ROAST Strengthens Data Leadership with Appointment of Gauthier Rochas

As Head of Data and Measurement, Gauthier will spearhead innovation in analytics and incrementality testing, ensuring ROAST’s clients can confidently measure, interpret and act on their media performance.

Gauthier joins from RAPP (Omnicom), where he held the role of Data Analytics Director.

Reporting to managing partner, John Barham, Gauthier will lead ROAST’s Data, Analytics and Measurement division, tasked with developing new frameworks to demonstrate the incremental value of the agency’s work and strengthen trust in media performance through transparency and insight.

Gauthier brings a unique mix of scientific training and marketing expertise to the role. Starting his career as a biochemistry engineer, he went on to data, analytics and marketing roles at Procter & Gamble, British American Tobacco and Lloyd’s Register, where he specialised in evaluating the impact of marketing activity on business performance.

Following this, Gauthier moved agency-side, taking senior roles at Essence (WPP), M&C Saatchi Performance, and RAPP (Omnicom). Across these positions, Gauthier deepened his expertise in media measurement, incrementality testing and marketing mix modelling.

“In today’s media landscape, clients expect more than performance – they expect proof,” said Gauthier. “My focus will be on ensuring ROAST not only delivers results but clearly demonstrates the incremental impact our strategy has on clients’ objectives and the business value those results create. It’s about being both analytically rigorous and commercially minded.”

Commenting on the appointment, John Barham said, “Data and measurement have always been at the core of ROAST’s proposition, and Gauthier’s appointment is a key step in taking that to the next level. His combination of technical acumen and commercial understanding will be invaluable as we help clients navigate an increasingly complex media ecosystem.”

As the industry faces challenges such as the deprecation of third-party cookies and a rapidly shifting technology landscape, Gauthier’s role will focus on ensuring ROAST’s clients can confidently measure, interpret, and act on their media performance.

“Measurement isn’t just about reporting and accountability,” Gauthier added. “It’s about empowering clients to make better data-driven decisions, faster. That’s the value we intend to consistently deliver.”