Who are we?

About Sum Digital

Since 2005, our agency has been deeply rooted in SEM and direct-response advertising. In other words, we’re “numbers folks.” We excel at:

  • Digital strategy & defining KPIs
  • Conversion tracking & implementation
  • Campaign execution
  • Creative execution & rigorous A/B testing
  • Measurement & reporting

We have driven revenue and customer acquisition for clients such as Lyft, Microsoft, oDesk, Little Passports, and many others.

With over $5MM in Facebook spend and $20MM in AdWords spend under management, our team of analysts and designers are committed to the highest degree of testing, analysis, and performance.

The Blogging Team

Terry Whalen, President



In 1998 Terry became the CEO of Epitonic, a 30-person online music company based in San Francisco, which featured free MP3 downloads, and full album streams—way before Spotify. Epitonic was backed with $3.5 million from CNET and angel investors, and was sold in 2001 to Palm Entertainment. Hanging up his rock star vests, Terry moved to market GoToMyPC software via PPC and other online marketing channels. It soon led to a $225 million acquisition of GoToMyPC by Citrix Systems in 2003.

Next Terry founded Sum Digital (formerly CPC Search) in 2005. He grew it from experts in PPC Search to a full service digital marketing partner.

Throughout his marketing career, Terry has played a lot of ping-pong and managed search & other online marketing channels that have generated millions of dollars in revenue for his clients.

Terry received his MBA from UC Berkeley’s Haas School of Business, and his BA from UC Berkeley in Political Economics. He is certified in Google Search advertising. When not sneaking into SXSW Keynote addresses he can be found speeding through the desert—music blasting.


Joey Muller, Vice President

Joey Muller, Vice President



Joey, the jack-of-all-trades, started his career in the digital trenches. He troubleshot IT problems for 2 years, built websites for 5 years, and eventually became the golden eagle of digital marketing. In 2009 he started his online marketing career at HD Publishing Group. He then went to market denim for INDI as the Director of Online Marketing. Here he honed his holistic marketing approach by overseeing all channels of marketing, including PPC, SEO, email, social, and affiliate.

In 2011, Joey joined Sum Digital, where he is now a Partner and expert in all things digital marketing for clients like: Microsoft, Lyft, 4WheelParts and more.

Joey received his BA from Dartmouth College in Cognitive Psychology. He is certified in Google Search advertising and Google Analytics. When not sharing the stage with Willie Nelson, The Doobie Brothers, Darren Hayes, Gin Blossoms and others, he can be found on a perch contemplating digital marketing dominance.