Wick Simmons, the former CEO of Nasdaq, started working on Wall Street in Lower Manhattan after graduating from business school in 1966. Today, he barely recognizes the neighborhood.
"Wall Street, as I knew it, is gone," Simmons says.
For centuries, Wall Street was the home of the the biggest banks in the world. The attacks on the World Trade Center on 9/11 completely changed that as many executives questioned the wisdom of having an entire industry consolidated in one place.