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Leo Burnett

Founded in Chicago in 1935, Leo Burnett Worldwide is a wholly-owned subsidiary of Paris-based Publicis Groupe S.A.

+1 312-220-5959

Sep. 01, 2026

Negotiated by Hearts United, the package includes deeper in-show integrations and wider cross-channel activations

Sep. 01, 2026

New agency brings together OM's Hearts & Science and Mediahub to create a new 40-market global network