Sciences and Exploration Directorate

Callum Richard Wayman



Org Code: 610.1

Mail Code: 610.1
Greenbelt, MD 20771


Brief Bio

I am a scientific programmer with a background in hydrology and geoscience. I am passionate about open source tools, data, and generating useful data visualizations and services with Python. I am a contractor with SSAI at NASA Goddard Space Flight Center, and I work on the Data Tools and Services team as well as the JEDI/EWOK workflow team.

Current Projects


Visualization Programs

Part of my time is allocated towards developing and maintaining visualization tools and data delivery services via the Framework for Live User-Invoked Data (FLUID). Within this framework I aim to improve delivery for more on-demand visualizations and data download options that offer greater flexibility for researchers and decision makers who use our tools.

You can find the GMAO FLUID service here.

JEDI/EWOK Workflow Project

Theory & Modeling

The purpose of this project is to implement a new methodology for setting up and running experiments using GMAO models. The goal is to use the newly developed EWOK workflow system to create accessible tools for researchers to easily run these experiments without requiring in-depth knowledge about the operation and development of the models themselves.


Pennsylvania State University, State College, PA 2016 – 2018

M.S. in Geosciences, Specialization: Hydrogeology

Purdue University, West Lafayette, IN 2012 – 2016

B.S., Multidisciplinary Engineering, Concentration: Geological Engineering

Minor: Mathematics


Scientific Programmer/Analyst II


March 2021 - Present

Scientific Programmer/Analyst I


October 2019 - March 2021

NASA DEVELOP Assistant Center Lead


July 2019 - September 2019

NASA DEVELOP Participant


February 2019 - May 2019

Graduate Research Assistant

Pennsylvania State University Department of Geosciences - State College, PA

September 2016 - 2018

Talks, Presentations and Posters


Developing an understanding of anthropogenically sourced solute transport using high spatial resolution and long-term data sets.

Wayman, C., Russo, T., Hoagland, B., Forsythe B., Li, L., Brantley, S.L.


Oral Presentation at the Pennsylvania Groundwater Symposium

Variations in export of nitrate and other solutes across lithologies and land uses in a HUC 10 watershed.

Wayman, C., Hoagland, B., Forsythe B., Duncan, J., Brantley, S.L., Russo, T.


Poster Presentation at the American Geophysical Union Fall Meeting

Variations in export of nitrate and other solutes across lithologies and land uses in a HUC 10 watershed within the Susquehanna River Basin.

Wayman, C., Hoagland, B., Forsythe B., Brantley, S.L., Russo, T., Duncan, J.


Poster Presentation at the 13th Annual Susquehanna River Symposium

Qualitatively modeling solute fate and transport across scales in an agricultural catchment with diverse lithology.

Wayman, C., Hoagland, B., Forsythe B., Li, L., Russo, T., Brantley, S.L.


Poster Presentation at the American Geophysical Union Fall Meeting



Li, L., R. A. DiBiase, J. Del Vecchio, et al. V. Marcon, B. Hoagland, D. Xiao, C. Wayman, Q. Tang, Y. He, P. Silverhart, I. Szink, B. Forsythe, J. Z. Williams, D. Shapich, G. J. Mount, J. Kaye, L. Guo, H. Lin, D. Eissenstat, A. Dere, K. Brubaker, M. Kaye, K. J. Davis, T. Russo, and S. L. Brantley. 2018. The Effect of Lithology and Agriculture at the Susquehanna Shale Hills Critical Zone Observatory Vadose Zone Journal 17 (1): 180063 [10.2136/vzj2018.03.0063]


Peredo, J., C. Wayman, B. Whong, et al. A. Thieme, L. R. Kline, S. Yadav, B. Eder, V. Lenske, D. Portillo, S. McCartney, J. Fitz, P. Oddo, J. Keppler, D. Hively, J. Bolten, G. McCarty, and A. Lyon. 2020. UTILIZING LANDSAT AND SENTINEL-2 TO REMOTELY MONITOR AND EVALUATE THE PERFORMANCE OF WINTER COVER CROPS THROUGHOUT MARYLAND ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W11 125-130 [10.5194/isprs-archives-xlii-3-w11-125-2020]


  • NASA GSFC GMAO Peer Award - March 10th, 2021
  • DEVELOPer of the term - Nominee, Summer 2019
  • DEVELOPer of the term - Nominee, Spring 2019
  • Paul D. Krynine Scholarship - Fall 2017

Teaching Experience

I have been a Software Carpentry Instructor since December 2019. I have instructed workshops in four NASA DEVELOP terms in which I have taught fundamentals in Bash scripting, version control with Github, and Python programming.