 Following a year as a research fellow at the Freedom Forum Media Studies centre at Columbia, Guttenplan moved to London in 1994.He has taught American History at University College and at Birkbeck College, and is a frequent commentator on American culture and politics on the BBC.In 2001 Guttenplan's interest in the use of the British libel laws to silence criticism led him to write about the suit brought by British author David Irving, who claimed no Jews were killed in gas chambers at Auschwitz, against American academic Deborah Lipstadt, who had called Irving "one of the most dangerous spokespersons for Holocaust denial."