Havas Media Network North America Elevates Investment Leadership with Industry Powerhouse Jon Stimmel

With a strategic focus on driving innovation, enhancing investment solutions, and accelerating business growth, the new appointment at Havas Media Network reinforces the company’s continued focus on excellence and marketplace impact, driving better ROI for clients.

Havas Media Network today announced the appointment of Jon Stimmel as Chief Investment Officer for North America. Based in New York, Jon Stimmel will report directly to North America CEO, Greg James, and join the North American Leadership Team. In addition, Mike Bregman has been named Chief Data and Product Officer for North America. These appointments come as the agency continues its strong momentum and investment to deliver best-in-market solutions for clients across the market.

In this role, Stimmel will be instrumental in advancing Havas’ converged strategy, linking data to activation, while identifying emerging marketplace opportunities. Stimmel will lead the agency’s marketplace strategy and investment approach, focusing on developing innovative solutions that create meaningful brand experiences across media, creativity, and technology. His appointment reinforces Havas Media Network commitment to delivering innovative, value-drive solutions for clients in an increasingly complex media landscape.

Jon’s appointment marks a pivotal moment for Havas Media Network as we continue to scale the power of Havas Converged—our integrated approach that seamlessly connects media, creativity, production, data, and technology to drive smarter, more effective investment strategies. His deep expertise across client, agency, and ad tech ecosystems—combined with a sharp understanding of how data and activation intersect—reinforces our ability to create marketplace solutions that are not just efficient, but transformational. Jon’s leadership will be instrumental in strengthening our investment strategy, deepening our marketplace influence, and ensuring we continue delivering innovative, client-centric solutions that maximize impact in an ever-evolving media landscape.

Greg James

CEO, Havas Media Network North America

Prior to joining Havas Media Network, Stimmel served as Chief Growth Officer at Sabio Holdings, Inc., where he successfully oversaw strategic marketing and drove adoption of the company’s demand-side platform. His extensive experience includes serving as Chief Investment Officer at UM Worldwide, where he led cross-channel buying strategy and created foundational partnerships for IPG Mediabrands. Stimmel also held key leadership positions at Publicis Starcom and spent seven years at Unilever, where he developed comprehensive investment strategies from a client perspective.

I am thrilled to join Havas Media Network at this pivotal time in our industry. The media landscape is undergoing unprecedented transformation, creating unique opportunities to reshape how we deliver value to clients. Havas Media Network's commitment to innovation and its Global converged strategy perfectly aligns with my vision for the future of media investment. I look forward to working with the talented team here to drive transformative solutions that help our clients thrive in this dynamic environment.

Jon Stimmel

Chief Investment Officer, Havas Media Network North America

As Havas Media Network continues to expand in the market, the seamless integration of investment and data capabilities unlocks powerful opportunities for clients, allowing them to forge deeper, more meaningful connections between brands and audiences through data-driven investment strategies.

Stimmel begins his new role immediately.