A company calls a public-affairs firm when a normal Tuesday has stopped being normal. A regulator has asked a pointed question. A neighborhood has organized. A reporter has found the document. A bill that nobody expected to move is suddenly moving. The temptation is to call this a communications problem, because communications problems sound containable. Find the right sentence, put the chief executive in a clean room, and wait for the temperature to fall.
Mercury Public Affairs was built around a less comforting proposition: the sentence is only one moving part. The real problem may sit in a committee room, a search result, a union hall, a think tank lunch, or the private opinion of twelve people who have not yet realized they agree. The firm sells the work of finding those parts and making them move in sequence.
That makes Mercury a useful specimen of the modern influence business. Founded in New York in 1999 by Republican pollster and campaign strategist Kieran Mahoney, it has expanded into a bipartisan consultancy with 15 offices, about 130 experts, and, by its own count, 550 clients globally. The clients include corporations, advocacy groups, governments, political parties, NGOs, start-ups, public figures, and institutions. The firm is part of Omnicom, which acquired a controlling interest in 2015.
The product is the handoff
Mercury's menu is long: government relations, strategic communications, crisis management, digital influence, public-opinion research, grassroots coalition building, international affairs, political consulting, Hispanic communications, and engagement with think tanks and NGOs. Read separately, those look like departments. Read together, they describe a relay race.
A pollster discovers that the winning argument is not the argument the client prefers. A communications team translates the discovery into language a skeptical audience might repeat. Government-relations specialists identify the officials with the power to act. Local organizers find credible messengers. Digital teams put the case in front of the right constituency. Then the research begins again, because people have a rude habit of reacting.
The clever message is rarely the scarce thing. The scarce thing is knowing who must hear it, from whom, and before what happens next.The logic behind an integrated public-affairs brief
What fails first in a fragmented campaign is usually the handoff. The lobbyist promises one thing while the ad implies another. The national message lands badly in a state capital. A coalition arrives after the vote instead of before it. Mercury's distinction is less a secret technique than an organizational answer: put the people who know these worlds inside the same plan.
A directory of lived experience
Public-affairs firms often describe people as their product. At Mercury, the phrase is unusually literal. Mahoney came from campaigns and polling. John Gallagher, named CEO in 2026, had been a spokesman for New York City Mayor Michael Bloomberg and led communications connected to the rebuilding of Lower Manhattan after September 11. Other senior staff have served in Congress, state government, presidential campaigns, newsrooms, business, and advocacy.
The résumé is not decoration. It is the database. A former official knows which office owns a decision. A campaign operative knows how an opponent will frame it. A press secretary knows which explanation will produce three worse questions. A local practitioner knows that the mayor and the county executive may share a party but not a Christmas card list.
Bipartisanship, in this model, is not a salon ideal. It is continuity insurance. Elections replace decision-makers, but a company's permit, merger, lawsuit, or reputation problem may endure. A network with experience on both sides can keep reading the room after the room has changed.
List who can approve, delay, legitimize, report on, or mobilize around the outcome.
Separate what the organization wants to say from what persuadable people can actually believe.
The source of a claim often matters more than the polish of the claim.
Private briefings, coalition activity, public communications, and digital distribution should reinforce one another.
Track the decision, the opinion, and the opposition - not merely impressions and mentions.
What does influence cost?
There is no Mercury price list. The business runs on private retainers and project engagements, while government-relations work sometimes surfaces in mandatory lobbying disclosures. A federal filing, for example, may show what one client paid in one quarter. It does not tell you what a crisis program, a state campaign, or an international brief costs, and it certainly does not create a menu.
The bill follows the problem: senior time, markets covered, research required, creative production, paid media, field organization, and duration. Public filings reveal pieces, not the whole engagement.
This is also where the firm's scale becomes its sales pitch. A client can hire separate polling, lobbying, PR, digital, and field shops, then pay in money and time to coordinate them. Mercury offers the bundle. The economic argument is that fewer seams reduce duplicated work and strategic drift. The counterargument is equally plain: an integrated firm concentrates influence and requires the client to trust one adviser with many levers.
Growth by adding local memory
Mercury's expansion is a map of where American decisions get made. Washington matters, but so do Albany, Sacramento, Tallahassee, Austin, Trenton, Harrisburg, Springfield, and city halls from New York to Los Angeles. In November 2024, Chicago-based Serafin & Associates merged into Mercury's Illinois operation, adding more regional communications depth. In 2025, Mercury opened in San Francisco. Hiring continued across Illinois and Florida in 2026.
The local-office model works when the issue genuinely crosses jurisdictions or audiences, when senior advisers collaborate, and when research is allowed to contradict the client. It works poorly when the desired outcome lacks legal or public legitimacy, when leaders want validation instead of diagnosis, or when a small, narrow task is burdened with an elaborate influence machine. No stakeholder map can turn a defective product into a sound one. No bipartisan roster can erase a disclosure filing.
That last point matters because Mercury has represented governments and companies that attract intense scrutiny. Its foreign work appears in Justice Department registrations, and reporting has examined mandates involving Turkey, Qatar, and other contested clients. Mercury ended an agreement with sanctioned Russian bank Sovcombank after Russia's 2022 invasion of Ukraine. In this field, the client list is part of the corporate reputation. The people hired to manage scrutiny live under it too.
The useful lesson is smaller than Mercury
Most organizations do not need 130 experts. They do need the habit that the firm has industrialized: begin with the system, not the artifact. A press release is an artifact. So is an ad, a meeting, a poll, a petition, and a post. None of them is a strategy by itself.
A small team can copy the logic on a sheet of paper. Put the desired decision in the center. Around it, write the people who can make it, block it, legitimize it, explain it, or make it expensive. Mark what each person currently believes. Then decide the order in which beliefs must move. The exercise is less glamorous than brainstorming slogans. It is also much closer to power.
Mercury's bet, sustained across more than a quarter century, is that public opinion is not weather after all. It has fronts, pressure systems, and instruments. The firm cannot command them. But it can read more of the sky than a client standing alone.