Vali Nasr, an Iranian-American academic, is serving as senior adviser to Richard Holbrooke, the US special representative for Afghanistan and Pakistan.
A professor of International Politics at the Fletcher School of Law and Diplomacy and senior fellow at the Council on Foreign Relations, Nasr is best known for his work on Iran and Sunni-Shia tensions in the Middle East.
In a videotaped appeal in March, Barack Obama, the US president offered a "new beginning" in US-Iranian relations, calling for renewed exchanges and greater partnership. Iranian officials said action was needed to repair the relationship, but welcomed his words.
Here, Nasr talks to Al Jazeera about Obama's overtures to Tehran and increasing tension between some Arab states and Hezbollah ahead of crucial elections in Iran and Lebanon.
For full interview, click here
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