Parsons Brinckerhoff Parsons, Brinkerhoff, Quade & Douglas (NY) Parsons Brinckerhoff Parsons, Brinckerhoff, Quade and Douglas WSP/Parsons Brinckerhoff Parson Brinckerhoff Parsons Brinckerhoff Parsons Brinckerhoff Parsons, Brinckerhoff, Quade and Douglas