Dr. Winnie Hallwachs is a tropical ecologist who has worked for many years in the ACG as a researcher and technical advisor to Área de Conservación Guanacaste (ACG). She has worked closely with Dan Janzen in the development and implementation of biodiversity projects and programs and in the founding of ACG's formal non-profit partner, the Guanacaste Dry Forest Conservation Fund.
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- Daniel Janzen
- Winnie Hallwachs
- Sigifredo Marín
- Luz María Romero Villalta
- Alejandro Marín
- Eugenie "Jenny" Phillips-Rodríguez
- Selena Avendaño Leadem
- Roberto Fernández
- Felipe Chavarría
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- Monique Gilbert
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- Winnie Hallwachs
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- Terri McCarthy
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