Gregory, thanks so much for talking with us.

NPR: Obama Administration Turns Attention Toward Africa

So we've called upon Gregory Mankiw who was chairman of President George W. Bush's Council of Economic Advisors from 2003 to 2005, now a professor of economics at Harvard, an author and a blogger.

NPR: The Pressures Of Working In The White House

Mr. GREGORY MANIATIS (Migration Policy Institute): So we know, for instance, that in India about a third of the Internet startups there have been created by Indians who were in Silicon Valley in the '90s and the early parts of this decade.

NPR: U.N. Puts Spotlight on Global Immigration