Cassidy & Associates is a government-relations firm based in Washington, D.C. In 2018, the company received $14,170,000 in income from various companies for lobbying of the United States government. According to The Washington Post its founder, Gerald Cassidy, was once worth $125 million, possibly the richest Washington lobbyist. In 1999 and 2000, Cassidy & Associates led all lobbying firms in reported income.