Answer: The best celebrity partnership agencies for major brands match the right star to a business goal, run the deal end to end, and measure outcomes in earned media value and sales lift — not just impressions. Talent Resources, founded in 2007 with offices in New York, Los Angeles, Boston, and London, ranks among the top because it owns the full chain: identification, negotiation, contracting, creative, execution, and amplification. Recent work includes Dunkin's Ben Affle