Vice-President, AeroSurvey, Inc., 1993-present

• Kansas State University, 1994
  Doctor of Philosophy, Analytical Chemistry
  Dissertation: "Practical Applications of Open-Path Fourier Transform Infrared Spectrometry and Classical Least Squares Automated Spectral Interpretation Routines for Atmospheric Monitoring"
  Research Co-Advisors: University Distinguished Professor William G. Fateley and Professor Robert M. Hammaker
  
  
• Northeast Missouri State University, 1988
  B.SC., Chemistry

• "Passive Infrared Spectral Measurements for a Controlled Open-Air Genreation of Methanol and Ethanol Vapor Mixtures", Roger J. Combs, Robert B. Knapp, Robert T. Kroutil, Charles T. Chaffin, Timothy L. Marshall; ECBC-TR-213, a publication of Edgewood Chemical and Biological Center (2001).
  
  
• "Methanol Passive FT-IR Spectrometery Results Using Controlled Open-Air Vapor Generation", Roger J. Combs, Robert B. Knapp, Robert T. Kroutil, Charles T. Chaffin, Timothy L. Marshall; ECBC-TR-200, a publication of Edgewood Chemical and Biological Center (2001).
  
  
• "Ethanol Passive FT-IR Spectrometery Results Using Controlled Open-Air Vapor Generation", Roger J. Combs, Robert B. Knapp, Robert T. Kroutil, Charles T. Chaffin, Timothy L. Marshall; ECBC-TR-199, a publication of Edgewood Chemical and Biological Center (2001).
  
  
• "Passive FT-IR Remote Sensing of Smokestack Emissions", C.T. Chaffin, T.L. Marshall, N.C. Chaffin; Field Analytical Chemistry and Technology 3(2): 111-115 (1999).
  
  
• "FT-IR Air Analysis in Environmental Applications", Charles T. Chaffin, Jr. and Timothy L. Marshall, Encyclopedia of Environmental Analysis and Remediation, Robert A. Myers, Ed., John Wiley and Sons (1998).
  
  
• "Generating Well-Characterized Chemical Plumes for Remote Sensing Research", Charles T. Chaffin, Jr. and Timothy L. Marshall, Electro-Optical Technology for Remote Chemical Detection and Identification III, Ed.'s M. Fallahi and E. Howden, Proceedings of SPIE Volume 3383 (1998).
  
  
• "Design, Construction, and Performance Testing of a Plume Generator for Remote Sensing Research", C.T. Chaffin, T.L. Marshall, ERDEC-CR-261, a publication of Edgewood Research Development & Engineering Center under the U.S.Army Chemical and Biological Defense Command (1998).
  
  
• "Infrared Analysis of Volcanic Plumes: A Case Study in the Application of Open-Path FT-IR Monitoring Techniques", C.T. Chaffin, T.L Marshall, W.G. Fateley, R.M. Hammaker, Spectroscopy Europe, 7/3, 18-24 (1995).
  
  
• "A Discussion of Passive FT-IR Data Collection and Reduction Strategies: Examples of Recent Applications", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, Proceeedings of the Fourth International Symposium on Field Screening Methods for Hazardous Wastes and Toxic Chemicals, Las Vegas, NV, February 22-24, 1995
  
  
• "Passive FT-IR for Atmospheric Assessment of Volatile Organic Compounds (VOCs)", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, Proceeedings of the Fourth International Symposium on Field Screening Methods for Hazardous Wastes and Toxic Chemicals, Las Vegas, NV, February 22-24, 1995. (A&WMA Proceedings to be published)
  
  
• "Monitoring Petroleum Hydrocarbons at a Gasoline Station by Extractive Fourier Transform Infrared (FT-IR) Spectrometry", T.L. Marshall, C.T. Chaffin, R.M. Hoffman, R.M. Hammaker, W.G. Fateley, Proceedings of the International Forum on Process and Analytical Chemistry, Houston, TX, January 24-26, 1995.
  
  
• "The Assessment of Indoor Air Quality Using Extractive Fourier Transform Infrared (FT-IR) Measurements", C.T. Chaffin, T.L. Marshall, P.T. Jaakkola, J.K. Kauppinen, R.M. Hammaker, W.G. Fateley, Proceeedings of the A&WMA International Symposium on Optical Sensing for Environmental and Process Monitoring, McLean, VA, November 7- 10, 1994.
  
  
• "Passive Monitoring of SO2 from a Smoke Stack using Open-Path FT-IR: A Comparison of Emission Spectra from an Actual Hot Plume to Emission Spectra from a Heatable Cell", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, Proceeedings of the A&WMA International Symposium on Optical Sensing for Environmental and Process Monitoring, November 7-10, 1994, McLean, VA.
  
