Poop Group Alumni

Keegan Cooke

Keegan is a dynamic scientist and entrepreneur with a passion for effecting positive change in the world by arming appropriate technology development with entrepreneurial drivers. His previous research has spanned many scientific disciplines, from laser physics to genetics, with positions held at various universities throughout the U.S. and abroad. Prior to coming to Stanford, Keegan acted as Principal Research Scientist for Trophos Energy Inc. – a start-up which had focused on the commercialization of undersea microbial fuel cell technology – until the company was successfully acquired in 2010.

At Stanford, Keegan is interested in the role of technology innovation and entrepreneurship in improving water resource delivery in developing areas, particularly those with extremely high population densities. Aside from this academic work, Keegan continues to be actively engaged in industry. He currently serves as Executive Director for Keego Technologies, LLC – a small product design company, which combines primary science education with crowd-sourced technology development ( www.keegotech.com ) – and is involved in other technology projects, such as ultra-low-cost PCR machines, SODIS indicators, and assistive technologies.

Yoshika Crider

Yoshika graduated in 2013 with a BS and MS in Environmental Engineering, with a minor Human Biology. She continues to work with other Poop Group members to design a low-cost chlorine diffuser as part of a community-level water disinfection project in Dhaka, Bangladesh. She will begin her PhD work at the University of California-Berkeley in autumn of 2015.

Angela Harris

Angela completed her PhD in Environmental Engineering and Science (EES) in 2015, focused on the measurement and mechanisms of biological contamination of drinking water in resource-constrained environments. Angela received her BS in Chemical and Biomolecular Engineering from the Georgia Institute of Technology, and her MS in Environmental Engineering & Science at Stanford in 2010.

Mia Mattioli

Mia Mattioli completed her PhD student in Environmental Engineering and Science in 2014, focusing on the risk of diarrheal diseases to children in developing countries from different exposure routes in their environment. She is currently a post-doctoral scholar at Emory University in Atlanta.

Maika Nicholson

Maika graduated in 2013 with an MS in the Environmental Fluid Mechanics and Hydrology program and an Engineer’s Degree from the Civil and Environmental Engineering department. She worked on the impacts of water-resale in peri-urban Maputo, Mozamibque, and her own research focused on modeling the water source choices made by Maputo households.

Sebastien Tilmans

Sebastien is a third-year Engineer’s degree student in the Environmental Engineering and Science program at Stanford, after having completed his M.S. in Environmental Engineering at Stanford in 2010. He received the National Defense Science and Engineering Graduate fellowship, and is a dual member of the Poop Group and the Criddle Group. He focuses his research on energy recovery from wastewater, and how this recovery can improve the long-term operation and maintenance of sanitation systems. Sebastien’s overarching passion is to transform society’s waste streams from liabilities into assets for social, environmental, and economic good. A related goal of his is to express this passion in a catchy t-shirt slogan. Poop can make the world a better place …

Sebastien is a Belgian-American born in Washington D.C. and raised in Maryland. He earned a Bachelor of Civil Engineering degree at Cooper Union in New York City in 2007. He then went to Panama for 10 months under a Fulbright Scholarship, working with the Smithsonian Tropical Research Institute to build small-scale sanitation systems and research opportunities for producing biodiesel from local waste vegetable oil. After beginning his studies at Stanford, Sebastien returned to Panama for an additional 8 months to expand his sanitation project under a USAID-funded grant. The systems he built in Panama are the centerpiece of his Engineer’s degree thesis.

In this picture, Sebastien is assembling components for an anaerobic digester with local contractor Gary Gomez on the island of Bastimentos, Panama. When he’s not covered in mud or thinking about sewage, he likes to swim, ski, waterski, draw, and explore.

Valentina Zuin

Valentina was born and grew up in Milan, Italy and she is a PhD student in the Emmet Interdisciplinary Program in Environment and Resources (E-IPER). Valentina’s focus is on water service delivery in peri-urban areas in developing countries. In particular, she is interested in understanding how water utilities learn to serve poor consumers, and how services provided by alternative providers such as water resellers and small scale private providers can be better integrated with the service provided by utilities.

Valentina’s interest in urban issues in developing countries started in Lima, Peru, where she researched business practices of informal street vendors and micro-entrepreneurs. Valentina became passionate about infrastructure development while investigating a slum-upgrading project in Salvador de Bahia, Brazil, which provided housing and basic infrastructure to more than 150,000 people living on stilts.

Before starting her PhD, Valentina worked for three years for the Water and Sanitation Program of the World Bank based in Maputo, Mozambique. Her responsibilities included supporting the Planning Department of the National Directorate of Water of the Government of Mozambique, the peri-urban unit of the water regulator, and the water utility. Valentina also worked on rural water and peri-urban water in Angola and did some work on small towns in the African continent.

Valentina holds a BS in Public Economics from Bocconi University, Milan, Italy, and a Master degree in International Development and Regional Planning from MIT, Cambridge, MA.

Valentina loves traveling and learning about different cultures and traditions, playing tennis, swimming, skiing, having nice dinners with friends, Nutella, and walking and diving in Caribbean beaches.