"Please join us in welcoming your new colleagues and congratulating your newly promoted ones," said the memo, which was obtained by Capital New York. "And while you're at it, take a bow yourselves, for a month in which we shipped an awesome issue and set a new record for our total audience across our three sites."

David Graham, who has been an associate editor at TheAtlantic.com since he came over from Newsweek in late 2011, will become the politics editor for the site. Mr. Graham will take the reins from Garance Franke-Ruta, who is moving over to become a full-time politics writer.

Olga Khazan is coming over from The Washington Post to edit the Global Channel for TheAtlantic.com. Ms. Khazan was a reporter for the Post’s World section.

Elisa Glass will be the magazine's art director. Ms. Glass was the art director at Northern Virginia magazine. According to the memo, which notes that she won't get too stressed out in her new role since she is a certified yoga instructor, Ms. Glass "will be involved in all aspects of design for The Atlantic, from the look of our digital properties (websites, mobile apps, e-books, etc) to the design of the Dispatches and Culture File sections of the magazine."

And last week, the memo adds, former editorial fellow Esther Yi returned to the magazine as an associate editor.