The network, which premieres on Aug. 20, announced the hire on Wednesday. Chen has worked at CBS News and PBS but is best known for a decade spent at CNN. She's been out of television for the past couple of years.
Paul Eedle, Al-Jazeera America's deputy launch manager for programs, called Chen "a strong journalist with a natural, warm presence on screen."
"America Tonight" will air each weeknight, but Al-Jazeera hasn't said exactly when. It is one of the few specific programs announced in advance of the launch.