When everyone expects CS to own customer marketing on the side, both functions end up working harder with worse results. Here is a clear map of who owns what in post-sales, and where the overlap should be defined rather than improvised.
Ask ten B2B SaaS leaders who owns customer references and you will get ten different answers. Some say CS, because CSMs know which customers are happy. Some say marketing, because it feeds demand generation. Some say RevOps. Some admit nobody really owns it, and then look a bit uncomfortable.
This is not a trivial question. As companies mature and start building out dedicated customer marketing functions alongside CS teams, the overlap creates real friction. CSMs get pulled into case study coordination when they should be running QBRs. Marketing sends expansion campaigns to accounts the CS team already flagged as at-risk. Advocacy programs stall because nobody has clear authority to say yes. The problem is not that these teams want to fight. It is that the line was never drawn clearly enough for either team to operate without stepping on the other.
There is a version of this that works. But it requires being specific about who does what, not just agreeing that collaboration is good.
What Customer Marketing Actually Covers
Customer marketing is broader than most people give it credit for. It is not just a reference program or a once-a-year conference. At companies where it runs well, it covers five distinct areas: advocacy programs, reference management, case study production, user groups and customer advisory boards, and community.
Each of these requires someone who knows the customer base well, can identify the right accounts for the right purpose, and has the organizational authority to activate them. At most companies without a dedicated function, that person is a CSM who fits it in around their actual job.
The reason this defaults to CS is not bad org design. It is because CS carries the relationship intelligence that customer marketing runs on. To find a good reference customer, you need to know who is genuinely successful, who can speak clearly, and who is stable enough for public-facing exposure. That knowledge does not sit in a CRM field. It lives with the CSM who ran their onboarding, noticed when adoption dipped, and worked through two renewals with them.
But treating CS as the default owner of customer marketing has a cost. A CSM handling case study production, reference calls, and advocacy coordination on top of a full book of business will do all three worse than if one had a dedicated owner. The informal version of customer marketing works until it does not. And it stops working right when the company needs it most, usually when pipeline pressure rises and everyone suddenly wants references.
What Customer Success Actually Covers
Customer success is a relationship function. Its job is to help customers achieve outcomes with the product, which drives retention, reduces churn, and creates the conditions for expansion. It spans onboarding, adoption, health monitoring, renewal management, and proactive risk intervention.
The work is account-level and ongoing. A CSM is thinking about the specific customer in front of them. They are tracking usage signals, reading the room in EBRs, managing executive relationships, and trying to time expansion conversations correctly. That requires depth of context that is fundamentally different from what customer marketing does.
Kelly McGuire, VP of Customer Success at Everstage, described the philosophy behind this on the Across the Funnel Podcast:
“Customer success, and I’ve said this to every person I could, is really truly an organization that owns customer obsession across all aspects… We have something that basically sales captures during the sales process and that gets transferred over to us in CS, so that we have what I’ll call situational fluency in understanding why the customer purchased, what their buying decisions were, what the challenges were.”
That situational fluency is the core asset CS brings to post-sales. And it is exactly what customer marketing depends on to work. The distinction matters: CS builds and carries the relationship. Customer marketing activates it for broader company goals.
The Ownership Question That Keeps Getting Punted
The reason the boundary is hard to draw is that the inputs are shared even when the outputs are different. A CSM identifying a customer who would make a good case study is doing CS work. But coordinating the approval process, writing the story, getting it through legal, and publishing it is customer marketing work. If the CSM has to do both, one of them suffers.
The same is true for references. A CSM staying close to customer relationships naturally knows who to tap for a reference call. But managing a reference pool at scale, tracking which customers have been asked how many times, matching prospects to the right reference profile, and building tiered incentive structures for participation is a program management job that does not belong on a CSM’s plate.
The companies that handle this well do not remove CS from the equation. They separate the identification and relationship work (CS) from the activation and program work (customer marketing). A CSM flags a customer as a potential advocate. Customer marketing decides when and how to activate them, tracks the output, and connects it to pipeline or retention outcomes. Two functions, shared data, clear handoff.
Where the Lines Blur and Why It Matters
Some of the hardest ownership questions are the ones that look like marketing but feel like CS. Expansion campaigns are a good example. If marketing sends a campaign to existing customers about a new product tier, and a customer responds with questions, who handles it? If the account is strategic, CS probably should. If it is a self-serve segment, marketing might. The problem is that nobody has defined this, so the campaign fires, the response comes in, and someone improvises.
Sara Archer, CRO at ChartMogul, talked about this directly on the Across the Funnel Podcast. She described the difference between a mass product update campaign and what a more targeted approach looks like:
“The traditional product marketing playbook would just be to email everybody and say, hey, look at this new feature. We’ve updated our Stripe integration. But for all of your Recurly users or your Chargebee users, that product marketing update is largely irrelevant. What would it look like if you could say, actually, I know what Sara at ChartMogul cares about and I’m going to deliver only the feature updates to her that are relevant for her role and how she engages with our product.”
