Affiliates are researchers, practitioners or activists who work with Associates and Steering Committee members on specific projects. The Affiliate program enables like-minded individuals with common interests, visions  and approaches to establish links with each other, accross different regions: Latin America, Africa, Asia, U.S and Canada and Europe.


Selena Ahmed (USA) is an Assistant Profesor in Sustainable Food Systems at Montana State University. Originally a PPI student affiliate, she has since 2003 been assessing indigenous food production and consumption systems in health disparate environments,  as case studies to explore complex human environment relations. Though her primary area of expertise are the tea agro-forests of China's Yunnan Province, she has also conducted research in India, Morocco, Venezuela, Belize, the Dominican Republic and the USA. For a list of Selena's publications click here.


Alex Álvarez (Peru) is an anthropologist specializing in indigenous resource management, governance, development and property rights. He is a doctoral candidate at the Graduate Institute of International and Development Studies at the University of Geneva, Switzerland, based on his research on indigenous environmental governance and property rights in the Amarakaeri Comunal Reserve, Madre de Dios, Peru.  He serves a voluntary advisor to the regional indigenous federation, FENAMAD, since 2006, on matters relating to land rights, cultural landscapes and  resource conservation, particularly in the context of ongoing oil and gas development.

Ann Armbrecht (United States) is a writer and anthropologist (PhD, Harvard 1995) focusing most broadly on the relationship between culture and the environment. She is the co-producer of Numen: the Nature of Plants, the first feature length documentary on herbal medicine in the US and has led an audience engagement campaign to raise greater consumer awareness about the social and environmental impacts of medicine. She has also conducted research on indigenous conceptions of land in the context of conservation in northeastern Nepal. She is author of Thin Places: A Pilgrimage Home (Columbia University Press, 2009), an ethnographic memoir that received the Gold Nautilus Award. She is currently working with Sarah Laird on the Policy and Trade Program.


Lynn Clayton (UK), a zoologist by training, has worked for the last two decades with her Indonesian team to conserve the Nantu Forest in northern Sulawesi, Indonesia. Around 8000 people, most small farmers, live outside the Nantu Wildlife Sanctuary and Lynn’s team are working to support sustainable livelihoods such as cocoa and cattle farming for them. Lynn’s team also work closely with local schools to build local awareness, including through hosting stakeholder learning visits to Nantu by a range of groups, particularly local scouts. For a selected list of Lynn's publications click here.

Jon Corbett (Canada) is a community-based researcher interested in the use of digital multimedia by remote and marginal communities to document, store, manage and communicate their culture, language, history and traditional ecological knowledge. His research also explores the use of these technologies for the revitalization of culture and traditional environmental management practices, as well as externally through increasing their influence over regional decision-making processes. Jon has worked with communities in Australia, Indonesia, the Philippines and over the past six years with First Nations and Aboriginal communities in British Columbia. He is an assistant professor in the department of Community, Culture and Global Studies Unit at UBC Okanagan and co-director of the Centre for Social Spatial and Economic Justice.

Rosalinda Hidalgo (Mexico) is an ethnologist specialized in rural development, with more than ten years experience working on research action projects workng with indigenous and farmer organizations. Her undergraduate thesis received the first prize in the Concurso Nacional de Tesis de la Comisión Nacional de Áreas Naturales Protegidas. An active member of the  MIMOSZ (Manejo Integral de Montes  de la Sierra de Zongolica) working group, she has collaborated for several years with a number of PPI projects in the  Conservation and Managed Habitats and Cultural Landscapes and Resource Rights Program. She is  actively involved with the environmental justice movement surrounding the protection of river systems and people’s territorial rights in Mexico. 

