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I'm an innovation-obsessed performance marketing leader who thrives on building data-driven, direct-response teams across B2B, eCommerce, Travel and Finance. I love turning complex data into actionable insights, guiding decisions from planning to activation, and delivering double-digit revenue growth year after year. Leading an 80-person EMEA performance hub from Dublin, I partner with clients and cross-functional teams to optimize paid search, paid social, YouTube, SEO and programmatic channels at scale. I'm a people-focused leader with strong emotional intelligence who develops talent from apprentices to C-level executives. I champion remote and hybrid work, successfully managing a large distributed team since 2020, and I enjoy mentoring teams to adopt data-informed approaches that improve efficiency and outcomes. In my spare time I enjoy sports tech, music, and travel.…I'm an innovation-obsessed performance marketing leader who thrives on building data-driven, direct-response teams across B2B, eCommerce, Travel and Finance. I love turning complex data into actionable insights, guiding decisions from planning to activation, and delivering double-digit revenue growth year after year. Leading an 80-person EMEA performance hub from Dublin, I partner with clients and cross-functional teams to optimize paid search, paid social, YouTube, SEO and programmatic channels at scale. I'm a people-focused leader with strong emotional intelligence who develops talent from apprentices to C-level executives. I champion remote and hybrid work, successfully managing a large distributed team since 2020, and I enjoy mentoring teams to adopt data-informed approaches that improve efficiency and outcomes. In my spare time I enjoy sports tech, music, and travel.

David O Riordan

Performance Marketer, Digital Marketer, Marketing Strategist, +2

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I'm an innovation-obsessed performance marketing leader who thrives on building data-driven, direct-response teams across B2B, eCommerce, Travel and Finance. I love turning complex data into actionable insights, guiding decisions from planning to activation, and delivering double-digit revenue growth year after year. Leading an 80-person EMEA performance hub from Dublin, I partner with clients and cross-functional teams to optimize paid search, paid social, YouTube, SEO and programmatic channels at scale. I'm a people-focused leader with strong emotional intelligence who develops talent from apprentices to C-level executives. I champion remote and hybrid work, successfully managing a large distributed team since 2020, and I enjoy mentoring teams to adopt data-informed approaches that improve efficiency and outcomes. In my spare time I enjoy sports tech, music, and travel.…I'm an innovation-obsessed performance marketing leader who thrives on building data-driven, direct-response teams across B2B, eCommerce, Travel and Finance. I love turning complex data into actionable insights, guiding decisions from planning to activation, and delivering double-digit revenue growth year after year. Leading an 80-person EMEA performance hub from Dublin, I partner with clients and cross-functional teams to optimize paid search, paid social, YouTube, SEO and programmatic channels at scale. I'm a people-focused leader with strong emotional intelligence who develops talent from apprentices to C-level executives. I champion remote and hybrid work, successfully managing a large distributed team since 2020, and I enjoy mentoring teams to adopt data-informed approaches that improve efficiency and outcomes. In my spare time I enjoy sports tech, music, and travel.

Available to hire

I’m an innovation-obsessed performance marketing leader who thrives on building data-driven, direct-response teams across B2B, eCommerce, Travel and Finance. I love turning complex data into actionable insights, guiding decisions from planning to activation, and delivering double-digit revenue growth year after year. Leading an 80-person EMEA performance hub from Dublin, I partner with clients and cross-functional teams to optimize paid search, paid social, YouTube, SEO and programmatic channels at scale.

I’m a people-focused leader with strong emotional intelligence who develops talent from apprentices to C-level executives. I champion remote and hybrid work, successfully managing a large distributed team since 2020, and I enjoy mentoring teams to adopt data-informed approaches that improve efficiency and outcomes. In my spare time I enjoy sports tech, music, and travel.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Spanish; Castilian

Advanced

Work Experience

Chief Performance Officer at Dentsu

December 1, 2021 - Present

Responsible for an 80-person EMEA performance team hub based in the Dublin office, with expertise across Paid Search, Paid Social (Meta, TikTok, Snap, Reddit), YouTube, BVOD, SEO, Programmatic, and Martech. Managed B2B clients including LinkedIn (EMEA), Sage (EMEA) and Stericycle (Global). Launched and led a Data, Analytics and Martech team delivering MMM, consent & compliance and strategic guidance on data warehousing and pipelines to brands, driving data-informed decisions across the funnel. Client highlights include launching the Facebook Workplace product in 3 markets on PPC, scaling to 7m users across 100+ markets using Search, Social and Programmatic, and increasing MQLs +13% YoY and SAOs +19% YoY through data-driven experimentation and targeting refinement.

