- Preventing Pandemics at the SourceNigel Sizer is the executive director of the Preventing Pandemics at the Source initiative. Previously, he was president of Rainforest Alliance, global director of the Forests Program at the World Resources Institute, where he launched Global Forest Watch and the Global Restoration Initiative. Nigel received a masters degree in natural sciences and a Ph.D. in tropical ecology from the University of Cambridge.
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