The man in charge of the troubled World Trade Center project has resigned. “Kevin Rampe’s departure comes at a particularly sensitive moment for a rebuilding effort that has recently been plagued by bad news. The construction of the Freedom Tower, the site’s most prominent structure, is months behind schedule, and faces even greater delays after the New York Police Department last month delivered a disturbing assessment of its security shortcomings. Larry Silverstein, the lead developer of the site, has signaled that he may need hundreds of millions of dollars from the government to address the security concerns.”