LGS Administrative Staff


Chip Groat, PhD

Acting Director
Email: cgroat@lsu.edu
Telephone: 225-578-4998

Groat is a nationally renowned educator and government scientist. Most recently, he retired as president and CEO from the Water Institute of the Gulf. He was professor and director of the Center for International Energy and Environmental Policy and associate director of the Energy Institute at the University of Texas at Austin. He was also director of the United States of America Geological Survey under Presidents Bill Clinton and George W Bush.

Groat returns to LSU after many years in academia, government, independent research, and administrative positions. Groat’s prior tenure at LSU includes serving as the LGS director and state geologist (1978-1990) and as the executive director for Coastal, Energy, and Environmental Resources (1992-1995).

Chip Groat, PhD projects


Chacko J. John
Associate Director, Professor
Email: cjohn@lsu.edu
Telephone: 225-578-8681

Chacko J John is Assistant Director and Professor Research at the Louisiana Geological Survey, Louisiana State University. He served as Director and State Geologist from 1997 to July 2017. He holds Masters of Science and Doctorate of Philosophy degrees in Geology from the University of Delaware, and Bachelors of Science and Masters of Science Degrees in Geology from the University of Nagpur, India. Prior to his present position he served as Director of the Basin Research Institute of Louisiana State University, which is now the Basin Research Energy Section of the LGS.

John joined the LGS in 1987 and subsequently held the positions of Assistant Professor Research, Associate Professor Research, Chief, Energy and Mineral Resources Section of BRI, and Director of Research before being appointed as Director and State Geologist in 1997. He has previously served as an advanced geologist with Marathon Oil Company, as a senior exploration geologist with Geo Consultants International, and as geologist-in-charge of the Akula Clay mine with English India Clays Ltd.

John is a member of many professional associations and has served as president of the Louisiana Section of the American Institute of Professional Geologists, the Energy Minerals Division of the American Association of Petroleum Geologists, the Gulf Coast Association of Geological Societies, and the Baton Rouge Geological Society. He was elected as a Fellow of the Geological Society of America in 2004, has been a recipient of professional society awards, and is the author and/or co-author of numerous technical reports, book chapters, professional presentations and journal publications.

His fields of research specialization are petroleum geology, sedimentology, reservoir characterization, depositional environments and models of clastic sandstone reservoirs, geopressured-geothermal energy resources, coastal geomorphology and environmental geology.

Chacko J. John, PhD projects


Marty Horn, PhD
Acting Assistant Director
Email: mhorn@lsu.edu
Telephone: 225-578-2681
Marty Horn joined the Louisiana Geological Survey as an assistant professor of research in January 2007. He had previously been employed at LSU since 2002 as an instructor in the LSU Department of Geology and Geophysics, where he also served as the field camp director. Horn earned a Bachelors of Science in Geophysics at the University of Oklahoma in 1982, an Masters of Science in Geology at the Arizona State University in 1986, and a Doctorate of Philosophy in Mathematical Sciences & Geology at the University of Texas at Arlington in 1996. After graduation he taught courses in Mineralogy, Petrology, Volcanology, and Field Geology at University of Texas at Arlington as an adjunct professor. While at University of Texas at Arlington Horn also worked as a geologist for Snyder Oil Company, where he primarily focused on the Hosston and Cotton Valley trends of north Louisiana. At the LGS he has returned to full time research on north Louisiana oil and gas reserves.

Marty Horn, PhD projects


Melissa Esnault
Office Coordinator
Email: mesnau1@lsu.edu
Telephone: 225-578-5320
Melissa Esnault is the Office Coordinator of the LGS. She graduated from Louisiana Tech University in Ruston, Louisiana, in 2000 with a Bachelors of Science degree in Family Studies with a concentration in Early Childhood Development. Melissa joined LSU in 2007 as a Coordinator in LSU’s Office of Human Resources, where she was the assistant to the associate vice chancellor of Human Resource Management. She was previously employed as an inside sales representative by the Tembec Paper Corporation in St Francisville, Louisiana and as an executive administrative assistant by the eFederal Credit Union in Baton Rouge. Melissa joined the LGS in 2010.


Jeanne Johnson
Accounting Technician
Email: jeannej@lsu.edu
Telephone: 225-578-8407
Jeanne Johnson is the Accounting Technician for the Louisiana Geological Survey and handles all LGS grants, contracts and budgets. Johnson came to work at LSU in 1991 and has worked for the Department of Oceanography and Coastal Sciences, the Coastal Studies Institute and the School of Veterinary Medicine. Jeanne assists LGS researchers in the preparation of their proposal budgets and provides the staff with their respective monthly budget summaries.


Patrick O’Neill
Research Associate 3
Email: poneil2@lsu.edu
Telephone: 225-578-8590

Patrick O’Neill received a Bachelors of Science degree from the LSU School of Forestry in 1985 and worked in photogrammetry before joining the LGS. Pat is in charge of LGS Publications Office as well as the LGS core and well log libraries and facilities. He has experience with Global Positioning System data collection and related field work techniques.