DSC_1838 Professor Sarah Stewart Johnson (PI)

I’m an assistant professor at Georgetown University and a visiting scientist at NASA’s Goddard Space Flight Center. I’m fortunate to get to work with some amazing people!  At present, my lab includes:

Elena Zaikova
I am a postdoctoral fellow investigating the evolution, adaptation and evidence of activity of microbial communities inhabiting extreme environments like Antarctica. My primary research interests lie in understanding how microbial communities assemble and function, and how they help shape the ecosystem.
unnamed Maëva Millan
I am a postdoctoral fellow working on the chemical and mineralogical composition of the Martian surface using the Sample Analysis at Mars (SAM) experiment onboard the Curiosity rover of the MSL mission. In particular, I am searching for organic molecules and biomarkers on Mars and investigating methods of their preservation in various kind of Martian minerals. In addition to data collected from SAM, I work with Martian analog samples from terrestrial environments. I recently received my Ph.D in specialty Astronomy and Astrophysics in France on a similar project. My daily laboratory experiments are physio-chemical analysis using pyrolysis and wet chemistry coupled to gas-chromatography mass-spectrometry. I try to replicate SAM conditions as closely as possible to help data interpretation and the search of organic matter. Besides work, I love hiking and taking pictures of the beautiful places, landscapes and people I meet during my trips.
unnamed Nicole Wagner
I am a Ph.D student in the Johnson Biosignatures Lab. After receiving a B.S. from Stanford in physics with a focus on astronomy and a B.S. from Portland State University in biology, I decided to merge my interests in the study of life in extreme environments used as Mars analogs here at Georgetown. My foray into the world of extremophiles began in Anna-Louise Reysenbach’s lab at Portland State University where I spent my days sifting through the genome of hyperthermophilic archaea. In my free time, I re-watch episodes of Star Trek, obsess over all things SpaceX, and dote on my toy poodle.
DSC00351 Angela Bai
I am a recent graduate of Georgetown College. As a research assistant in the Johnson Biosignatures Lab, I research the ancient microbial communities of Antarctica’s Dry Valleys in order to understand how life can survive in extreme environments. I am fascinated by space and the diverse paradigms for thinking about life. Besides in Regents 511, I can also be found cooking or  geeking out about design.
DSC_3285 Mark Sutton (NASA GSFC)
IMG_0008 Julie Bevilacqua

Lab alums include:

maggie deirdre Ben Indo1 (1)
 Maggie Weng Deirdre Collins  Ben Johnson


IMG_0354 savannah 2015-05-22 15.07.15
Monica Soni Savannah Fuqua Allee Torres