#  Dr. David Johnston 

Professor of Earth and Planetary Sciences

& Co-Director of Graduate Studies

 

 

 



   ![David Johnston](/sites/g/files/omnuum8991/files/styles/hwp_4_5__480x600/public/2025-08/Johnston_Dave_02-scaled-1-aspect-ratio-1-1-300x300.jpg?itok=lOlLbeEq) 

 



 

 email <johnston@eps.harvard.edu> 

 laptop\_windows [ResearchGate](http://www.researchgate.net/profile/David_Johnston13) 

 laptop\_windows [Google Scholar](https://scholar.google.com/citations?hl=en&user=7Wo2JZ0AAAAJ) 

 laptop\_windows [ORCID](https://orcid.org/0000-0002-2487-1084) 

 

 



 

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 theoretical considerations.###  [CV](/file_url/240)



 

 

 





 

 

- ## Profile Type
    
     [Faculty](/faculty/faculty)