Support services group WSP has been appointed to work as a consultant on Freedom Tower, the replacement for the World Trade Centre in New York. Cantor Seinuk, WSP's high-rise structural engineering specialist, is working with architects Daniel Libeskind and Skidmore, Owings & Merrill to flesh out their designs. Cantor Seinuk is also working on the Renzo Piano-designed London Bridge Tower. WSP has up to 10 people based in Piano's workshop in Paris.