Introducing Ellie Callahan, a geochemistry researcher at the Illinois State Geological Survey (ISGS) a division of Prairie Research Institute! With a B.S. in Geology and Environmental Studies from the University of Wisconsin Madison and a M.S. in Geology from the University of Oklahoma, Ellie's journey is fueled by a passion for understanding the Earth’s complex systems and for interdisciplinary problem-solving. Currently, as a visiting scientific specialist in geochemistry, she delves into groundwater vulnerability assessments at Illinois Nature Preserves and leads an exciting project revisiting outstanding geological features across the state. We sat down with Ellie to hear how she navigates the fascinating intersection of research, industry, and the great outdoors.
Tell us a little bit about yourself and your role at PRI?
I am thrilled to have joined the Illinois State Geological Survey (ISGS) Fall of 2023! I originally received my BS in Geology with a Certificate in Environmental Studies at UW Madison and continued my education with a master’s in Geology at the University of Oklahoma. In Oklahoma, I utilized a variety of sedimentological methods to better understand the enigmatic midcontinent Permian “red beds”. In my current position as a Visiting Scientific Specialist in Geochemistry I am focused on conducting groundwater vulnerability assessments at Illinois Nature Preserves with a small team. Additionally, I am working on a relatively new project focused on revisiting a list of ‘outstanding geological features’ across Illinois. This list was developed by an ISGS geologist in 1978 and has not been revisited since. I am excited that my job takes me to some of the most beautiful and geologically significant areas in Illinois!
What drew you to your area of work or study?
I always loved science, but I struggled with which one to pursue as a major in college. When I stumbled across geology, I learned that geologists excel at cultivating an interdisciplinary skillset of chemistry, physics, paleontology, and petrology. I feel as though I am at the crossroads of all applied sciences, and it is invigorating to use an interdisciplinary approach to think critically about real-world problems. My attention turned towards state geological surveys when I was a junior in college and I became an intern at the Wisconsin Geological and Natural History Survey. I loved that survey geologists carry out work that is often at the intersection of academia and industry, so I made it my goal to work for one again after I finished my master’s.
What tools are indispensable to your work?
For nature preserves vulnerability assessments we utilize two main tools: a field computer in the form of an iPad Pro and a Hydrolab probe. On the iPads we use ESRI Survey123, ArcGIS online, and Field Maps. My team frequently uses a web map of Illinois with several different layers of information regarding geology, topography, soils, hydrology, and land use so we can examine a site before we step foot on it. Our findings are then recorded in a field form on Survey123 that generates a report of the site including the final assessment of its potential to be impacted by contaminated groundwater. When surface water chemistry warrants investigation a Hydrolab probe provides temperature, pH, specific conductivity, and dissolved oxygen data.
What questions do you get asked most frequently about your career?
“So... you just look at rocks?” No! Geology is the holistic study of the earth, not just rocks! Though I do have an affinity for rocks, most of the work I do at PRI is concerned with groundwater, how it moves through rocks and sediments, its potential to become contaminated, and how that might impact a nature preserve. Geologists are responsible for understanding groundwater and surface water to ensure people have access to quality water resources, carbon capture and storage for mitigating our carbon footprint, critical mineral exploration for products essential to our lives, and so much more
Do you have any other interests in your field?
Another aspect of earth science that is important to me is outreach and education, specifically regarding Earth’s deep time history. I truly believe that one of the most valuable skills a person, earth scientist or not, can possess is a sense of time literacy. It helps us as humans understand the natural cycles of the earth and the timelines on which they occur. That way, when these cycles become unbalanced or begin happening more rapidly, we can better understand our impact on the earth system and the environmental issues that may happen as a result. I always love talking about this subject, so feel free to contact me or stop by my office!
What advice would you give to those just starting out in your field?
Be curious and follow your passions but don’t shy away from developing hard skills too. Nowadays, having GIS software experience as a geologist is invaluable as well as coding and knowledge of data visualization. Remember that you are capable of learning new skills if you set your mind to it, and don’t be afraid to make mistakes and learn from them. Your coworkers and supervisors have likely been in your line of work for a long time and are fantastic resources, so ask questions and stay curious!
What do you do in your free time (i.e., hobbies, family life, etc.)?
I love to play tennis and badminton (I’m warming up to pickleball). I am always looking for new people to challenge in racket sports! Textile art projects in the form of weaving, some stained glass, and a new adventure into embroidery occupy some of my free time. I also enjoy backpacking, kayaking, and camping.
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Ellie works at the Natural Resources Building on the U of I Urbana campus and can be reached at elliecal@illinois.edu.
