Throughout more than 30 years at PNNL, Dave Engel has been involved with many aspects of projects—all related to mathematics and statistics. Much of his research and project work has been in the areas of uncertainty quantification and machine learning with special emphasis in the development of diverse project teams to solve problems involving applied mathematics and computational statistics.

Research Interest

  • Uncertainty quantification, sensitivity, and risk analysis in many application areas, including: waste management (storage and deposition); groundwater modeling; carbon capture; cybersecurity; adaptive sampling techniques; response surface modeling; probabilistic risk analysis, including technical risk, financial risk, and technical readiness level
  • Social data analytics (development and analysis) and text analysis (data mining), including anomaly detection and trend analysis; social media analytics, such as group identification and characterization

Disciplines and Skills

  • Computational Mathematics
  • Data Analysis
  • Machine Learning Algorithms
  • Uncertainty Quantification


  • MBA Business Administration, University Washington, 1991
  • BS Mathematics, Central Washington University, 1982

Awards and Recognitions

  • Top Presentation, Annual Conference on Carbon Capture Utilization & Sequestration (2013)
  • Top Paper, IADIS International Conference Web Based Communities and Social Media (2011)
  • Royalty Award, PNNL (1988, 1998, 2013)
  • Outstanding Performance Recognition Award, PNNL (2001, 2002, 2005)



  • Laureanti J.A., J.M. Brandi-Lozano, E.C. Offor, D.W. Engel, R.J. Rallo Moya, B. Ginovska, and X. Martinez, et al. 2020. "Visualizing biomolecular electrostatics in virtual reality with UnityMol-APBS." Protein Science 29, no. 1:237-246. PNNL-SA-146891. doi:10.1002/pro.3773
  • Thayer B.L., D.W. Engel, I. Chakraborty, K.P. Schneider, L. Ponder, and K. Fox. 2020. "Improving End-Use Load Modeling Using Machine Learning and Smart Meter Data." In 53rd Hawaii International Conference on System Sciences (HICSS-53), January 6-10, 2020, Maui, Hawaii, 3055-3064. Honolulu, Hawaii:University of Hawaii. PNNL-SA-144442.  doi:10.24251/HICSS.2020.373


  • Thayer B.L., D.W. Engel, and K.P. Schneider. 2019. "Load Modeling with Smart Meter Data for Advanced Volt-VAR Optimization Applications." In IEEE Power and Energy Society General Meeting (PESGM 2019), August 4-8, 2019, Atlanta, GA, 1-5. Piscataway, New Jersey:IEEE. PNNL-SA-139397. doi:10.1109/PESGM40551.2019.8973489


  • Jurrus E.R., D.W. Engel, K.T. Star, K.E. Monson, J.M. Brandi-Lozano, L. Felberg, and D.H. Brookes, et al. 2018. "Improvements to the APBS biomolecular solvation software suite." Protein Science 27, no. 1:112-128. PNNL-SA-127254. doi:10.1002/pro.3280


  • Li W., J. Lian, D.W. Engel, and H. Wang. 2017. "Ensemble-Based Uncertainty Quantification for Coordination and Control of Thermostatically Controlled Loads." Journal of Control and Decision 5, no. 2:148-168. PNNL-SA-123683. doi:10.1080/23307706.2017.1353931


  • Engel D.W., T.A. Reichardt, T.J. Kulp, D. Graff, and S.E. Thompson. 2016. "Hierarchical Multi-Scale Approach To Validation and Uncertainty Quantification of Hyper-Spectral Image Modeling." In Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXII, April 17, Baltimore, Maryland. Proceedings of the SPIE, edited by M Velez-Reyes and DM Messinger, 9840, Paper No. 98400N. Bellingham, Washington:SPIE. PNNL-SA-117473.  doi:10.1117/12.2224262



  • Engel D.W., A.C. Dalton, C. Dale, J. Thompson, R. Leclaire, B. Edward, and E. Jones. 2014. "Development of a Risk-Based Comparison Methodology of Carbon Capture Technologies." Greenhouse Gases: Science and Technology 4, no. 3:316-330. PNNL-SA-98559. doi:10.1002/ghg.1422
  • Engel D.W., and A.C. Dalton. 2014. TRL Computer System User's Guide. PNNL-23149. Richland, WA: Pacific Northwest National Laboratory. 
  • Fang Z., Z. Hou, G. Lin, D.W. Engel, Y. Fang, and P.W. Eslinger. 2014. "Exploring the effects of data quality, data worth, and redundancy of CO2 gas pressure and saturation data on reservoir characterization through PEST Inversion." Environmental Earth Sciences 71, no. 7:3025-3037. PNNL-SA-88296. doi:10.1007/s12665-013-2680-9
  • Hou Z., D.H. Bacon, D.W. Engel, G. Lin, Y. Fang, H. Ren, and Z. Fang. 2014. "Uncertainty analyses of CO2 plume expansion subsequent to wellbore CO2 leakage into aquifers." International Journal of Greenhouse Gas Control 27. PNNL-SA-94280. doi:10.1016/j.ijggc.2014.05.004
  • Miller D., M. Syamlal, D. Mebane, C. Storlie, D. Bhattacharyya, N.V. Sahinidis, and D.A. Agarwal, et al. 2014. "Carbon Capture Simulation Initiative: A Case Study in Multi-Scale Modeling and New Challenges." Annual Review of Chemical and Biomolecular Engineering 5. PNNL-SA-98982. doi:10.1146/annurev-chembioeng-060713-040321


