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Ronan Shields

Senior Programmatic Reporter at Digiday

Investigative reporting on programmatic advertising's opacity, ad fraud, and supply chain inefficiencies

Thought LeaderLinkedInNew York, New York, United States12+ years in industry

Last updated May 31, 2026 by the ATDb Editorial Team

Bio

Ronan Shields is a Senior Programmatic Reporter at Digiday, where he covers the mechanics and systemic challenges of programmatic advertising, including ad fraud, supply path optimization, and Made-For-Advertising sites. He previously served as a Reporter and Staff Writer at Digiday from 2019 to 2022, and before that covered programmatic and digital advertising at Adweek from 2016 to 2019.

Previous Roles

Programmatic Reporter

Adweek (2016-2019)

Reporter / Staff Writer

Digiday (2019-2022)

Expertise
Programmatic AdvertisingAd FraudSupply Chain TransparencyMade-For-Advertising (MFA) SitesSupply Path Optimization (SPO)Header BiddingAdTech Investigative JournalismDigital Advertising Ecosystem
Notable Achievements
  • Broke multiple industry-defining investigations into MFA site economics and their impact on advertiser spend
  • Reporting on programmatic supply chain opacity has been cited by industry bodies including ANA and IAB
  • Established Digiday as a leading destination for programmatic accountability journalism
  • Developed one of the most extensive source networks in AdTech journalism spanning DSPs, SSPs, agencies, and independent researchers
Speaking Topics
Ad Fraud and Supply Chain IntegrityMade-For-Advertising Sites and ArbitrageProgrammatic TransparencySupply Path Optimization
Publications
  • Digiday
  • Adweek