On Demand CMO: What Boards Get Wrong Before Hiring One

An on demand CMO is a senior marketing executive who works with a business on a flexible, project-based or retained basis, providing strategic leadership without the cost or commitment of a full-time hire. The model gives businesses access to CMO-level thinking precisely when they need it, and the ability to step back when they don’t.

It sounds straightforward. In practice, most businesses that explore this model spend the first few months solving the wrong problem.

I have watched this play out more times than I can count. A business brings in an on demand CMO because something is not working. Revenue is flat, the agency relationship has broken down, or the board has finally admitted that nobody in the building really owns marketing strategy. The brief is vague. The expectation is that the CMO will arrive, diagnose the problem, and fix it. What actually happens is that the CMO spends the first six weeks trying to get access to the right data, the right people, and a clear answer to the question: what does success look like here?

That is not a failure of the model. It is a failure of preparation. And it is almost entirely avoidable.

What Boards Get Wrong Before the Engagement Starts

The most common mistake I see is confusing a resourcing problem with a strategy problem. A business that has lost its marketing director and needs someone to manage the team for six months has a resourcing problem. That is a job for an interim CMO. A business that has a marketing team, an agency, and a budget but cannot explain why revenue is not growing has a strategy problem. That is a different brief entirely.

When those two briefs get conflated, the engagement starts on the wrong foot. The operator is either too senior for the task or too operational for what the business actually needs. Neither outcome is good.

I spent several years running an agency before I started working in a more advisory capacity, and the pattern was consistent across clients. The businesses that got the most from senior external resource were the ones that had done the internal work first. They knew their numbers. They had a view on where growth was supposed to come from. They had a CEO or a board who was genuinely willing to be challenged. The businesses that struggled were the ones that wanted a senior person to validate decisions that had already been made.

If you want a validator, hire a consultant. If you want someone to actually lead marketing, be prepared for the conversation to go somewhere you did not expect.

For a broader view of what effective marketing leadership looks like at the senior level, the Career and Leadership in Marketing hub covers the full landscape, from fractional models to full-time appointments.

The Real Job Is Not What the Brief Says

Every on demand CMO engagement has a stated brief and an actual brief. The stated brief is usually something like: build a marketing strategy, define the brand positioning, or improve performance across digital channels. The actual brief is almost always some version of: help us understand why this is not working, and tell us what to do about it.

Those are not the same thing. The first is a deliverable. The second is a diagnostic. And the diagnostic almost always reveals that the problem is not where the business thought it was.

I worked with a business a few years ago that was convinced its performance marketing was underperforming. The metrics looked weak. Cost per acquisition was high, conversion rates were low, and the agency was under pressure. When I looked at the full picture, the performance marketing was doing exactly what performance marketing does: it was capturing existing demand reasonably efficiently. The problem was that there was not enough demand to capture. The business had spent years optimising the bottom of the funnel while the top of the funnel had quietly dried up. Nobody had noticed because the performance numbers, in isolation, looked defensible.

This is something I have come to think about carefully over the years. Earlier in my career I overvalued lower-funnel activity. It is measurable, it is attributable, and it feels productive. What I have learned, sometimes the hard way, is that a lot of what performance marketing gets credited for was going to happen anyway. You are capturing intent that already existed. The harder, less measurable, more genuinely valuable work is creating new demand, reaching people who were not already looking for you. That is where growth actually comes from.

An on demand CMO who only looks at performance data will miss this entirely. The good ones look at the whole system.

How the Model Actually Differs from Other Flexible Arrangements

There is a cluster of overlapping models in this space and the terminology is used loosely enough that it is worth being precise. Fractional marketing leadership typically refers to a senior marketer who works across multiple businesses simultaneously, dedicating a defined portion of their time to each. An on demand CMO is a variation of this, but the emphasis is on availability and responsiveness rather than a fixed time allocation. The distinction matters because it changes how the engagement is structured and what the business can reasonably expect.

A CMO as a service arrangement tends to sit closer to the fractional model, with a defined scope and a more predictable rhythm. An on demand arrangement is more fluid. You are paying for access to senior judgment when you need it, not for a set number of days per month. That flexibility is the point. It is also the source of most misaligned expectations.

Businesses that are used to working with employees or retained agencies sometimes struggle with the on demand model because there is no fixed output they can point to. The value is in the decisions that get made better, the strategies that do not go down the wrong road, the board conversations that are grounded in commercial reality rather than marketing theatre. That is harder to measure than a campaign report, but it is not less real.

For businesses that need more hands-on execution support, a CMO for hire arrangement or a dedicated interim marketing director may be a better fit. The on demand model works best when the business has enough internal resource to execute and needs senior strategic input rather than day-to-day management.

What the Engagement Needs to Work

I have seen on demand arrangements succeed and I have seen them fail. The difference is almost never the quality of the operator. It is the quality of the conditions they are working in.

Three things matter above everything else.

First, access. An on demand CMO who cannot get in front of the CEO, the CFO, and the commercial leadership team is operating with one hand tied behind their back. Marketing strategy that is developed in isolation from commercial strategy is not marketing strategy. It is a document. The operator needs to be in the room where decisions are made, or at minimum in the conversation that informs those decisions.

Second, honest data. This sounds obvious, but the number of businesses that present their marketing data in a way that has been filtered through layers of internal politics is striking. I have sat in meetings where the numbers on the slide bore almost no relationship to the numbers in the underlying platform. Not because anyone was being dishonest, but because the reporting had been built to tell a comfortable story rather than an accurate one. An on demand CMO needs access to the actual data, including the parts that are uncomfortable.

