trust, and often a period of education on what the role should and shouldn’t involve.

Does Your Business Need a Chief of Staff?

There is no single threshold at which hiring a Chief of Staff becomes the obvious answer, but there are patterns we see consistently in the businesses where the hire has the most impact.

You are probably ready to consider a Chief of Staff if:

• Your calendar is consistently full of meetings that you could delegate or deprioritise, but nobody else owns them
• You find yourself updating the same people on the same things repeatedly, because nothing is being joined up
• Strategic priorities are slipping because the operational demands of the business keep pulling focus
• You have a strong EA who is being used in ways that are stretching the role beyond its natural scope
• You are approaching, or in the middle of, a period of significant change: a fundraise, a restructure, a new market entry, and you need someone who can hold the centre

Equally, the hire is unlikely to work if you are not yet ready to share information, delegate authority, and have someone in the room for your most important conversations. A Chief of Staff only delivers their full value when the relationship with the CEO is genuinely open.

If you are unsure whether your business is at the right stage, or whether the role should be a CoS, a COO, or a senior EA, that is exactly the conversation we have with clients at the beginning of a brief. Getting the role definition right before you start looking is the most important part of the process.

Looking to hire a Chief of Staff in the UK?  Lily Shippen specialises in Chief of Staff recruitment across the UK, from scale-ups making their first senior operational hire to PE-backed businesses that need an exceptional operator at pace. With a 92% placement conversion rate and 300+ five-star reviews, we know what great looks like for this role.  Tell us about your brief →  Looking to hire