Built by operators.
For operators.
No theory. Just real experience.
We're the community and operating platform for startup marketers and founders — the place that gives you real answers and real resources, from a group of practitioners scaling their own businesses.
You are not alone.
Startup marketing is a discipline, not a tactic
Enterprise teams have agencies and unlimited runway. You have Tuesday afternoon and a gut feeling.
That's not a channel or a checklist — it's small teams, real constraints, and decisions that cost runway when they're wrong.
And it's not just for startups. Standing up a new function inside a big company? Same job, different org chart.
That's what SUM is built for — practitioners sharing real answers and honest peer support.
What We Do
We provide the essential toolkits, frameworks, and resources startups need to grow from seed stage through scale — knowledge crowdsourced from founders and operators who've been exactly where you are, curated through years of B2B marketing expertise.
For Founders
More than a community
4,000+ members across B2B and B2C technology businesses share the challenges, the game-changers, and the trends shaping the market in real time. That's pattern recognition you can't buy.
What's actually working at your stage — and what's a distraction
What breaks at 10x scale, from people who hit it
Marketing muscle matched to each iteration of your business plan
For StartUp Marketers
The peer group you needed
You're probably the first department hire, or the first specialist in your domain. No enterprise org to lean on, no pre-built plan, and no one to do the work for you.
A room full of people in your shoes — ask what you can't ask your CEO
Frameworks built for small teams building the plane while flying it
Air cover: benchmarks and proof the approach worked somewhere first
Expertise that backs you up when founders are hiring
The operators behind SUM
The people who write the frameworks, run the sessions, and answer in the lounge.
Mack McKelvey
CEO & Founder
Beth Pyne
Senior VP, Marketing
The Kay Prince
Head of Growth
Kate Scanlan
Senior Director, Content
Dana Bistany
Director, Partnerships
Bella Locke
PR Manager
Anthony Meaders
PR Associate
Diksha Sabharwal
Senior Manager, Digital
How We Operate
Practitioners only
Everything here comes from someone who has actually run it, spent the budget, and lived with the result.
Free stays free
The Lounge, the library and the basic templates never go behind a paywall. Always built for startups.
Shortlists, not directories
We'd rather point you at three vetted options than list two hundred and call it choice.
Honest about what failed
The teardowns include the campaigns that did not work. That is usually where the lesson is.
Want to write, speak, or partner with us?
We're always looking for operators with a point of view — for the newsletter, content, and the live sessions.