Ron Klain, former White House Ebola response coordinator, speaks during a House Homeland Security Subcommittee hearing in Washington, D.C., U.S., on Tuesday, March...
Mark Zuckerberg, Chairman and Chief Executive Officer of Facebook, arrives to testify during the House Financial Services hearing on An Examination of Facebook...
Dr. Michael Osterholm, Regents Professor, McKnight Presidential Endowed Chair in Public Health, and director of the Center for Infectious Disease Research and Policy...