Why Co.Si

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In the last 12 months, the role of a creative agency has changed. Agencies used to work at the edge of the business. Marketing was often treated as a veneer, applied after the important decisions had already been made.

Now creative must sit closer to the center. The right creative idea shapes products, customer experiences, strategic business decisions and the systems that drive tangible growth. Done right, creative isn't a cost center, it is a profit center.

Since day one, nearly 20 years ago, Co.Si was built with business outcomes as our reason for being. We exist to make work that works so well, the business can't imagine living without it.

The new model is part service, part SaaS. Co.Si is embedded in the business, drawing realtime insights from product, sales, customer experiences, and live results with all teams unified in Co.Si Workspace.

That puts us close enough to find what a brief can overlook: the social comment that's being overlooked, a hidden friction point customers keep hitting, an underused moment in a sales conversation, an audience no one had considered, or a different way to bring to life a product story.

  • Years Independent

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  • Matt Seigel

    Matt Seigel is a partner at Co.Si with more than 20 years of experience across advertising, entertainment and technology. Before joining the agency, he founded and led VaynerLA, overseeing VaynerMedia’s West Coast creative, strategy and media practices. His career has focused on social-first marketing, digital innovation and building integrated teams across a range of industries.

  • Jason Simon

    Jason Simon is a co-founder and partner at Co.Si, where he leads client services and creative strategy. A graduate of the USC Marshall School of Business, he began his career at Sapient and later led an interactive agency serving Nestlé brands. He subsequently built the integrated division of IPG’s Dailey with Nick Collier before the two founded Co.Si in 2008.

  • Nick Collier

    Nick Collier is a co-founder and partner at Co.Si, where he leads creative strategy. He began his career at Disney after graduating from NYU’s Tisch School of the Arts, and later built the integrated agency division of IPG alongside Jason Simon. At Co.Si, Nick focuses on high-performance creative work and helps guide AI creative systems.

  • Rachael Guichard

    Rachael Guichard is Managing Director at Co.Si. She joined the agency as a Client Partner in 2012 and became Managing Director in 2017. A graduate of the University of Southern California with a degree in journalism, Rachael began her career in media and entertainment before moving into global brand management in the beauty category. At Co.Si, she leads operations, client partnerships, and the delivery of work across the agency.

  • Dani Perkins

    Dani Perkins is Group Creative Director at Co.Si, where she has led the agency’s creative department for nearly a decade. Dani has worked across creative performance, user experience, CRM design, paid social and complex customer journeys, with an eye for brand-right performance. Prior experience includes Toyota, McDonalds, Bank of America, Kraft Foods, Nescafé, and more. A graduate of ArtCenter College of Design, Dani began her career at RAPP before joining Co.Si, where she oversees creative work across a range of industries.

  • David Tucker

    David Tucker is Head of Creative Technology at Co.Si, where he leads the Creative Systems Studio, the team that turns the agency's creative craft and strategy into the systems, tools, workflows, and AI behind the work. He built Co.Si Workspace, the platform the whole agency now works in. Before Co.Si, he spent 15 years as a creative director and technologist for brands big and small, from startups to Disney, Apple, and Mattel. He holds degrees in both design and computer science.

  • Julien Lormant

    Julien Lormant is Director and Head of Production at Co.Si, where he leads video production from creative development through final delivery. His background spans directing, editing and producing campaigns for brands including Disney, IMAX, Klaviyo, Intuit, Dropbox, Tubi and Snapchat. He works across strategy, storytelling and execution to bring complex productions to market.

  • Rhiannon Reagan

    Rhiannon Reagan is Director of Partnerships at Co.Si, where she leads new business development and partnerships while staying closely involved in client strategy and account leadership. With a background spanning media, account leadership, and integrated marketing, she's worked with brands including P&G, Pinterest, Snapchat, Tubi, Chime, Lovable, and Klaviyo.