The distinguished historian Oscar Handlin recently passed away, at 95.
Here is an obituary, from The New York Times:
http://www.nytimes.com/2011/09/24/us/oscar-handlin-historian-who-chronicled-united-states-immigration-dies-at-95.html
Here, too, is an amazon link to for his well-known book about immigration, The Uprooted: The Epic Story of the Great Migrations That Made the American People. The book received the 1952 Pulitzer Prize for history.
http://www.amazon.com/Uprooted-Oscar-Handlin/dp/0316343137/