School of Earth, Energy & Environmental Sciences


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  • Johannes Besold

    Johannes Besold

    Graduate Visiting Researcher Student, Graduate Visiting Researcher

    Current Research and Scholarly InterestsJohannes Besold is a visiting PhD candidate in the Fendorf Lab within the Earth System Science Department at Stanford University. In his PhD project, Johannes studies the influence of thioarsenic species on arsenic complexation by natural organic matter. To expand our understanding of arsenic mobility in sulfidic, organic rich systems, he uses X-ray absorption spectroscopy in combination with mass spectroscopic methods to identify the speciation of arsenic, iron, sulfur and carbon in the environment.

  • Julio Enrique Herrera Estrada

    Julio Enrique Herrera Estrada

    Postdoctoral Research Fellow, Earth System Science

    BioJulio E. Herrera Estrada is a Postdoctoral Scholar at Stanford University’s Department of Earth System Science working with Prof. Noah Diffenbaugh. He uses satellite data to calculate the impacts that climate extremes have had on electricity generation globally. Moreover, Julio is interested in developing recommendations for sustainable and resilient management of complex water-energy-food systems, and implementing risk identification, prevention, and management mechanisms for droughts and other natural hazards.

    Prior to Stanford, Julio obtained his Ph.D. in Environmental Engineering and Water Resources at Princeton University, where he also pursued a certificate in Science Technology, and Environmental Policy at the Woodrow Wilson School of Public and International Affairs. At Princeton, Julio studied various aspects of droughts, including how they evolve in time and space and how they may be affected by climate change. He also quantified the impacts that droughts have had on pollutant emissions from the electricity sector in the Western U.S.

    Julio was awarded the NASA Earth and Space Science Fellowship in 2014, and in 2015 he participated in the Young Scientists Summer Program at the Institute for Applied Systems Analysis. He has presented at several conferences including the Fall Meeting of the American Geophysical Union, and has been invited to present at The World Bank Group. In 2015, Julio co-founded Highwire Earth, an interdisciplinary online publication on sustainable development, where the Princeton University community can share their work and insights. He also served as President of the Latino Graduate Student Association and of the Graduate Student Representatives in the Civil and Environmental Engineering Department at Princeton.

    Julio received his B.S. in Applied Mathematics from Columbia University. There he was involved with the Columbia International Relations Council and Association and the Columbia Student Chapter of Engineers Without Borders. Julio is originally from Mexico City, Mexico.

  • Mostafa Momen

    Mostafa Momen

    Postdoctoral Research Fellow, Earth System Science

    BioMostafa Momen is currently a postdoctoral scholar in the School of Earth, Energy and Environmental Sciences at Stanford University. In his postdoc, he studies the effects of water availability on vegetation dynamics with the help of remote sensing satellite data. He did his undergraduate work in Civil and Environmental Engineering at Sharif University of Technology. Inspired to explore the mysteries of fluid motion, he started his Ph.D. in the environmental fluid mechanics lab at Princeton University, where he was awarded the Gordon Y.S. Wu Fellowship in Engineering. During the 2014-2015 academic year, he was also an exchange scholar in the Department of Mechanical Engineering at MIT. In his Ph.D. research at Princeton, Mostafa investigated the underlying dynamics of the unsteady atmospheric boundary layer by integrating numerical simulations and mathematical modeling to overcome uncertainties associated with wind-energy forecasting.