The Guardian has appointed Washington-based journalist Michael Tomasky as editor of its US website, Guardian America.
His role, when he begins on 7 May, will be to increase the newspaper's online presence in North America and enhance the site's news and front page.
The Guardian's blogging network, Comment is Free, will be expanded for an American audience.
The site will have an America-focused front page, which will be located at guardianamerica.com.
Guardian editor Alan Rusbridger said: "We already have a substantial and growing US audience and Michael's skills and experience will enable us to build on this success."
Tomasky said he was "honoured" to take part in Rusbridger's US strategy.
Until last year, Tomasky was editor of The American Prospect, a liberal Washington political magazine and has worked for The Village Voice and the New York Observer.