Lilián González Chévez (Mexico) is a medical doctor and medical anthropologist with extensive experience working on issues relating to shamanism, cosmology and ritual, ethnobotany,  intercultural health and health-related aspects of migration.  Working closely with PPI Affiliate Paul Hersch she is developing and applying an innovative model of intercultural health (epidemiolgía sociocultural) in socially and economically deprived municipalities in Guerrero. She is a lecturer and researcher in the Department of Anthropology at the Universidad Autónoma del Estado de Morelos. 

Patricia Gerez (Mexico) is a biologist and forester based at the Universidad Veracruzana and specialised in community forestry, community-based resource and land-use management. Between 1994 and 2003 she worked with CCMMSS and its forest certification program under the SmartWood/FSC label. She collaborates with SENDAS, A.C and its program on the Pixquiac river basin, working with smallholders to environmental service projects in support of forest management and conservation. She is currently collaborating with PPI Steering Committee Member Citlalli López in the Sierra de Zongolica, Veracruz, and with PPI Advisory Committee Members Silvia Purata and Chuck Peters, developing a manual to allow communties to conduct their own growth rate studies on economically important tree species. 

Elysa Hammond (United States) is an ecologist working at the organic nutrition Clif Bar & Company, Berkeley, California. She is founder of the company's sustainability program and oversees company efforts to reduce its environmental impact. Elysa is the editor of the Clif Bar  Moving Toward Sustainability newsletter and serves as an advisor to the Clif Bar Family Foundation environmental grant program. She is part of the National Teach-in on Global Warming Solutions council, dealing with issues relating to climate change.  She has conducted research on traditional agricultural systems in Peru and Indonesia. For a selected list of Elysa's publications click here.

Paul Hersch Martínez (Mexico) is medical doctor, anthropologist and clinical phytotherapist.  He is a researcher at the National Institute of Anthropology and History where he directs the program 'Social Actors in the Medicinal Flora of Mexico', and a curator at the Museum of Herbalism and Traditional Medicine in Cuernavaca, Morelos (National Museology Prize, 1999).   He has worked extensively with community-based organizations and rural municipal authorities, including the CRAC (Coordinadora Regional de Autoridades Comunitarias, Guerrero) to help strengthen local capacities for health-related organization and delivery. He is a member of the Mexican Society of Clinical Phytotherapy and of the Permament Comission on Pharmacopea, and an Honorary Advisor to the Program for Integrative Health of the Secretary of Health of the city of Mexico.

Ruth Malleson (UK)  is an anthropologist with over twenty years’ experience working with rural people on issues relating to livelihoods and natural resource use and management, mainly in the humid forests of West and Central Africa and Southeast Asia as well as the rangelands of Southern Africa. A research associate at University College London’s Department of Anthropology, she also teaches on undergraduate and postgraduate courses in human ecology and anthropology, environment and development and works as an independent monitoring and evaluation consultant for a range of international, governmental and non-governmental organisations.



Rebecca McLain (United States)  is a natural resource policy analyst and cultural geographer specializing in participatory governance structures, environmental justice, and the links between natural resource tenure and environmental management practices. She has an interdisciplinary PhD from the College of Forest Resources at the University of Washington in Seattle, USA. She is co-founder of the Institute for Culture and Ecology, a nonprofit organization that specializes in research and education on the social aspects of environmental management issues. For a selected list of Rebecca's publications click here.



Heather McMillen (United States) has a PhD from the Department of Anthropology at the University of Hawai'i at M'noa. Her foci are medical anthropology, environmental anthropology, and ethnobotany. Over the last decade her research in Tanzania, East Africa has explored the intersections of local ethnomedical practitioners and biomedical practitioners, medicinal plant management and trade, and conservation. Heather teaches ethnobotany  at the University of Hawaii and is the Secretary for the Society for Economic Botany. For a selected list of Heather's publications, click here.