  
• "Estimation of VOC Emission Rates from FT-IR Measurements and Whole-Air Canister Data", R.E. Carter, Jr., D.D. Lane, G.A. Marotz, M.F. Davis, J.L. Hudson, C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, Proceeedings of the Conference on Optical Sensing for Environmental and Process Monitoring, November 7-10, 1994, McLean, VA.
  
  
• "Observing Industrial Atmospheric Environments by FT-IR", W.G. Fateley, R.M. Hammaker, M.D. Tucker, M.R. Witkowski, C.T. Chaffin, T.L. Marshall, M. Davis, M. J. Thomas, J. Arello, J.L. Hudson, and B.J. Fairless, J. Molec. Struct, 347 , 153-168, (1995) .
  
  
• "An Introduction to Open-Path FT-IR Atmospheric Monitoring", T.L. Marshall, C.T. Chaffin, R.M. Hammaker and W.G. Fateley, Environ. Sci. Technol., 28, 224A-232A (1994).
  
  
• "FT-IR and Fugitive Emissions", T.L. Marshall, C.T. Chaffin, M.D. Tucker, and W.G. Fateley, Environmental Testing & Analysis, 3(3), 40-48 (1994).
  
  
• "Investigation of the Effects of Resolution on the Performance of Classical Least Squares (CLS) Spectral Interpretation Programs When Applied to Volatile Organic Compounds (VOCs) of Interest using Open-Air Long-Path Fourier Transform Infrared (FT-IR) Spectrometry", T.L. Marshall, C.T. Chaffin, V.D. Makepeace, R.M. Hoffman, R.M. Hammaker, W.G. Fateley, P. Saarinen, and J. Kauppinen, J. Molec. Struct., 301, (1994) (Special issue dedicated to Prof. R. Norman Jones).
  
  
• "Fourier Transform Spectroscopy: From Organizing MISFITS to FT'ing in a Truck," W.G. Fateley, R.M. Hammaker, M.L. Spartz, T.L. Marshall, C.T. Chaffin, V.D. Makepeace, B.J. Fairless, J.L. Hudson, J. Arello, and M.J. Thomas, Proceedings of the 9th International Conference on Fourier Transform Spectroscopy, August 23-27, 1993, SPIE Proceedings 2089 (1993).
  
  
• "What Height for Remote FT-IR Sensing of Volatile Organic Compounds Emitted Near Ground Level?", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, Proceedings of the 86th Annual Meeting and Exposition of the Air & Waste Management Association, Denver, CO, June 14-18, 1993 (1993).
  
  
• "FT-IR Remote Sensing of Industrial Atmospheres For Spatial Characterization", R.M. Hammaker, W.G. Fateley, C.T.Chaffin, T.L.Marshall, M.D.Tucker, V.D. Makepeace, J.M. Poholarz, Appli. Spectrosc., 47(9), 1471-1475, (1993).
  
  
• "Evaluation and Demonstration of Open-Path Fourier Transform Infrared Spectroscopy as a Tool for the In-Situ Measurement of Air Toxics," J.L. Hudson, M.J. Thomas, J. Arello, J.R. Helvig, B.J. Fairless, R.E. Carter, Jr., D.D. Lane G.A. Marotz, M.R. Witkowski, T. Marshall, C. Chaffin, R.M. Hammaker, and W.G. Fateley, Proceedings of A&WMA/U.S. EPA International Symposium on Field Screening Methods for Hazardous Wastes and Toxic Chemicals, Las Vegas, NV, February 24-26, 1993 (1993).
  
  
• "A Method of Predicting Point and Path-Averaged Ambient Air VOC Concentrations, Using Meteorological Data," R.E. Carter, D.D. Lane, G.A. Marotz, C.T.Chaffin, T.L.Marshall, M. Tucker, M.R. Witkowski, R.M. Hammaker, W.G. Fateley, M.J. Thomas, J.L.Hudson, J. Air and Waste Management Association, 43, 480-488 (1993).
  
  
• "Characterizing the Gaseous Emissions from Waste Water Treatment Plants with a Long-Path Fourier Transform Infrared (FT-IR) Spectrometer System," C.T. Chaffin, M.R. Witkowski, T.L. Marshall, R.M. Hammaker, W.G. Fateley, M. Thomas, J. Arello, J.L Hudson, T. Holloway, B.J. Fairless, Proceedings of the Conference on Hazardous Waste Research, University of Colorado, June 1-2, 1992, pp 463-475 (1992).
  
  
• "Field Monitoring of Volatile Organic Compounds (VOC's) with a Mobile Fourier Transform Infrared (FT-IR) Spectrometer System," M.R. Witkowski, T.L. Marshall, C.T. Chaffin, R.M. Hammaker, W.G. Fateley, Proceedings of the A&WMA Conference on Optical Remote Sensing and Applications to Environmental and Industrial Safety Problems, Houston, TX, April 6-8, 1992, pp 157-168 (1992).
  
