Business & Strategy
Section 1
Core Idea
Customer personas are archetypal descriptions of who you're selling to — a named, concrete profile (e.g. "Marketing Mary," "IT Ian") that captures goals, pain points, context, and behavior. Done well, they align product, marketing, and sales around a shared picture of the customer; done poorly, they're generic fiction that doesn't change decisions. In building and scaling, personas are useful when they're grounded in research and tied to segments and journey stages, and when they drive what you build and how you message. The test is simple: does "would Marketing Mary care?" or "is this for the economic buyer or the end user?" change a real decision? If not, the persona is wallpaper. Keep the set small (2–4) and refresh from interviews and data so they don't drift into fantasy.
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Section 2
How to See It
Product
You're seeing Customer Personas when roadmap and feature prioritisation reference specific personas ("this is for the operator who…") and there's a clear link from persona need to requirement.
Marketing
You're seeing Customer Personas when messaging and creative are written for a named persona — tone, channels, and value props differ by persona — and performance is tracked by segment that maps to personas.
Sales
You're seeing Customer Personas when discovery and pitch are tailored to "who we're talking to" (economic buyer vs user vs champion) and win/loss is analysed by persona fit.
Section 3
How to Use It
Build personas from real data: interviews, usage, win/loss. Keep the set small (2–4); add detail that affects decisions (goals, objections, where they are in the journey), not demographics for their own sake. Use personas in planning: "Would Marketing Mary care?" "Is this for the economic buyer or the end user?" Refresh when the market or product shifts.
Decision filter
"When we ship or message, are we aiming at a specific persona — and did that persona come from evidence, not guesswork? If we can't name who this is for, we're spraying."
As a founder
Define 2–4 personas from customer and prospect research. Use them in product (who is this for?), marketing (message by persona), and sales (who are we talking to?). Tie personas to segments and journey so they're actionable, not decoration.
Section 5
Founders & Leaders
David OgilvyFounder, Ogilvy & Mather; advertising pioneer
Ogilvy insisted on knowing the consumer: "The consumer isn't a moron; she is your wife." He used research and observation to build a clear picture of who he was talking to — in effect, personas — and tailored copy and creative to that picture. Founders can do the same: one sharp persona beats a dozen vague ones.
Section 7
Connected Models
Reinforces
Segmentation
Segmentation divides the market by meaningful criteria (firmographic, behavioral, need). Personas give segments a face and a story — they're the narrative form of a segment so product and marketing can "talk to" someone concrete.
Tension
Jobs to Be Done
JTBD focuses on the job, not the person. The tension: personas can over-emphasise who and under-emphasise the job. Use both: persona for context and messaging, JTBD for the core value proposition and feature set.
Leads-to
Customer Buying Journey
Personas often sit at a stage in the journey (e.g. problem-aware Mary vs product-aware Mary). The journey defines what message and touchpoint fit; the persona defines who you're addressing. Use them together for targeted messaging.
Section 8
One Key Quote
— David Ogilvy, Confessions of an Advertising Man (1963)"Do your homework. Know your customer. The more you know about who you're talking to, the more sharply you can speak to them — and the more likely they are to respond."
Section 11
Summary & Further Reading
Customer personas are archetypal, research-based profiles of who you're selling to. Use 2–4 personas to align product, marketing, and sales; tie them to segments and journey; and refresh from data. When they drive decisions, they're useful; when they're generic fiction, they're not.
01
Academic / practice
Canonical treatment of building and using personas in product development; research-based approach.
02
Book
Positioning and context; supports connecting personas to positioning and message.
03
Book
JTBD and the job; useful tension with personas — job vs person — for sharper positioning.