Third, a mandate to challenge. This is the one most businesses say they want and the fewest are genuinely prepared for. If the on demand CMO identifies that the current agency is not performing, or that the brand positioning is wrong, or that the channel mix is built around habit rather than evidence, the business needs to be willing to act on that. If every recommendation gets softened, delayed, or quietly shelved, the engagement will produce a strategy document and not much else.

I spent time on the Effie Awards judging panel, which gives you a particular perspective on what effective marketing actually looks like versus what businesses claim it looks like. The gap between the two is wider than most people admit. The businesses that close that gap are the ones that are willing to hear difficult things and do something about them.

The Alignment Problem Nobody Talks About

One of the least discussed challenges in any on demand or fractional arrangement is internal alignment. When a full-time CMO joins a business, they spend their first months building relationships, understanding the internal dynamics, and earning the trust of the teams around them. That process takes time, but it is built into the role.

An on demand CMO does not have that luxury. They are expected to be effective quickly, which means the business needs to do some of that alignment work in advance. Who does the CMO report to? Who do they need buy-in from? Which internal stakeholders are likely to resist external input, and why? These are not soft questions. They are operational questions that directly affect whether the engagement delivers anything useful.

The businesses that handle this well brief their teams before the CMO starts. They explain what the engagement is for, what it is not for, and what they expect from the internal team in terms of cooperation. The businesses that handle it badly introduce the CMO to the team on day one and let the politics sort themselves out. They rarely do.

The Marketing Leadership Council framework is useful here as a reference point for how senior marketing leadership should be structured and supported within an organisation, regardless of whether that leadership is full-time or on demand.

When On Demand Is the Right Answer

The on demand model is genuinely well-suited to a specific set of circumstances. Businesses going through a period of strategic uncertainty, where the direction is unclear and the team needs senior guidance rather than management. Businesses that are scaling quickly and need CMO-level input to shape the marketing function before they hire into it permanently. Businesses that have a capable marketing team but lack someone to connect marketing activity to commercial outcomes at the board level.

It is less well-suited to businesses that need someone to manage a team through a difficult period, businesses that are in crisis and need immediate operational leadership, or businesses that have fundamental disagreements about what marketing is supposed to do. Those situations need different solutions.

The honest version of this is that the on demand model rewards businesses that are already reasonably well-organised and need senior strategic input to take the next step. It does not work well as a rescue operation. If the business is in genuine trouble, the level of engagement required is closer to what interim CMO services provide, with a more defined scope, a clearer mandate, and a more intensive time commitment.

I grew an agency from 20 to 100 people and turned a loss-making business into one of the top five in its sector. The periods of sharpest growth were never the ones where we had the most resource. They were the ones where we had the clearest thinking about where we were going and why. Senior marketing leadership, in whatever format, is most valuable when it provides that clarity. The format matters less than the quality of the thinking.

Choosing the Right Operator

The on demand CMO market has grown significantly, which means the range of quality has grown too. There are operators who have spent 20 years leading marketing at scale across multiple industries, and there are operators who rebranded themselves as fractional CMOs after a single in-house role. The title tells you nothing. The track record tells you everything.

When evaluating an operator, the questions that matter are specific. What businesses have they worked with, and what happened to those businesses while they were engaged? Can they show you the commercial outcomes, not just the marketing outputs? Have they worked in your sector, or in sectors that are commercially adjacent? Do they have a point of view on your situation before they have even seen your data, and is that point of view coherent?

The last point is underrated. A good senior marketer should be able to form a working hypothesis about a business’s marketing challenges from a 30-minute conversation. Not a final answer, but a direction. If the operator you are talking to is noncommittal, hedging everything, and waiting to see the data before forming any view at all, that is not rigour. That is caution dressed up as rigour. The two are not the same.

Sector experience matters, but it is not the whole story. I have managed ad spend across more than 30 industries, and the commercial patterns repeat more than people expect. The specific tactics change. The underlying logic of how marketing connects to revenue does not. An operator who has only ever worked in one sector may be technically proficient but commercially narrow. The best operators bring transferable commercial judgment alongside relevant sector knowledge.

Understanding how audiences are reached and influenced is also part of the picture. Platforms and channels evolve, and a senior operator should have a view on how social strategy and policy intersects with brand building, not just performance. Similarly, the way audiences segment and behave, including demographic-specific behaviour patterns, should inform strategy rather than be assumed away.

The broader context for all of this sits within how marketing leadership is evolving as a discipline. The Career and Leadership in Marketing section of The Marketing Juice covers the full range of senior marketing arrangements, from on demand to full-time, and the commercial logic behind each.

What Good Looks Like

A well-run on demand CMO engagement should produce three things. A clear commercial diagnosis: what is actually limiting growth, stated plainly without jargon. A prioritised strategy: not a list of everything that could be done, but a specific view on what should be done first and why. And a measurable plan: not a framework, but actual targets with actual timelines and actual accountability.

If the engagement produces a lengthy strategy document that nobody acts on, something has gone wrong. Either the operator did not connect the strategy to commercial reality, or the business did not have the internal conditions to act on good advice. Both are worth diagnosing before the next engagement begins.

The on demand model is not magic. It is a practical arrangement that gives businesses access to senior marketing judgment without the overhead of a permanent hire. When the conditions are right, it is highly effective. When they are not, it is an expensive way to produce a document. The difference is almost entirely determined by the work the business does before the CMO starts, not by what happens after.

For anyone thinking seriously about bringing in a senior marketing operator at this level, the single most useful thing you can do before any conversation is write down, in plain language, what problem you are trying to solve and what success looks like in 12 months. If you cannot do that clearly, you are not ready to hire. You are ready to think.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what works.

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