# Dena Cook

> Dena Cook is co-founder and CEO of Signal, a strategic communications firm established in 2023. Based in Santa Monica, she previously led Brew, oversaw its acquisition by Freud Communications, and headed global communications and public relations at Mattel. Her career also includes Reinvent Capital and Age of Learning, alongside board leadership at the Alliance for Children’s Rights.

- **Role:** Co-founder and CEO at Signal
- **Organizations:** Signal, Brew, Mattel, Reinvent Capital, Age of Learning, Zeno Group, Fleishman-Hillard, Alliance for Children’s Rights
- **Education:** Bachelor’s degree in International Relations and Affairs, University of California, Davis
- **Known for:** Led Brew as CEO and oversaw its 2016 acquisition by Freud Communications., Appointed to Mattel’s global communications leadership in 2019., Mattel’s appointment release records her as number one on Business Insider’s 2017 list of 51 best PR People in Tech.

## Career timeline

- **Before Brew** — Managed client accounts at Fleishman-Hillard and served as senior vice president at Zeno Group.
- **2011** — Documented as Brew founder Brooke Hammerling’s Los Angeles-based business partner.
- **2016** — As Brew CEO, oversaw the agency’s acquisition by Freud Communications; trade reporting valued the transaction at $15 million.
- **2017** — Joined the Alliance for Children’s Rights board; Mattel’s later appointment announcement records her number-one placement on Business Insider’s 51 best PR People in Tech list that year.
- **2019** — Appointed executive vice president and global head of communications and public relations at Mattel on March 6, reporting to Ynon Kreiz.
- **2020** — Joined Reinvent Capital; a subsequent company biography identifies her role as partner and chief communications officer.
- **2021** — Publicly documented working with Age of Learning colleagues during an office visit in November.
- **2021-2022** — Listed as board co-chair of the Alliance for Children’s Rights in its impact report.
- **2023** — Co-founded Signal; its California entity was established on February 23.

## Achievements

- Led Brew as CEO and oversaw its 2016 acquisition by Freud Communications.
- Appointed to Mattel’s global communications leadership in 2019.
- Mattel’s appointment release records her as number one on Business Insider’s 2017 list of 51 best PR People in Tech.
- Included in the Influence 100 in 2019 and 2020.
- Served as board co-chair of the Alliance for Children’s Rights, documented in its 2021-22 impact report.
- Co-founded Signal in 2023.

## Latest updates

- **2026-09** — Turing’s September 9 announcement of its new chief information security officer lists Signal’s media-relations address, documenting recent work by Cook’s firm.
- **2025-09** — Listed as media contact for Nova Sky Stories’ September 23 board announcement, which followed its $50 million Series B round.

## Links

- Website: https://www.signalgroup.co/
- LinkedIn: https://www.linkedin.com/in/denacook
- Twitter/X: https://x.com/DenaCook

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Profile page: https://yespress.io/dena-cook
Published by YesPress — https://yespress.io
Last updated: 2026-10-22