The 23 lawyers and lobbyists of Washington, D.C., law and lobbying boutique O’Connor & Hannan will merge with California-based law firm Nossaman Guthner Knox & Elliott today. The combined firm will have more than 150 attorneys and lobbyists across eight offices nationwide. In Washington, the firm will operate under the name Nossaman/O’Connor & Hannan. In the Arlington, Va., Austin, Texas, Los Angeles, Orange County, Calif., Sacramento, San Francisco and Seattle offices, the combined firm will be called Nossaman.

O’Connor is the latest in a string of Washington boutiques to announce unions with bigger firms. Troutman Sanders and Washington litigation boutique Ross, Dixon & Bell, for example, announced their plan to combine last week. And Kilpatrick Stockton acquired D.C. corporate and financial transactions firm Muldoon Murphy & Aguggia last month.

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