John Gallagher, a spokesman for Tishman Construction, the general contractor overseeing construction of the towers and hub, said DCM hasn't caused any delays and the contractor is working overtime on its projects.

WSJ: Steel Firm's Woes Snag World Trade Center

An impoverished peasant from Yemen who emigrated to Saudi Arabia, he started out as a general contractor in 1931 and built one of the largest construction companies in Saudi Arabia, amassing a fortune estimated to be at least a billion dollars.

FORBES: The family business