on-ground team

Dylan Terrell
Executive Director

Dylan Terrell is a founding member of Caminos de Agua (originally CATIS Mexico) and has coordinated water programming, technology development, and community projects for the organization since 2011.  His work in rural Mexico is dedicated to creating low-tech, replicable solutions to locally acute – yet globally distributed – water quality problems.   His focus has revolved around the development and implementation of low-cost ceramic water filters for microbiological contamination, bone char production for fluoride remediation, low-tech rainwater harvesting innovations, and most recently biochar treatment systems for synthetic organic chemical compounds.  

Prior to working for Caminos, Dylan lived and worked in numerous communities throughout the U.S. and Latin America - including Argentina, Peru, Guatemala, Southern Mexico, Colorado, and Northwest Indiana - working on community development projects.  Dylan is fluent in Spanish and received his master’s degree in Global Sustainability and Rural Development in 2012 from Regis University in Denver, Colorado.  His final thesis analyzed the effects of neoliberal policy on rural Latin America and the implications of rural-to-urban migration on global sustainability.


Jennifer Ungemach
Development Director and Education Coordinator

Jennifer Ungemach, born and raised Pennsylvania, graduated from Juniata College with a degree in Peace and Conflict Studies and completed her master's degree in Agroecology and Sustainable Agriculture in Havana, Cuba. She has lived over a decade throughout Latin America where she has been involved in various projects in sustainable development. Jennifer first began work with Caminos de Agua as an instructor in a summer workshop on Agroecology in 2011. Currently, Jennifer acts as both the Development Director and Education Coordinator.  Jennifer is in charge of all workshop, field school and volunteer/internship coordination as well as national and international university, student group, and organizational partnerships.


Saul Juarez
Director of Community Projects

Saul Juarez, originally from Dolores Hidalgo (La Luz de Tranca,) is a passionate water advocate. He currently lives in a San Miguel de Allende community twenty minutes outside of town, by the Allende Reservoir. Over the course of the last ten years, he has woven together a wealth of life experiences, including community organizing in over twenty communities in the municipality. An active member in the Coalition in Defense of the Independence Watershed, Saul passionately advocates for more training opportunities for communities in sustainable water treatment and rainwater harvesting. In Caminos de Agua, he is responsible to generate collaborations with other organizations working in community development in the region, as well as design and give workshops
related to water and health.


Casilda Barajas
Healthy Water Promoter

Casilda Barajas, an architect by trade and a graduate of the UNAM.  A resident of San Miguel de Allende now for six years, she is busy as an architect specializing in design with reeds and an active promoter of reed construction.  Casilda promotes gray water recycling with biofilters and natural wetlands. She worked six years in Chiapas with this type of technologies as well as designing and building a network of micro community health clinics in Zapatista communities. She also participates in another civil association (INANA –Initiatives for Nature). Casilda designs learning materials and community outreach strategies for Caminos de Agua.


Aaron Krupp

Research and Technology Development Coordinator

Aaron Krupp, an Oberlin College/Caltech mechanical engineering graduate, coordinates our Research and Technology Development team. His priority is research and development on our water filtration media for arsenic and fluoride mitigation. Over the past few years, he has worked on rural wheelchairs and biodegradable sanitary pads in India, built some robots in California, worked to develop desalination systems in Australia, and even taught magic with a circus in Kathmandu. Most recently, Aaron returned from a twelve-month Watson Fellowship studying the relationship between poverty and technology in South and Southeast Asia and East Africa. Aaron is passionate about research into diverse "technologies designed for function and accessibility [that] can help break the cycle of poverty." Check out more of Aaron's work here.

Jeff Rottler

Jeff Rottler is an original founder of Instituto Tierra y Cal, A.C.  - a San Miguel-based nonprofit focusing on earthen construction - as well as CATIS Mexico (which eventually became Caminos de Agua).  Jeff is a sociologist and a builder who focuses on sustainable rural community development in Latin America and has primarily concentrated on earthen construction for the past decade.  While most of his time now is with his sustainable building company, Rottler-Campos Studio, Jeff still leads on the coordination of ceramic water filter production for Caminos de Agua.


Nico Vargas
Water Filter Systems

Nicolas Vargas is the lead on water filter quality. He tests flow rates and applies colloidal silver to the filters that meet the standard. He also constructs full systems, installing the filter into the carboy. Flow rate is essential to ensure adequate filtration of water impurities and colloidal silver treatment further eliminates the number 1 water-born sicknesses. Nico is fully trained in filter preparation and system construction and is now in charge of filter testing, system assembly, and training of new employees.


