Contact Information

Preventive Medicine and Biometrics: Faculty

Uniformed Services University of the Health Sciences
Department of Preventive Medicine and Biometrics
4301 Jones Bridge Road
Bethesda, Maryland 20814-4799
Office Location: AFRRI, 3176J
Phone: (301) 319-6952

Anthony R. Artino, Commander, Medical Service Corps, U.S. Navy, Associate Professor, Department of Preventive Medicine and Biometrics

Christopher A. Gellasch

Lieutenant Colonel, Medical Service Corps, U.S. Army
Assistant Professor


Lieutenant Colonel Christopher A. Gellasch is an Army Environmental Science and Engineering Officer that has served in a variety of field and fixed facility assignments. He taught environmental science and engineering courses at the U.S. Military Academy (West Point) as an assistant professor. As the commander of the 71st Medical Detachment (Preventive Medicine) he deployed to Afghanistan in support of Operation Enduring Freedom VI. During that deployment he also traveled to Pakistan and supported Task Force Quake during earthquake relief operations in October 2005. His most recent military assignment before coming to USUHS was as the Chief, Environmental Health Engineering Division at the U.S. Army Center for Health Promotion and Preventive Medicine – West located at Fort Lewis, WA.


  • Ph.D., Geology with Environmental Engineering minor, University of Wisconsin – Madison
  • M.S., Geological Sciences, Indiana University
  • B.S., Geology, Eastern Michigan University


LTC Gellasch is a geologist with a focus on groundwater (hydrogeology) and water quality. His research combines aspects of hydrogeology and environmental engineering to determine the most likely pathways for sewer derived wastewater contaminants to migrate through the subsurface and impact public supply wells. In addition to traditional chemical wastewater indicators, he utilizes human enteric viruses as spatial and temporal tracers to delineate groundwater flow pathways. The effect of public supply well pumping on the surrounding aquifer is also used to determine vulnerability to wastewater contaminants entering a drinking water system.

Another of LTC Gellasch's research areas is the application of hydrogeology during military operations in order to evaluate the quantity and quality of water supplies used by deployed forces and local populations.


  • Introduction to Environmental Health
  • Advanced Environmental Health
  • Air Pollution and Waste Management
  • Hydrology, Water Treatment, and Wastewater Treatment
  • Environmental and Occupational Health Journal Club

Areas of Expertise

  • Environmental science
  • Environmental health
  • Chemical and microbiological drinking water contaminants
  • Groundwater contamination
  • Military hydrogeology

Selected Recent Publications

Gellasch, C.A., H.F. Wang, K.R. Bradbury, J.M. Bahr, and L.L. Lande. 2014. Reverse Water-Level Fluctuations Associated with Fracture Connectivity. Groundwater v. 52 no. 1, p. 105-117 DOI: 10.1111/gwat.12040

Gellasch, C.A., K.R. Bradbury, D.J. Hart, and J.M. Bahr. 2013. Characterization of fracture connectivity in a siliciclastic bedrock aquifer near a public supply well (Wisconsin, USA). Hydrogeology Journal v. 21 no. 2, p. 383-399. DOI: 10.1007/s10040-012-0914-7

Gellasch, C.A. 2012, Hydrogeological support to United States military operations, 1917-2010. In: Rose, E. P. F. & Mather, J. D. (eds) Military Aspects of Hydrogeology. Geological Society of London Special Publication 362, p. 223-239, DOI: 10.1144/SP362.12.

Professional Activities

  • Registered Environmental Health Specialist, National Environmental Health Association
  • Licensed Professional Geologist, State of Indiana
  • Certified Professional Geologist, American Institute of Professional Geologists
  • Geological Society of America
    • Technical Program Chair for Hydrogeology Division, 2014-2015
    • Academic and Applied Geoscience Relations Committee, 2011-2014
    • Committee on Professional Development, 2006-2009
    • Geology in Government Mentor Program, 2007 and 2008
  • Peer reviewer for Journal of Hydrology and Environmental Science and Technology