People
Faculty
David Johnston
johnston@eps.harvard.eduProfessor of Earth and Planetary Sciences
& Co-Director of Graduate Studies
He/Him/His Primary research interests: Isotope geochemistry and historical geobiology; re-animating ancient ecosystems and ocean chemistry using stable isotope systems, chemical speciation techniques, modern microbial experiments (for calibration) and...
Staff
Julien Foriel
julien_foriel@fas.harvard.eduResearch Scientist
He/Him/His I am an isotope geochemist, and like all isotope geochemists, I like to build and tinker with instruments, develop new analytical methods and new isotopic tools to understand elemental cycles on Earth. I am particularly interested in the...
Associated Researchers
Daniel Crocker
dcrocker@fas.harvard.eduPostdoctoral Fellow
He/Him/His Dan is a stable isotope geochemist interested in the sources, transformations, and environmental cycling of organic matter in a variety of geochemical environments—from ancient meteorites to the modern Earth. He completed his Ph. D. at the...
Graduate Students
Amanda Calhoun
acalhoun@g.harvard.eduPh.D Student
She/Her/Hers Amanda received her B.A. in Chemistry and Earth Sciences from Dartmouth College in 2023. Her research has focused on understanding the relationship between archaeal lipid production and geochemical conditions in hydrothermal springs. At...
Charlotte Minsky
cminsky@g.harvard.eduGraduate Student
Charlotte is a graduate student in the Wordsworth Group.
Visiting Faculty
Eve-Lyn Hinckley
Eve.Hinckley@Colorado.eduVisiting Professor
Eve-Lyn Hinckley’s research focuses on studying the elements that underlie all life on Earth, with an emphasis on how they are changed by human activities and how those changes feed back to affect human welfare. Dr. Hinckley earned her Ph.D. in Geological...
Mark Thiemens
mthiemens@ucsd.eduVisiting Professor
Thiemens' research involves mass independent isotope effects and their application to solar system origin, origin and evolution of life of earth, cosmochemistry (lunar, meteorites and Mars), climate change and measurements of oxygen and sulfur isotopes...
Visiting Scholars
Anna Waldeck
waldeck@g.harvard.eduFormer Graduate Student
Now a Post-Doctoral Fellow at Northwestern University
She/Her/Hers Anna completed a BSc in Chemistry and in Geophysical Sciences at the University of Chicago in 2014. Since 2013 she has worked in a stable isotope ratio laboratory there, measuring oxygen isotope ratios in phosphates contained in small shelly...
Gone, But Not Forgotten...
Alex Morgan
Former Thesis Student
Alex is now at Cambridge University working on her master's degree.
Alyssa Chan
alyssachan@college.harvard.eduFormer Undergraduate Thesis Student
Alyssa is a senior concentrating in Chemistry and Earth and Planetary Sciences, with a secondary field in the Comparative Study of Religion. She joined the Johnston group in Summer 2014. Her thesis research involves evaluation of organic molecules as...
Ana Gonzalez Valdes
gonzalezvaldes@g.harvard.edu5th Year Ph.D Student
Ana Gonzalez Valdes received her B.A. in Earth Sciences from Columbia University in 2016. At Columbia and Caltech she worked to understand how microbes in unique environments cycle nutrients like phosphorus and sulfur. At Harvard Ana will be spanning the...
Andy Masterson
andyM@earth.northwestern.eduFormer Ph.D student
now works at the Northwestern University IRMS Lab
Beck Saine
bsaine@college.harvard.eduFormer Undergraduate Research Assistant
he/him/his or they/them/theirsBeck is a rising junior at Harvard College pursuing a joint concentration in Chemistry and EPS. He is starting as a research assistant in the Johnston Group in summer 2020 with plans to explore multiple topics within the...
Ben Cowie
Former Post-doctoral Fellow
Ben is an isotope geochemist with diverse interests in the Earth sciences. In the Johnston Group, he is currently exploring questions surrounding the evolution of the atmosphere and biosphere over the most recent billion years of Earth history using a...
Cecilia Sanders
Former Undergraduate Student
Chloe-Rose Colombero
crcolombero@college.harvard.eduFormer Undergraduate Research Assistant
Chloé-Rose is a senior at Harvard College concentrating in Organismic and Evolutionary Biology with a secondary field in Earth and Planetary Sciences, focusing on marine sciences. She joined the Johnston group in the summer of 2020 to work on a...
Daianne Höfig
dhofig@g.harvard.edu1st Year Ph.D Student
She/Her/Hers My name is Daianne, and I am originally from Brazil, where I obtained a BSc in Geology and an MSc in Geochemistry. During my studies at Texas A&M University, I transitioned from U-Pb zircon geochronology to organic geochemistry. Isotopes are...
Ella Hughes
3rd Year Ph.D. Student
Ella is coming to Harvard from the UK, where she completed a BA degree in Natural Sciences and MSc degree in Earth Science at the University of Cambridge. Her Master’s research at Cambridge and Caltech focussed on the sulfur isotope composition of organic...
Emma Bertran
ebertran@princeton.eduFormer gardute student
The intimate interaction between microbial life and earth leaves specific chemical signatures that record information on microbial activity, and paleo-environmental conditions. As a geobiologist, my goal is to interpret these signatures and reconstruct an...
Erin Beirne
Former Johnston Lab Manager
Now a Research Associate in marine environmental chemistry at Bigelow Laboratory for Ocean Sciences
Frasier Liljestrand
liljestrand@fas.harvard.eduFormer Graduate Student
Frasier got his BS in Earth Science from Rice University in 2013. While he was at Rice, he did research in biogeochemistry focusing broadly on trying to quantify global carbon fluxes and budgets. Here in the Johnston group Frasier hopes to expand his...
Haley Olson
haleyolson@g.harvard.edu3rd Year Ph.D. Student
She/Her/Hers Haley received a BA in Geology from Carleton College in 2017. Haley's research uses stable isotope geochemistry to constrain marine geochemical conditions throughout geologic time (thus far from the Archean to the Neogene). She is currently...
Jordan Hemingway
jordon.hemingway@erdw.ethz.chAssistant Professor/ETH Zurich
He/Him/His I'm interested in connections between the geologic and biospheric carbon cycles. Specifically, my work aims to understand how processes occurring in river basins transfer carbon between these two cycles in order to regulate atmospheric CO2...
Joseph Shaffer
Former Undergraduate Thesis Student
Joe was an undergraduate concentrating in earth and planetary science with a secondary in chemistry. His thesis is a paleoenvironment study of the Utica focusing on whether the geochemical trends observed are globally or locally forced and what that means...
Kalina Grabb
kalinagrabb@college.harvard.eduUndergraduate Thesis Student
Karina was an undergraduate joint concentrator in Earth and Planetary Science and Environmental Engineering who has been working with the Johnston Group since her sophomore year. Her interests in biogeochemistry carries across sulfur, oxygen, and nitrogen...
