[3] On October 31, 2014, Parsons Brinckerhoff became a wholly owned independent subsidiary of WSP Global,[4] a Canadian-based professional services firm.

[7] Parsons Brinckerhoff also designed the Cape Cod Canal, which opened in 1914 [8] and charted the course of a railway in China from Hankow (Wuhan) to Canton (Guangzhou), a line that is also still in use today.

In October 2010 Balfour Beatty acquired Halsall Associates, which became a subsidiary of Parsons Brinckerhoff and part of its Canadian operations.

On September 3, 2014, it was announced that WSP Global had made an offer to purchase Parsons Brinckerhoff from Balfour Beatty plc for US$1.24 billion.

[34] The firm is involved in Long Island Rail Road's East Side Access to Grand Central Terminal in New York City,[35] with a planned opening of December 2022.

[42] Parsons Brinckerhoff partnered with rival engineering firm Bechtel to build the troubled Big Dig in Boston, Massachusetts.

The Big Dig, or Central Artery/Tunnel project as it was officially known, was intended to replace an elevated Interstate freeway and connecting roads with a tunnel system underneath Boston.

Due to the poor construction, it has been estimated that the Big Dig's life span will be far short of the original specification that taxpayers paid for.