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Garrett O'Reilly

Operator

Garrett O'Reilly is UK CEO of Hearts United, the Omnicom Media agency network formed in August 2026 from Hearts & Science and Mediahub. He had been UK CEO of Hearts & Science since February 2022, after serving as its UK managing director.

Last updated Sep 27, 2026 by the ATDb Editorial Team

Role
UK Chief Executive Officer
Company
Hearts United
Based
New York, New York, United States
Connections
2

AI-drafted from public sources5 sources cited

Years in industry
20 years

Career

Roles with a cited source. All linked roles are in the Roles tab.

Expertise & education

Expertise

Data-Driven Media PlanningProgrammatic AdvertisingAdvanced TV and Connected TVAudience TargetingMedia Agency OperationsAnalytics and MeasurementIntegrated Media StrategyRetail Media

Speaking topics

Data-Driven Media StrategyThe Future of Media AgenciesAdvanced TV and Streaming AdvertisingProgrammatic Advertising at Scale

Recognition

Notable achievements

  • Serving as President of Hearts & Science, one of Omnicom's flagship data-driven media agencies
  • Helping grow Hearts & Science's capabilities in programmatic, advanced TV, and data analytics since the agency's 2016 launch
  • Overseeing media strategy for major clients including AT&T and other Fortune 500 brands
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