Lewis PR, a San Francisco-based digital communications company with offices around the world, said it has acquired the Davies Murphy Group, a public relations firm headquartered in Burlington.

Financial terms of the acquisition are not being disclosed. In 2012, the Davies Murphy Group, or DMG, had revenues of nearly $9 million; the firm has 65 employees.

Eric Davies, who founded DMG in 1998, and partner Andy Murphy will continue to lead the firm under the DMG name, Lewis PR said in its press release.

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After the acquisition, Lewis PR said it projects global revenues of more than $45 million. Its global head count is now 420 employees.

“There can be no clearer statement of our global ambitions than this deal with DMG,” Lewis PR chief executive Chris Lewis said in a statement. “This is the third acquisition Lewis has made in the last five years, and we’re proud to welcome the DMG team. For too long, global brands have been starved of a communications partner which is global in its outlook, digital to its core, that offers an integrated approach to marketing. As a challenger itself, Lewis works with challenger brands around the world to make a real impact.”