  • Engel D.W., A.C. Dalton, C. Dale, and E. Jones. 2013. "Risk-Based Comparison of Carbon Capture Technologies." In 12th Annual Conference on Carbon Capture Utilization & Sequestration, May 13-16, 2013, Pittsburgh, Pennsylvania. Washington Dc:Carbon Capture Simulation Initiative (CCSI). PNNL-SA-95694. 
  • Engel D.W., A.C. Dalton, C. Dale, E. Jones, and J. Thompson. 2013. Risk Analysis and Decision Making FY 2013 Milestone Report. PNNL-22563. Richland, WA: Pacific Northwest National Laboratory. 
  • Engel D.W., A.C. Dalton, C. Sivaramakrishnan, and C. Lansing. 2013. CCSI Technology Readiness Levels Likelihood Model (TRL-LM) User's Guide. PNNL-22374. Richland, WA: Pacific Northwest National Laboratory. 
  • Hou Z., D.W. Engel, G. Lin, Y. Fang, and Z. Fang. 2013. "An Uncertainty Quantification Framework for Studying the Effect of Spatial Heterogeneity in Reservoir Permeability on CO2 Sequestration." Mathematical Geosciences 45, no. 7:799-817. PNNL-SA-85209. doi:10.1007/s11004-013-9459-0


  • Bell E.B., E.J. Marshall, R.E. Hull, A.K. Fligg, A.P. Sanfilippo, D.S. Daly, and D.W. Engel. 2012. "Classifying Scientific Performance on a Metric-by-Metric Basis." In Proceedings of the Twenty-Fifth International Florida Artificial Intelligence Research Society (FLAIRS) Conference, May 23-25, 2012, Marco Island, Florida, edited by GM Youndblood and PM McCarthy, 400-403. Palo Alto, California:AAAI Press. PNWD-SA-9767. 
  • Engel D.W. 2012. Initial Decision and Risk Analysis. PNNL-21182. Richland, WA: Pacific Northwest National Laboratory. 
  • Engel D.W. 2012. Initial Risk Analysis and Decision Making Framework. PNNL-20932. Richland, WA: Pacific Northwest National Laboratory. 
  • Engel D.W., A.C. Dalton, K.K. Anderson, C. Sivaramakrishnan, and C. Lansing. 2012. Development of Technology Readiness Level (TRL) Metrics and Risk Measures. PNNL-21737. Richland, WA: Pacific Northwest National Laboratory. 
  • Engel D.W., and A.C. Dalton. 2012. CCSI Risk Estimation: An Application of Expert Elicitation. PNNL-21785. Richland, WA: Pacific Northwest National Laboratory. 
  • Engel D.W., B. Letellier, B. Edwards, R. Leclaire, and E. Jones. 2012. "New Technical Risk Management Development for Carbon Capture Process." In Proceedings of the 11th Annual Conference on Carbon Capture Utilization and Sequestration, April 30-May 3, 2012, Pittsburgh, PA. Pittsburgh, Pennsylvania:CCSI. PNNL-SA-87545. 
  • Engel D.W., M.L. Gregory, E.B. Bell, and L.R. McGrath. 2012. "IDENTIFYING ON-LINE GROUPS BASED ON CONTENT AND COLLECTIVE BEHAVIORAL PATTERNS." In IADIS International Conference Web Based Communities and Social Media, July 22-24, 2011, Rome, Italy. N.P.:IADIS Press. PNNL-SA-79593. 
  • Gregory M.L., D.W. Engel, E.B. Bell, and L.R. Mcgrath. 2012. "Identifying Differences in Cultural Behavior in Online Groups." In Advances in Design for Cross-Cultural Activities Part II, edited by DD Schmorrow. 283-292. Boca Raton, Florida:CRC Press. PNNL-SA-89341. 
  • Lin G., D.W. Engel, and P.W. Eslinger. 2012. Survey and Evaluate Uncertainty Quantification Methodologies. PNNL-20914. Richland, WA: Pacific Northwest National Laboratory. 


  • Gregory M.L., D.W. Engel, E.B. Bell, A.W. Piatt, S.T. Dowson, and A.J. Cowell. 2011. "Automatically Identifying Groups Based on Content and Collective Behavioral Patterns of Group Members." In Proceedings of the Fifth International Conference on Weblogs and Social Media, July 17-21, 2011, Barcelona, Spain, 498-501. Palo Alto, California:AAAI Press. PNNL-SA-78096. 
  • Miller D., M. Syamlal, J. Meza, D.L. Brown, M.M. Fox, M.A. Khaleel, and R.K. Cottrell, et al. 2011. "Overview of the U.S. DOE's Carbon Capture Simulation Initiative for Accelerating the Commercialization of CCS Technology." In Proceedings of the 36th International Technical Conference on Clean Coal & Fuel Systems, June 5 - 9, 2011, Clearwater, FL, Paper No. LLNL-CONF-482753. Washington Dc, District Of Columbia:US Department of Energy. PNNL-SA-79707. 