That kind of segmentation requires CS-level account context. Marketing has the channel. CS has the signal. Neither can do it well without the other. The question is not who owns the campaign. The question is who owns the insight that makes the campaign work, and whether that insight is flowing between functions or siloed in individual CSM notes.
Case Studies: The Most Contested Piece of Real Estate in Post-Sales
Case studies are where the CS vs. customer marketing tension gets loudest, because the stakes are high and the inputs come from multiple places. Marketing wants them for pipeline. Sales wants them for late-stage deals. CS has to navigate the customer relationship without burning goodwill by asking too often or asking at the wrong time.
Steve Benson, Founder and CEO of Badger Maps, made the case on the Across the Funnel Podcast that the post-sale relationship itself is the pipeline for this kind of content:
“Meeting with customers after the sale, whether it’s an executive or a customer success associate, someone who’s in charge of the relationship post-sale, I think that lowers churn, builds trust and enhances communication, gets customer case studies. That face-to-face interaction is valuable there too.”
He is right that the relationship is the prerequisite. But the relationship is not the same as the program. CS maintains the relationship. Customer marketing builds the pipeline of stories, manages approvals, and turns individual conversations into scalable content. The moment you expect a CSM to manage their book of business AND produce case study content on a consistent cadence, the content will lose.
At companies with a formal customer marketing function, the CSM stays in the account and flags readiness. Customer marketing handles the rest. That is not removing CS from the process. It is letting each function do what it is actually good at.
How to Draw the Line in Practice
The cleanest framework is this: CS owns the relationship. Customer marketing owns the activation of that relationship for business outcomes.
More specifically:
CS retains ownership of account health, renewal strategy, expansion timing, and the customer relationship itself. A CSM should be able to tell you which customers are happy, which are at-risk, which are positioned for growth, and why. That context is the raw material. It should not be held in their heads. It should be documented, structured, and accessible to customer marketing when they need to pull from it.
Customer marketing owns the program layer. Reference programs, case study pipelines, advocacy tiers, community moderation, and the campaigns that reach the existing customer base. They draw on CS relationship intelligence, but they build the structure around it. They measure the output. They track which customers are being activated for what purpose and at what cadence.
Where they overlap deliberately, the boundary should be explicit. Who approves a customer for public-facing use? CS, because they know the relationship. Who manages the approval workflow after that? Customer marketing, because it is a program function. Who handles follow-up questions from an expansion campaign? Defined by segment and revenue threshold, not left to whoever picks up the email.
Customer success operations plays a role here too. The tools, data flows, and playbooks that let CS and customer marketing operate from the same view of the account are not built by accident. Someone has to own the infrastructure that connects product usage, health signals, and relationship history into something both functions can act on.
The Expansion Question Nobody Wants to Answer
Expansion campaigns occupy a gray zone that trips up even well-organized teams. When marketing targets the installed base with upsell messaging, they are doing customer marketing. But the downstream conversation that results is often a CS problem, because the customer already has a relationship with a CSM and expects continuity.
The solution is not to make CS own the campaign. It is to give customer marketing enough account context that the campaign is appropriately targeted, and to define in advance who handles what comes back. For high-touch accounts, CS should be in the loop before anything goes out. For scaled or low-touch segments, marketing can operate more independently, but the segmentation should be grounded in actual account data, not just contract value.
The companies that get this right share a single source of account truth between functions. Net revenue retention goes up when expansion conversations reach customers at the right moment with the right context. That does not happen when CS and customer marketing are working off different pictures of the same account.
What a Working Model Actually Looks Like
At a post-sales team past the 50-customer mark, the informal version of customer marketing starts to break down. The company needs references but has no program. It wants case studies but has no pipeline. CSMs are fielding one-off asks and losing track of who has been asked for what.
A working model does not require a large team. A single person who owns customer marketing programs, sits close to CS, and has explicit authority to build the program layer is enough to get started. They pull on the relationship intelligence CS has built. They build the structure around it. They track output and tie it to pipeline, retention, and expansion metrics.
What makes it work is not the org chart entry. It is the shared data. CS and customer marketing need to be looking at the same accounts, the same health scores, and the same history of what customers have already been asked to do. Without that, the handoff is informal, the work duplicates, and the customer eventually starts declining requests because they cannot tell why so many people from one company keep contacting them.
Hyperengage is built on the premise that this kind of shared visibility is the baseline requirement for a post-sales team to operate without constant coordination overhead. When CS and customer marketing are drawing from the same account intelligence, the collaboration becomes much less contentious.
Conclusion
The ownership question between customer marketing and CS is not really about territory. It is about whether both functions have the clarity and context to do their actual jobs. CS cannot own customer marketing informally on top of a full book of business. Customer marketing cannot operate without the relationship intelligence CS carries. The friction between them is almost always a sign that the handoff is not defined, the data is not shared, or the authority is not clear.
Draw the line around the work, not the relationship. CS keeps the relationship. Customer marketing activates it. Define the overlap explicitly. Share the account data. And stop expecting CSMs to do both.
