# Mercury Public Affairs, LLC

> Mercury Public Affairs is a New York-founded, Omnicom-owned public strategy consultancy that combines government relations, communications, research, digital influence, crisis work, and grassroots organizing. Founded by Republican strategist Kieran Mahoney in 1999, it now describes a bipartisan network of about 130 experts, 15 offices, and 550 clients globally, serving corporations, advocacy groups, governments, political parties, NGOs, and public figures.

- **Founded:** 1999
- **Headquarters:** New York, United States
- **Founders:** Kieran Mahoney (Founder and Executive Chairman)
- **Products:** Government Relations, Strategic Communications, Crisis Management, Digital, Grassroots Coalition Building
- **Notable:** Expanded from a New York boutique founded in 1999 to 15 offices., Reports approximately 130 experts and 550 clients globally., Built a bipartisan grassroots mobilization network covering all 50 U.S. states.

## Products & services

- **Government Relations** — Federal, state, and local advocacy supported by communications, polling, grassroots mobilization, and state lobbying.
- **Strategic Communications** — Message development, media relations, reputation work, and communications strategy for complex public issues.
- **Crisis Management** — Rapid counsel and communications for corporate reputation, litigation, and other high-stakes events.
- **Digital** — Digital influence, advocacy, content, targeting, and online campaign execution.
- **Grassroots Coalition Building** — Mobilization and coalition programs, supported by a bipartisan network operating across all 50 states.
- **Public Opinion Research** — Polling and audience research used to test sentiment, messages, and campaign choices.
- **International Affairs** — Public affairs and policy counsel for governments and international organizations operating in the United States and abroad.
- **Political Consulting** — Campaign strategy, messaging, research, and execution informed by operatives from both major U.S. parties.
- **Think Tank and NGO Engagement** — Strategies for engaging policy institutions and civil society to build credibility, address reputational issues, and shape policy discussion.
- **Hispanic Communications** — Culturally informed communications and engagement for Hispanic audiences.
- **Public Affairs Campaign Management** — Integrated management of multi-channel advocacy and influence campaigns.

## Achievements

- Expanded from a New York boutique founded in 1999 to 15 offices.
- Reports approximately 130 experts and 550 clients globally.
- Built a bipartisan grassroots mobilization network covering all 50 U.S. states.
- Merged Serafin & Associates into its Illinois business in 2024.
- Installed longtime Mercury executive John Gallagher as chief executive officer in 2026.

## Latest updates

- **2026-08** — Added nonprofit expert Crystal Justice to the Illinois public affairs team.
- **2026-06** — Added a Democratic political strategist to the Illinois team.
- **2026-04** — Expanded the Illinois office with Maureen Jasculca as managing director and welcomed Dan Boyle as senior vice president.
- **2026-01** — Named Brian Hughes partner to lead the Tallahassee office and hired former White House aide Brette Powell.
- **2025-09** — Opened a San Francisco office led by Marjan Philhour and promoted Danielle Alvarez to partner.
- **2024-11** — Merged Chicago-based Serafin & Associates into Mercury's Illinois business.

## Links

- Website: https://www.mercuryllc.com
- LinkedIn: https://www.linkedin.com/company/mercuryllc
- Facebook: https://facebook.com/pages/Mercury-Public-Affairs/107335709300769?sk=info

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Profile page: https://yespress.io/mercury-public-affairs-llc
Published by YesPress — https://yespress.io
Last updated: 2026-09-24