Dena Cook is a business builder, a global communications leader, and a strategic storyteller. She co‑founded Signal Group to help companies build their brands and transform their businesses by reaching stakeholders with tailored messages. She previously was the EVP and Global Head of PR at Mattel, the Chief Communications Officer at Age of Learning, and spent 14 years as CEO of Brew Media Relations, a global corporate communications firm. Dena was twice‑named to The Holmes Report’s “Influence 100” of the most influential in‑house communications executives and Business Insider has ranked her #1 on its annual list of the “51 Best PR People in Tech”.

Rebecca Hahn is a transformational, pacesetting communications strategist and operator. She co‑founded Signal Group to help entrepreneurs and visionaries change, shape and amplify brand narratives as they look to scale existing markets, enter new ones and navigate crises. Rebecca is the Chief Communications Officer for Tools for Humanity and previously was the VP of Global Communications at Twitter/X, the Chief Communications Officer at Bird, and a partner at The OutCast Agency. Her experience spans hyper‑growth market disruptors and category creators and leaders across multiple geographies and tech sectors, including online marketplaces, clean energy, social media, ecommerce, venture capital, enterprise software, and Web3/blockchain.