Stagwell Media Promotes Lesley Duncan to Managing Partner

Stagwell Media has promoted Lesley Duncan to Managing Partner, marking a new step in her career within the media and advertising industry.

The promotion comes as media agencies navigate changes in audience behavior, digital advertising, and campaign measurement. Brands increasingly expect their agency partners to connect media strategy with business objectives while managing campaigns across a growing mix of digital and traditional channels.

Managing Partner roles typically involve overseeing client relationships, contributing to business strategy, guiding teams, and ensuring that media programs align with client priorities. The position can also require collaboration across planning, analytics, creative, and investment teams to coordinate campaign execution and evaluate performance.

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These responsibilities have become increasingly complex as advertisers work across connected TV, digital video, social media, search, and other channels. Each platform offers different audience signals and measurement approaches, making coordination and consistent performance evaluation important considerations for media organizations.

Data and technology are also reshaping agency operations. Advances in analytics and artificial intelligence are giving media teams new ways to understand audiences, plan campaigns, and assess results. At the same time, advertisers continue to seek greater transparency into where budgets are allocated and how investments contribute to business outcomes.

Senior agency leadership plays a role in balancing these changing requirements with client expectations and team priorities. Managing Partners often help maintain strategic alignment, support long-term partnerships, and guide teams through shifts in the media landscape.