# People Sort & Filters close ## Filters Profile Type expand\_more - Faculty (1) - Visiting Scholar (4) - Visiting Faculty (2) - Staff (2) - Associated Researchers (1) - Graduate Students (2) - Gone, But Not Forgotten... (34) Search Within Results Search Within Results search ## 46 results Show filters filter\_alt Sort by Last Name A-ZLast Name Z-A sort list grid\_view ## 46 results [### David Johnston ](/people/david-johnston) Professor 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... ![David Johnston](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/2025-08/Johnston_Dave_02-scaled-1-aspect-ratio-1-1-300x300.jpg?itok=GFSqkJqm) [### Val Aguilar ](/people/val-aguilar) 1st Year Ph.D Student She/Her/Hers Val received her BS in Earth Sciences (paleobiology & geology) from UC Santa Barbara in 2021. As an RA at Johns Hopkins University, she became interested in using lab and field techniques to answer questions related to perturbations in... ![Val Aguilar](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/val_aguilar.jpg?itok=QyuYCJz1) [### Erin Beirne ](/people/erin-beirne)Former Johnston Lab Manager Now a Research Associate in marine environmental chemistry at Bigelow Laboratory for Ocean Sciences ![erin.jpg](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/erin.jpg?itok=FMC8R4aR) [### Emma Bertran ](/people/emma-bertran) Former 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... ![Emma_photo](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/dsc_0086_1.jpg?itok=rWbxNui8) [### Alex Bradley ](/people/alex-bradley)Former Postdoctoral Fellow Now on the faculty at Washington University at St Louis. ![alex.jpg](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/alex.jpg?itok=IRcTqwBc) [### Amanda Calhoun ](/people/cerys-holstege) Ph.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... ![acalhoun](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/acalhoun_1.jpg?itok=BIrjpehQ) [### Alyssa Chan ](/people/alyssa-chan) Former 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... ![img_1391.jpeg](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/img_1391.jpeg?itok=DaAlZyW0) [### Chloe-Rose Colombero ](/people/chloe-rose-colombero) Former 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... ![Chloe-Rose](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/screen_shot_2020-04-17_at_11.00.46_am.png?itok=vyMiuSth) [### Ben Cowie ](/people/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... ![ben_nose_hill.jpeg](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/ben_nose_hill.jpeg?itok=UJ_d7YPy) [### Daniel Crocker ](/people/esther-kennedy) Postdoctoral 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... ![Daniel Crocker](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/2025-08/Crocker_Daniel_01-scaled-aspect-ratio-1-1-300x300.jpg?itok=Ndt5XgUJ) [### Peter Crockford ](/people/peter-crockford) Post-doctoral Fellow person [### Vivien Cumming ](/people/vivien-cumming)Former Research Associate, Harvard University Viv is a photographer, filmmaker and writer specialising in documenting Earth science stories and expeditions. After postdocs at McGill and Harvard, Viv moved into science communication and now works with top scientists from around the world to make their... ![Viv](/sites/g/files/omnuum8991/files/styles/hwp_4_5__690x865/public/johnstonlab/files/drviv-8377.jpeg?itok=h_SUJXL7) - Previous page chevron\_left - [1](?page=0 "Current page") - [2](?page=1 "Go to page 2") - [3](?page=2 "Go to page 3") - [ Last page 4 ](?page=3 "Go to last page") - [ Next page chevron\_right ](?page=1 "Go to next page")