The Peabody Essex Museum.

The Peabody Essex Museum (PEM) of Salem, Mass., has chosen New York-based Ennead Architects to design its $200-million, 175,000-square-foot expansion. Groundbreaking will begin in 2015, and the project is scheduled for completion in 2019.

Ennead Architects (formerly Polshek Partnership) was selected from a group of firms invited to take part in a design charrette earlier this summer. Past notable projects by Ennead include the acclaimed renovation and expansion of the Yale University Art Gallery, finished in 2012.

This expansion project is part of a $650 million advancement campaign for PEM, of which $570 million has been raised thus far.

The campaign emphasizes growing the museum's endowment and long-term planning. It will add $350 million to the museum's current endowment of $280 million to total $630 million, making it one of the largest of any art museum in the country. The campaign's remaining $100 million will be used to finance various infrastructural improvements.