Head of Paid Search at Prospect

December 1, 2021 - September 12, 2025

Repositioned the team from a satellite Irish office to a global B2B hub, delivering 3.5x revenue YoY. Automated processes and outsourced tasks to cheaper cost centres, improving team cost/income ratio by 23%. Collaborated with a 3rd party data company to refine white-label customer match segmentation and created a roadmap-based training programme for new starters, plus SOPs to standardise processes. Built UK-led workstreams to deepen expertise in Audience, Platform, Automation and Shopping, and helped create a centralised training video hub with global knowledge sharing.

Bidable Account Director at Prospect

August 1, 2017 - September 12, 2025

Promoted from AM to Paid Search Account Director, leading campaigns across 16 markets in 10 languages. Managed eight direct reports (three remote). Brought Diageo, Kellogg’s and Mondelez into the E‑Commerce era via Amazon and Criteo marketing activity, with Criteo delivering 1400% ROI and Amazon up to 2700% ROI. Expanded biddable responsibilities to include paid search, paid social, YouTube and app marketing; piloted a 6x up-weighted media budget in paid search for IKEA, achieving ROAS targets with Google’s test and measurement team.

Paid Search Account Manager at Prospect

June 1, 2015 - September 12, 2025

Promoted to a Biddable AM role after 15 months, primarily covering insurance and gambling clients.

Paid Search Account Executive at Prospect

April 1, 2014 - September 12, 2025

Managed million-plus keyword accounts and delivered ROI of 1400% - 1700% on a regular basis for a B2B eCommerce client.

Chief Performance Officer at Dentsu

December 1, 2021 - Present

Responsible for Dentsu's 80-person EMEA performance team hub based out of the Dublin office. Leads across Paid Search, Paid Social (Meta, TikTok, Snap, Reddit), YouTube, BVOD, SEO, Programmatic and Martech. Manages key B2B clients including LinkedIn (EMEA), Sage (EMEA) and Stericycle (Global); previously supported Workplace by Facebook, Workday and Kaspersky. Established a Data, Analytics and Martech function to offer data‑driven guidance on data warehousing, pipelines, consent and compliance, driving decisions across the marketing funnel. Highlights include launching the Facebook Workplace product in 3 markets and scaling to 7 million users across 100+ markets, and delivering data-driven funnel optimization that increased MQLs by 13% YoY and SAOs by 19% YoY through offline data integration and close sales collaboration.

Head of Paid Search at Prospect

December 1, 2021 - September 12, 2025

Repositioned Prospect's Irish satellite office into a global B2B hub, delivering 3.5x revenue YoY. Automated processes and outsourced non-core tasks to reduce cost-to-income ratio by 23%. Collaborated with a 3rd-party data partner to refine white‑label customer match segmentation. Implemented a roadmap-based training programme for new starters to build responsibility and ownership, later rolled out across departments. Established centralised training video hub with global iProspect specialists to boost knowledge sharing and reduce duplication, enabling the Irish team to develop deep expertise in Audience, Platform, Automation and Shopping workstreams.

Bidable Account Director at iProspect

August 1, 2017 - September 12, 2025

Promoted from AM after 1 year to lead paid search, paid social, YouTube and app marketing campaigns across 16 markets in 10 languages with eight direct reports (three remote). Brought Diageo, Kellogg’s and Mondelez into the E‑Commerce era via Amazon and Criteo marketing; Criteo activity delivered ~1400% ROI and Amazon up to ~2700% ROI. Expanded role to include multiple biddable channels for Auto Trader and IKEA/Saga Insurance; achieved a 6x upward budget test in paid search and hit ROAS targets in collaboration with Google test & measurement team.

Paid Search Account Manager at iProspect

June 1, 2015 - September 12, 2025

Promoted to Biddable AM, managing multi-million keyword accounts and delivering ROI in the 1,400–1,700% range for a B2B eCommerce client.

Paid Search Account Executive at iProspect

April 1, 2014 - September 12, 2025

Managed million-plus keyword accounts, delivering ROI in the 1,400–1,700% range for a B2B eCommerce client.