The useful clue rarely arrives wearing a siren. It looks like an unfinished onboarding step, a feature ignored for three weeks, a champion who has stopped replying. By the time a subscription customer says goodbye, the evidence has generally been sitting around for months, scattered across product logs, emails, meeting notes and somebody's uneasy hunch. Mark Heys has spent much of his career making that sort of evidence legible.
He is the cofounder and chief technical officer of ChurnZero, the Washington, D.C.-based customer-success platform. The title offers the facts and hides the more interesting continuity. Heys began building commercial software when Windows point-of-sale applications counted as frontier work. He later spent roughly 16 years at Vocus, first leading development and then serving as CTO while the company matured into a public SaaS business. ChurnZero, founded in 2015, is not a departure from those chapters. It is their neatest expression.
All three concern the same practical magic: activity becomes data; data becomes context; context gives someone a chance to act. A cash-register transaction, a browser session and a customer's fading engagement may appear unrelated. To a systems builder, each is a trail of signals waiting for a useful interface.
First, build the till
The public record begins in 1992, when Heys founded Definitive Ideas, a software company focused on point-of-sale applications. The phrase now sounds almost quaint. At the time, putting a cash register's logic onto a Windows machine meant translating the untidy theatre of a shop floor into software: inventory, prices, payments, clerks, mistakes and closing time. A useful system had to notice the transaction and survive it.
After Definitive Ideas came a development-management role at Canadian technology consultancy T4G. Then, in December 1998, Heys joined Vocus to lead product development. He stayed long enough to see fashions in software come and go and one foundational shift settle in: software moved from boxes and installations to a service delivered over the internet.
In 2008, Vocus promoted him to chief technology officer. The announcement credited the development organization he led with award-winning public-relations software; the product had been named Best Business Productivity Software by the Software and Information Industry Association the year before. His remit expanded to include information technology. This was less a coronation than an enlargement of the machine room.
Two long builds, measured in years
A patent record from this period supplies a revealing footnote. Heys and Timothy Michael Fluehr are named as inventors of a web-browser-tracking method that used identifiers and cached files to recognize activity. Patents are written in prose only a machine could love, but the concern is recognizable: preserve a signal, connect it to context and make behavior visible. The European version was granted.
The customer-shaped hole
Vocus eventually became the place where the next company announced itself. Heys worked alongside You Mon Tsang, who was chief marketing officer while Heys was CTO. Tsang has described the imbalance they saw: marketing could inspect prospects through layers of intent data and segmentation, but teams responsible for existing customers often had little comparable help. Acquisition enjoyed an observatory. Retention got binoculars, if it was lucky.
The two executives did what technologists do before a category has a proper product. They improvised. Heys and Tsang dug into their own customer data by brute force and handed what they learned to customer-facing colleagues. The experiment exposed more than individual risks. It showed that customer-success teams were underserved by the software around them.
The founding insight was not that companies lacked customer data. It was that the data arrived in pieces, while the decision had to be made whole.
The answer became ChurnZero. Founded in 2015, the company combined product-usage data with the segmentation, automation and communication tools already familiar to sales and marketing. Its name is admirably blunt. Churn is the event everyone wishes to reduce; zero is the horizon that keeps receding as you approach it. It is both product brief and small corporate joke.
The logic beneath a customer-success platform
This matters because churn is a lagging indicator. A cancellation is a verdict, not an early warning. The operational work sits upstream: deciding which events count, which patterns deserve attention, when automation helps and when a person should enter the conversation. Heys's technical career had been excellent preparation. Transaction systems teach precision. SaaS teaches availability and scale. Tracking systems teach the value, and danger, of behavioral data.
The custodian of the evidence
A platform that centralizes customer behavior acquires an obligation along with its usefulness. In 2019, when ChurnZero announced that it had completed a SOC 2 Type 2 audit, Heys put the priority in plain terms.
“As a SaaS-based Customer Success company, our greatest priority is the privacy and security of our platform and customer data.”Mark Heys, ChurnZero CTO
The quote is corporate, but not ornamental. Customer-success software sits in a particularly intimate position. It sees which users log in, what they adopt, what they ignore and whether the relationship looks secure. The same visibility that permits useful intervention can become surveillance without discipline. Trust is therefore not a compliance appendix to the product. It is part of the product's architecture.
That architecture had to grow. In March 2021, ChurnZero raised a $25 million Series B led by JMI Equity, with Baird Capital and Grotech Ventures returning. The company said the round brought total funding to $35 million and would support hiring, ecosystem development, go-to-market work and deeper product development. Funding is not achievement in itself; it is stored expectation. For a CTO, it also turns into databases, integrations, security reviews, release calendars and a larger number of ways for Tuesday to become interesting.
Definitive Ideas recorded transactions. Vocus organized communications. ChurnZero organizes the relationship after a sale. The business problem changes; the technical instinct remains: collect a meaningful signal and put it where someone can use it.
A founder who stayed in the engine room
Heys remains ChurnZero's chief technical officer and sits on its board. He has not turned the founder title into a touring identity. His public footprint is comparatively spare: a leadership biography, a small number of LinkedIn posts, filings, a patent and the occasional quotation about security. The restraint suits the work. Infrastructure is noticed most when it fails, rather like plumbing but with more acronyms.
It would be easy to tell the ChurnZero story as a triumph of prediction. That would miss the human decision embedded inside the software. A health score does not retain a customer. A person or a well-designed workflow uses it to ask a better question at a better moment. The platform's job is to shorten the distance between faint evidence and useful attention.
The company now describes itself as a customer-growth platform and has moved into AI agents, automated journeys, forecasting and relationship intelligence. The vocabulary is contemporary. The original problem remains stubbornly ordinary: people cannot respond to what they cannot see. The modern system may summarize a meeting, detect risk in free text or recommend a next step, but its worth is still measured by the quality of the action that follows.
There is a tidy symmetry in Heys's path. Early in his career, he helped software understand the moment money changed hands. Later, he helped a SaaS company understand the communications surrounding a business. At ChurnZero, the focus shifted to everything after the contract is signed, when the promises of a sale meet the habits of actual use.
That is where customer relationships are usually won or quietly misplaced. Not at the dramatic exit, but in the accumulated minor signals beforehand. Heys built his second company around those signals. The result is an instrument panel for a part of business that once relied heavily on rear-view mirrors.
The value of staying with the problem
Technology careers are often narrated as a sequence of leaps: new language, new company, new market, repeat. Heys's record suggests a different rhythm. He has made two long institutional commitments, first at Vocus and then at ChurnZero, with a short OutMarket chapter connecting them. Staying does not guarantee wisdom, of course. It does provide the chance to see consequences arrive. An architecture that looked tidy in year one meets migrations, acquisitions, new regulations, impatient customers and the colleague who quite reasonably clicks the button twice.
That duration matters in customer success because the subject itself is duration. A sale is an event; retention is a pattern. The software has to remember the early promise, notice the daily behavior and keep enough context to make a renewal conversation honest. Heys has built the company in much the same manner that its product reads a customer relationship: over time, with attention to small changes rather than a single dramatic snapshot.
It also explains why the founding story still carries weight after a decade. The first manual trawl through customer data was not glamorous, yet it forced the founders close to the problem. They saw both the evidence and the people trying to use it. Every layer added since - health scores, journeys, forecasts, automated playbooks and AI agents - answers some version of that original inconvenience. The technology can become elaborate. The test remains pleasantly severe: did it help somebody notice what mattered soon enough to be useful?