Fortunata Panzo Panzo (Mexico) is from the community of Duraznotla, Tehuipango, Veracruz. A native Náhuatl speaker, she recently graduated from the Universidad Veracruzana Intercultural – Sede Grandes Montañas de la Sierra de Zongolica, where she studied Intercultural Management for Development with a specializatiion in Sustainabilty. Her thesis derived in a community video on the traditional environmental knowledge of her community.  In 2011, and under the mentorship of Citlalli López and Patricia Negreros she began to collaborate with a CONAFOR-PPI project to support smallholders in the region to more effectively monitor and manage their family-owned timber plantations, helping organise several community workshops and producing two videos.


Alan Pierce (United States) is an independent researcher specializing in forest policy, subsistence use of forests and ecological literacy. His doctoral dissertation examines contemporary gathering traditions in Vermont and the reasons for their persistence or decline. Over the past 15 years Alan has worked as a consultant with a number of international NGOs to create policy frameworks for the sustainable harvest and trade of non-timber forest products. He is a long-term collaborator of PPI's Policy and Trade Program and has worked on several PPI manuals.



Louis Putzel (United States) is a scientist based at the Center for International Forestry Research (CIFOR) in Bogor, Indonesia. His main research interests relate to the economic botany of tropical timber and the connections between logging, smallholder forest management, and global markets. His doctoral work focussed on the structure of Chinese timber supply chains and their implications for the regeneration and management of Shihuahuaco (Dipteryx spp.), a key export timber.  He is now working on the forest-related effects of Chinese trade and investment in the Congo Basin, and is contributing to work about informal logging and trade in the context of changing international norms.  For additional details on China-in-Africa, click here. For a selected list of his publications, click here.

Adolfo Rebolledo-Morales (Mexico) is a biologist and graduate from the Masters program at the Centro de Investigaciones Tropicales of the Universidad Veracruzana. His thesis was awarded a national prize for the best ethnobotanical thesis by the Mexican Ethnobiological Society. His interests revolve around rural ethnoecology and cultural revitalization, especially among indigenous children and youngsters.  He works closely with PPI, promoting jonote (Trema micrantha) as a tool for supporting livelihoods and conservation, in Pahuatlán, Puebla, as well as strengthening resource management training programs in indigenous schools and universities in central Mexico. 

José Antonio Sierra Huelsz (Mexico) is a plant ecologist and tropical forester with an interdisciplinary perspective on community forest management. Over the past ten years Antonio has collaborated with PPI's Patricia Negreros, Silvia Purata, Chuck Peters and Paul Hersch on projects relating to community forest monitoring and management, communithy tourism and non-timber forest product management. He is particularly interested in the multiple drivers and implications of forest management practices.


Mary Stockdale (Canada) is an adjunct professor in the Department of Community, Culture and Global Studies at University of British Columbia, Okanagan branch (UBCO), where she teaches and conducts research related to community resilience, sustainability and natural resource management. She has 20 years experience working in Southeast Asia (mainly Indonesia and the Philippines) on community-based management of forests and non-timber forest products (NTFP). She works closely with the NTFP-Exchange Programme for South and Southeast Asia, a regional network of community organizations (mostly indigenous), local NGOS, and others. She is also an activist in her own community in Canada, working on resilience and sustainability initiatives.

Tamara Ticktin (United States) is an ethnoecologist, and associate professor of Botany at the University of Hawai'i at Manoa. Her interests center on the relationships between human communities and biological conservation. Her work focuses on assessing the ecological impacts of local and indigenous resource management practices and their implications for the conservation. Most of her work involves close collaboration with local communities and participatory research methods. She has carried out collaborative research in parts of Latin America, Asia, Africa and Hawai'i. 



Tarin Toledo’s (Mexico) interests lie mainly in the research and development of ecological bases from which to implement sustainable forest management practices. In 2006 she undertook a PhD in Forest Ecology from University of Aberdeen, UK during which she evaluated the effects of lianas on the regeneration of commercial tree species in tropical forest in Ghana. She has worked for Smart Wood / CCMSS conducting evaluations of forest certification in various communities in Mexico.