Mark Duff

Client Growth & Account Strategy | Digital Advertising | Data-Driven Revenue Growth

Spain

About

Account Strategist and Performance Marketing professional with 5+ years of experience helping clients grow revenue through data-driven advertising and strategic account management. Throughout my career, I've managed large advertiser portfolios across EMEA and worked directly with clients to optimise marketing investments, identify growth opportunities, and drive measurable business outcomes. I have hands-on experience across Google Ads, Meta Ads, Microsoft Ads, and Metasearch, managing portfolios of up to 120 accounts and budgets exceeding €300K. Most recently, at Userguest, I managed a portfolio of approximately 40 hotel properties, including multi-property hotel groups, where I was responsible not only for campaign performance but also for client retention, growth, and strategic recommendations. By combining performance data, market insights, and business objectives, I helped clients maximise ROI, uncover new demand opportunities, and make smarter investment decisions. My strength lies in translating complex data into clear business recommendations. I enjoy building trusted client relationships, influencing budget allocation decisions, and identifying opportunities to increase investment where stronger returns can be demonstrated. Having worked extensively across Google, Meta, and Microsoft ecosystems, I'm comfortable helping clients evaluate channel performance and optimise their overall marketing mix. I'm particularly interested in the intersection of advertising technology, commerce media, AI, and growth strategy. I regularly leverage AI tools to accelerate analysis, identify trends, and uncover opportunities that support better decision-making for clients and businesses alike. Fluent in English, French, and Spanish, I bring an international perspective, strong commercial acumen, and the ability to build relationships across clients, sales teams, customer success, and product stakeholders.

Experience

  • Junior Account Strategist at Criteo
    Jul 2026 - Present · 1 mo

  • Paid Media Manager at Userguest
    Jul 2025 - Apr 2026 · 10 mos

  • Google Ads Sales Executive - French Market at Teleperformance
    Sep 2024 - Jun 2025 · 10 mos

    Managing a portfolio of 120 Google Ads client accounts on a quarterly basis for the French Market (Agencies and direct clients) Helped clients increase results on the platform by up to 20% Consistently reached 120% of my target every quarter Ranked in the top 10% performing employees within the cluster

  • Travel at Career Break
    Oct 2023 - Aug 2024 · 11 mos

    Completed a 9-month backpacking trip around several countries in Latin America

  • Teleperformance ()
    • Google Ads Senior Digital Marketing Consultant - French Market (Agencies & Direct Clients)
      Apr 2023 - Oct 2023 · 7 mos

    • Google Ads Senior Digital Marketing Consultant - French Market (Direct Clients)
      May 2022 - Mar 2023 · 11 mos

    • Google Ads Junior Digital Marketing Consultant - French Market
      Nov 2021 - Apr 2022 · 6 mos

      Managed a portfolio of 160 Google Ads direct client accounts Consistently reached 120% of my target every quarter Won a pitch-off competition for the French team