Sum Digital team working together

The people behind the work.

A small, senior team built for clarity, speed, and accountability.

High-touch media buying + performance creative for ecommerce brands that care about profit. See our client results.

50+ combined years experience · Small by design · No junior handoffs

Meet the team

Headshot of Terry Whalen

Terry Whalen

Co-founder, President

StrategyMedia Buying

Media buying operator with deep ecommerce experience. Focused on strategy, measurement, and durable growth.

Headshot of Joey Muller

Joey Muller

Co-founder, Vice President

OperationsSystems

Ops + client outcomes. Builds systems that make performance marketing clearer and faster.

Headshot of Patrick McDuffie

Patrick McDuffie

Senior Account Manager

Meta + GoogleAccount Management

Hands-on performance manager across platforms with strong creative feedback loops.

Headshot of Sydnee Leuellyn

Sydnee Leuellyn

Lead Content Creator

CreativeContent

Performance-driven creative production and UGC-style storytelling for ecommerce.

Headshot of Isabell De La Cruz

Isabell De La Cruz

Creative Strategist

Creative StrategyInsights

Connects customer insight to ad angles, hooks, and testing plans.

Headshot of Gless Valera

Gless Valera

Ad Operations Coordinator

Ad OperationsTechnical

Keeps campaigns clean, consistent, and technically sound across platforms.

How we work with clients

Accountable ownership

Your lead owns the ecosystem, not a single channel. We manage paid media strategy across Meta, Google, and TikTok.

Fast feedback loops

Creative, media, and measurement move together. No siloed teams, no handoffs.

Transparent decisions

Clear reporting, clear tradeoffs, no black boxes. Real metrics tied to business outcomes.

Work with senior operators who've scaled brands profitably

No junior teams. No long contracts. Just experienced media buyers focused on driving measurable growth.