  • Engel D.W., P.D. Whitney, and N.O. Cramer. 2010. "Events and Trends in Text Streams." In Text Mining: Applications and Theory, edited by MW Berry and J Kogan. 165-182. Chichester:John Wiley & Sons, Ltd. PNNL-SA-67443. 
  • Rose S.J., D.W. Engel, N.O. Cramer, and W.E. Cowley. 2010. "Automatic Keyword Extraction from Individual Documents." In Text Mining: Application and Theory, edited by MWBerry, J Kogan. 3-20. Chichester:John Wiley & Sons. PNNL-SA-67401. 
  • Rose S.J., F.J. Brockman, M.L. Hart, D.W. Engel, N.B. Valentine, and A.J. Calapristi. 2010. Morphing Terminology Study. PNNL-19493. Richland, WA: Pacific Northwest National Laboratory. 


  • Engel D.W., P.D. Whitney, A.J. Calapristi, and F.J. Brockman. 2009. "Mining for Emerging Technologies within Text Streams and Documents." In Society for Industrial and Applied Mathematics - 9th SIAM International Conference on Data Mining 2009: Proceedings in Applied Mathematics, 3, 1291-1301. Philadelphia, Pennsylvania:SIAM. PNNL-SA-64618. 
  • Schneider K.P., Y. Chen, D.W. Engel, and D.P. Chassin. 2009. "A Taxonomy of North American Radial Distribution Feeders." In IEEE Power & Energy Society General Meeting (PES '09), July 26-30, 2009, Calgary, Alberta, Canada. Piscataway, New Jersey:IEEE. PNNL-SA-65638.  doi:10.1109/PES.2009.5275900
  • Whitney P.D., D.W. Engel, and N.O. Cramer. 2009. "Mining for Surprise Events within Text Streams." In Proceedings of the SIAM International Conference on Data Mining (SDM 2009), 1, 617-627. Philadelphia, Pennsylvania:Society for Industrial and Applied Mathematics. PNNL-SA-62929. 




  • Scott M.J., C.A. Brandt, A.L. Bunn, D.W. Engel, P.W. Eslinger, T.B. Miley, and B.A. Napier, et al. 2005. "Modeling long-term risk to environmental and human systems at the Hanford Nuclear Reservation: Scope and findings from the initial model." Environmental Management 35, no. 1:84-98. PNNL-SA-37678. 


  • Engel D.W., A.M. Liebetrau, K.D. Jarman, T.A. Ferryman, T.D. Scheibe, and B.T. Didier. 2004. "An Iterative Uncertainty Assessment Technique for Environmental Modeling." In The joint proceedings of the sixth International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences and the fifteenth annual conference of TIES, the International Environmetrics Society Portland, Maine, USA, June 28-July 1, 2004, edited by H. Todd Mowrer, Ronald E. McRoberts, and Paul C. VanDeusen, 8 pages. Washington, District Of Columbia:USDA Forest Service. PNNL-SA-43990. 
  • Eslinger P.W., T.B. Miley, D.W. Engel, W.E. Nichols, L.H. Gerhardstein, D.L. Strenge, and C.A. Lopresti, et al. 2004. User Instructions for the Systems Assessment Capability, Rev. 1, Computer Codes Volume 1: Inventory, Release, and Transport Modules. PNNL-14852 Volume 1. Richland, WA: Pacific Northwest National Laboratory. 


  • Eslinger P.W., D.W. Engel, L.H. Gerhardstein, C.A. Lopresti, W.E. Nichols, and D.L. Strenge. 2002. User Instructions for the Systems Assessment Capability, Rev. 0, Computer Codes Volume 1: Inventory, Release, and Transport Modules. PNNL-13932. Richland, WA: Pacific Northwest National Laboratory. 
  • Kincaid C.T., P.W. Eslinger, D.W. Engel, W.E. Nichols, R.W. Bryce, and A.L. Bunn. 2002. "A Stochastic Assessment of Nuclear Waste Management Practices at the Hanford Site, Washington." In Scientific basis for nuclear waste management XXV : symposium held November 26-29, 2001, Boston, Massachusetts, U.S.A. / Materials Research Society Symposium Proceedings., edited by BP McGrail, G.A. Cragnolino, 713, 275-283. Warrendale, Pennsylvania:Materials Research Society. PNNL-SA-35580. 


  • Scott M.J., R.D. Sands, J.A. Edmonds, A.M. Liebetrau, and D.W. Engel. 2000. "Uncertainty in Integrated Assessment Models: Modeling with MiniCAM 1.0." Energy Policy 27, no. 14:855-879. PNNL-SA-29505.