Faced with an avalanche of claims by workers who suffered respiratory illness while cleaning up the World Trade Center site after the Sept. 11, 2001, terror attacks, Southern District Judge Alvin Hellerstein has appointed two special masters to organize the cases.

Judge Hellerstein named Aaron D. Twerski, dean of Hofstra University School of Law and James A. Henderson Jr., a professor of Cornell Law School as special masters for the cases, which plaintiffs’ lawyers say could eventually number as many as 11,000.