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Liam Brennan

Operator

Liam Brennan is Managing Director of The Responsible Marketing Agency, which helps brands, agencies and publishers meet environmental, social and governance goals. He has nearly two decades in media and marketing, joining from WPP's EssenceMediacom — where he launched and led the Blink Consulting digital-transformation practice — and earlier held senior roles at MediaCom, Publicis's Starcom and Dentsu's Carat. He judges the World Media Group awards and contributes to Ad Age.

Last updated Jun 29, 2026 by the ATDb Editorial Team

Role
Managing Director
Company
The Responsible Marketing Agency
Based
San Francisco, California, United States
Connections
1
Years in industry
15 years

Bio

Liam Brennan is Managing Director of The Responsible Marketing Agency, which helps brands, agencies and publishers meet environmental, social and governance goals. He has nearly two decades in media and marketing, joining from WPP's EssenceMediacom — where he launched and led the Blink Consulting digital-transformation practice — and earlier held senior roles at MediaCom, Publicis's Starcom and Dentsu's Carat. He judges the World Media Group awards and contributes to Ad Age.

Career

  • Senior Vice President

    LiveRamp

  • Senior Leadership Role

    MediaLink

Expertise & education

Expertise

Identity ResolutionRampIDAuthenticated Traffic Solution (ATS)Data Clean RoomsProgrammatic AdvertisingData CollaborationPrivacy-Safe AdvertisingCookieless Targeting

Speaking topics

The future of identity in a cookieless worldPrivacy-safe data collaboration and clean roomsInteroperability in the open web ecosystemAddressable advertising without third-party cookies

Recognition

Notable achievements

  • Led commercial and technical scaling of RampID into one of the most widely adopted cookieless identity solutions across the open web
  • Oversaw LiveRamp's Authenticated Traffic Solution (ATS) adoption across hundreds of major publishers globally
  • Positioned LiveRamp as central infrastructure for data clean room interoperability across brands, agencies, and platforms
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