John Jansen

John Jansen is a seasoned Principal Geophysicist and Hydrogeologist with extensive experience in groundwater resource management, geophysics, and environmental projects. Currently employed at Collier Consulting, Inc. since January 2018, John specializes in high resolution seismic surveys, mine hydrogeology, and groundwater modeling. Prior positions include Principal Technical Specialist at Leggette, Brashears & Graham, Inc. and Senior Managing Hydrogeologist at Entrix, Inc., where John contributed to various projects related to water supply and alternative energy. With a Ph.D. in Geological Sciences specializing in Geophysics from the University of Wisconsin-Milwaukee, John has also held leadership roles at Aquifer Science & Technology, Layne GeoSciences, and other firms, demonstrating strong business development and technical oversight skills throughout a diverse career spanning several decades.