The Illinois State Geologist serves as the authoritative spokesperson on matters of geoscience for the state of Illinois; represents Illinois with the Association of American State Geologists; and provides timely, accurate, objective information on research and scientific inquiries to the public, scientists, industry, and governmental agencies.
Activities of the Office of the State Geologist include:
- Research: Prioritizing, promoting, directing, and conducting geological research in Illinois with a focus on addressing key socially relevant issues as well as serving key constituents and stakeholders.
- Public policy: Working with local, county, state, federal, and international agencies on the relevance of the geosciences and their potential positive impact on laws, rule-making, and land- and water-use decision-making.
- Education: Educating the public on the geosciences’ importance (water and mineral resources, waste disposal, siting, construction, earth hazards, energy, and environmental protection) through presentations, publications, and online information.
- Collaboration: Working with the American Association of State Geologists, U.S. Geological Survey, and foreign geological surveys to develop, enhance, and implement programs that benefit both scientific organizations and the public.
State Geologist Steve Brown

State Geologist Steve Brown has held several key roles at ISGS over the past 19 years, including head of the Quaternary and Engineering Geology Section, chief scientist, and, most recently, deputy director. He has helped shape the survey’s direction through his commitment to applying geologic knowledge to real-world challenges. Steve’s research has advanced the understanding of the glacial geology and stratigraphy of the southern Lake Michigan region. He is currently working with the Illinois Department of Natural Resources’ Coastal Management Program to address issues affecting communities along the Lake Michigan shoreline.
Ask a Geologist
Are you curious about the geology of Illinois? Have you found a rock, mineral, or fossil that you would like to know more about? Ask a Geologist connects geology enthusiasts with Illinois State Geologist Steve Brown and other geologists at ISGS. Submit your questions and up to three photos using the Ask a Geologist webform!