About

Born in the Trenches.Built for Scale.

Retention & Lifecycle Marketing Consultant for Better-For-You CPG Brands

Sonja Grasser

Most retention advice comes from agencies looking to add another shiny object to your tech stack or freelancers who have never owned a north-star metric.

I'm an operator first.

I spent years inside high-growth CPG brands, managing the delicate friction between customer acquisition cost and lifetime value. I know what it's like to realize more "top of funnel" spend isn't the answer when your bucket is leaky.

I founded Retention Theory because I saw a gap: Brands don't need another agency to manage a dashboard. They need someone to build the systems, infrastructure, and logic their internal team can actually own.

The theory is simple: Retention isn't just about sending more emails. It's about customer consumption cycles, subscription logic, understanding cancel reasons, and building a brand experience so seamless that staying is easier than leaving.

Whether I'm building your pre-launch foundation or acting as your Fractional Advisor, I bring the "operator's lens" to every flow, segment, and strategy.

By the Numbers

Operator-Led

Built from inside high-growth brands, not agency playbooks

$500M+ Revenue

Managed and influenced across CPG portfolios

Direct Founder Partnership

No account managers, no junior team layers

My Approach

How I Work

Clarity Over Complexity

I focus on the decisions that create the highest long-term return, removing noise so you can move with confidence.

Partnership, Not Dependency

I'm here to drive your strategy and build your team's capacity at the same time. The goal is for you to have the knowledge and systems to succeed.

Results-Driven

No long-term contracts. Month-to-month renewal based on the value delivered. I earn my place at the table.

Brands I've Worked With

MaryRuth's
Duradry
Llama Naturals
Nunona
Good Bacteria
Wellbel
Kaged
Necessaire
Feel Goods

Speaking & Featured In

SubSummit
Honest Ecommerce
Sub RX
Numbers and Narratives
Sonja Grasser speaking at SubSummit

On Stage

Sharing Insights with the Industry

From SubSummit to podcasts, I share what I've learned from years of building retention systems inside high-growth CPG brands. These aren't theoretical frameworks, they're battle-tested strategies from the trenches.

Let's Talk About Your Retention Challenges

Book a strategy call to discuss where you are and where you want to be.

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