[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2008/SHOWBIZ/Movies/11/26/review.milk/art.milk.jpg caption="Sean Penn, seen here in his Oscar-winning role as Harvey Milk, is set to return to Haiti."]
Oscar-winning actor Sean Penn spent three weeks in Haiti following the January earthquake, living in a tent and witnessing first-hand the devastation.
On tonight's AC360°, the Hollywood star talks to Anderson from Haiti and his campaign to stop a potential public health disaster.
Read more about the J/P Haitian Relief Organization, and watch tonight's AC360° at 10p E.T.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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