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Hill & Knowlton is a public relations consulting company. It is headquartered in New York City, United States. The business was founded in 1927 by John W. Hill. It operates in the...

Ruder Finn is a Public relations and communications consultancy. It is headquartered in New York City, United States. The business was founded in 1948 by David Finn and William Rud...

APCO is a PR firm based in Washington, D.C. It is headquartered in Washington, D.C., United States. The business was founded in 1984. It operates in the public relations industry.