  
• "Art of Atmospheric Monitoring",W.G. Fateley, M.R. Witkowski, C.T. Chaffin, T.L. Marshall, R.M. Hammaker, R.E. Carter, D.D. Lane, G.A. Marotz, B.J. Fairless, T. Holloway, J.L. Hudson, J. Arello, M. Thomas, D.F. Gurka, Proceedings of the Conference on Environmental and Process Monitoring Technologies, SPIE Proceedings 1637, 50- 61 (1992).
  
  
• "Testing and Development of a Mobile Fourier Transform (FT-IR) Spectrometer System for the Analysis of Atmospheric Pollutants," M.R. Witkowski, C.T. Chaffin, T.L. Marshall, M.L. Spartz, J.H. Fateley, R.M. Hammaker, W.G. Fateley, R.E. Carter, D.D. Lane, G.A. Marotz, B.J. Fairless, J.L. Hudson, J. Arello, M. Thomas, D.F. Gurka, Proceedings of the 8th International Conference on Fourier Transform Spectroscopy, September 1-6, 1991, SPIE Proceedings, 1575, 340-341 (1991).
  
  
• "Increasing the Sensitivity of a Mobile Fourier Transform Infrared (FT-IR) Spectrometer System," M.R. Witkowski, C.T. Chaffin, T.L. Marshall, M.L. Spartz, J.H. Fateley, R.M. Hammaker, W.G. Fateley, R.E. Carter, D.D. Lane, G.A. Marotz, B.J. Fairless, T. Holloway, J.L. Hudson, J. Arello, M. Thomas, D.F. Gurka, Proceedings of the Conference on Hazardous Waste Research, Kansas State University, May 29-30, 1991, pp. 143-152 (1991).
  
  
• "Remote Sensing of Toxic Air Pollutants at a High Risk Point Source Using Open-Path Fourier Transform Infrared Spectroscopy: A Case Study", J.L. Hudson, J. Arello, M.J. Thomas, H.E. Kimball, T.T. Holloway, B.J. Fairless, M.L. Spartz, M.R. Witkowski, T.L. Marshall, C.T. Chaffin, et.al., Proceedings of the 84th Annual Meeting of the Air & Waste Management Association (Vol.2), (1991).
  
  

• "Passive FT-IR for Atmospheric Assessment of Volatile Organic Compounds (VOCs)," C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, The Fourth International Symposium on Field Screening Methods for Hazaardous Wsate and Toxic Chemicals, Las Vegas, NV, February 22-24, 1995.
  
  
• "A Discussion of Passive FT-IR Data Collection and Reduction Strategies: Examples of Recent Applications," C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, The Fourth Internatioal Symposium on Field Screening Methods, Las Vegas, NV, February 22-24, 1995.
  
  
• "The Assessment of Indoor Air Quality Using Extractive Fourier Transform Infrared (FT-IR) Measurements," C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, The A&WMA International Symposium on Optical Sensing for Environmental and Process Monitoring, McLean, VA, November 7-10, 1994.
  
  
• "An Improved Sampling Technique Capable of Producing Quantitative FT-IR Data Using A Passive (Monostatic) Data Collection Approach," W.G. Fateley, C.T. ChaffinT.L. Marshall, M.D. Tucker, R.M. Hammaker, The A&WMA/SPIE Conference on Optical Sensing For Environmental Monitoring; Atlanta, Georgia; October 11-14, 1993.
  
  
• "What Height for Remote FT-IR Sensing of Volatile Organic Compounds Emitted Near Ground Level?", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, The 86th Annual Meeting and Exposition of the Air & Waste Management Association, Denver, CO, June 14-18, 1993.
  
  
• "A Comparison of Open Path FT-IR Data Collected in Both Bistatic and Passive Modes", C.T. Chaffin, T.L. Marshall, R.M. Hammaker, W.G. Fateley, et al.; an invited presentation in the Symposium on Environmental Monitoring with FT-IR Spectroscopy, an Environmental Mini-meeting, arranged by the U.S. Army CRDEC, paper 1142, Pittsburgh Conference and Exposition on Analytical Chemistry, March 8-11, 1993.
  
  
• "Characterizing the Gaseous Emissions from Waste Water Treatment Plants with a Long Path Fourier Transform Infrared Spectrometer System", C.T. Chaffin, M.R. Witkowski, T.L. Marshall, R.M. Hammaker, W.G. Fateley, et al.; The Conference on Hazardous Waste Research, Boulder, CO, June 1-2, 1992.