Fili Baltazar Vargas
Water Filter Production

Filiberto Baltazar, native of Montecillio de la Milpa - the community just on the North side of the river of the Caminos de Agua site and whose groundwater is contaminated with arsenic and fluoride. Fili is responsible for  t filter ceramic molding production. Fili's background in adobe making has translated well into ceramic filter. 




George Terrell
Chairman of the Board

George Terrell is one of the founders of Caminos de Agua. He has been a community organizer and social justice activist for more than 45 years. A lawyer by training, his current law practice is limited to the pro bono representation of non-profits.
George has a rich history with non-governmental organizations. He helped lead a community organization, Project Neighbors (Neighbors Corp.) in Valparaiso, Indiana for almost 20 years and is still active in its programs. Project Neighbors built a childcare center serving a diverse population, a community center, over 70 homes, and a health care center that now provides access to superior care for the formerly under and unserved citizens in 5 counties

Robert A. Lerner

Robert Lerner is a biologist, technologist and serial entrepreneur. A veteran of start-ups in renewable energy, outdoor gear and technology development, his business experience spans start-up, fundraising, product development (multiple patents), sales and marketing, and full-charge financial responsibility. A resident of Mexico since 1996, Rob is a practicing sustainability advocate, living in an all-solar home of his design, with rainwater harvesting, fruit and vegetable green roof, worm composting, and many other green features. His current career path is focused on bioenergy and biochar as a sustainability strategy for food, climate and environmental management, advising on multiple projects in Mexico, Costa Rica and Panama.

Rob has a B.A. in Environmental Studies from U.C. Santa Barbara (1975) and an M.S. in Botany from University of Washington (1978); he abandoned his Ph.D. research in 1980 to pursue a career in business, maintaining a lifelong commitment to science literacy.

Joshua Samson

Joshua currently is Director of Financial Reporting at Guggenheim Partners, a financial services institution.  He is responsible for the financial reporting application, holding company financial management, and forecasting and planning for several operating groups.  Prior to joining Guggenheim Partners, Joshua worked at Protiviti, an audit and consulting firm, performing IT security and compliance audits around the world.

Agustin Madrigal

Agustin Madrigal Bulnes graduated as a geologist from the Autonomous University of Mexico (UNAM). He has lived in Guanajuato State since 1994 and has participated in diverse projects, including developing Management Plans for Protected Natural Areas in different municipalities in the state (until 2001). From 2002-2005, he participated in the ¨Restore the Laja River¨Project, backed by the North American Wetland Conservations Act (NWCA). Since 2006 to date, he is the Director of the non-profit Save the Laja River, coordinating conservation projects and soil restoration and water in different rural communities as part of the National Program in Watersheds and Cities that is funded by the Fondo Mexicano para la Conservación de la Naturaleza, A.C. . As part of this program he was invited to participate in the International Seminar on Watershed Management hosted by the US Forest Service in Arizona en 2015.

Muriel Bevilacqua Logan

Muriel came to San Miguel with her husband Gordon in late 2002 after a career in international development, where she worked in recruiting, training and supporting field workers for appropriate development in agriculture, animal husbandry, veterinary medicine, refugee resettlement and other social interventions in some of the poorest and most troubled countries of the world.  Upon arrival she began almost immediately working with the non-profit Salvemos al Rio Laja. She was inspired by the organization's pursuit of appropriate, empowering projects with local communities in conservation and restoration of land and water resources in the troubled Upper Rio Laja Watershed.  As the problems of water scarcity and contamination, deforestation and erosion, over-pumping and poor use of water and land resources have increased,  she has participated in environmental education projects,  OCAS (Citizens’ Observatory for Water and Sanitation)  and other community-based efforts to signal to the residents and the government agencies at all levels possible appropriate interventions in the various crises.

Muriel is currently building a rainwater catchment system at her home in the San Antonio neighborhood to serve as a demonstration project to help local residents see how to deal with new disturbing levels of fluoride, arsenic and other elements in the domestic water.

Long-Term Volunteers

Current Volunteers

Elena Diek, Technical College Cologne (Germany) - Master's in Integrated Water Resources Management

Billy Thurston, EWB-UK

Sarah Mitchell, EWB-UK

Past Volunteers


Chantal KronenburgWageningen University (The Netherlands)

Cameron Plese, Brandeis University (Massachusetts, USA) - Master's in Sustainable International Development 


Olivia Hobson, EWB-UK


Will Mitchell, EWB-UK


Javier Sierra, EWB-UK