Academic Appointments


  • Physical Science Research Scientist, Mechanical Engineering

Professional Education


  • MS, Stanford University, Mechanical Engineering (2020)
  • BS, The Pennsylvania State University, Nuclear Engineering (2018)

Current Research and Scholarly Interests


Laser diagnostics development for combustion applications

All Publications


  • Simultaneous OH and OH* measurements during NH<sub>3</sub> oxidation in a shock tube PROCEEDINGS OF THE COMBUSTION INSTITUTE Clees, S., Rault, T. M., Zaczek, L. T., Hanson, R. K. 2024; 40 (1-4)
  • Multi-speciation and ignition delay time measurements of ammonia oxidation behind reflected shock waves COMBUSTION AND FLAME Rault, T. M., Clees, S., Figueroa-Labastida, M., Barnes, S. C., Ferris, A. M., Obrecht, N., Callu, C., Hanson, R. K. 2024; 260
  • Low-temperature oxidation of n-octane and n-decane in shock tubes: Differences in time histories of key intermediates COMBUSTION AND FLAME Choudhary, R., Clees, S., Boddapati, V., Shao, J., Davidson, D. F., Hanson, R. K. 2023; 251
  • A laser-absorption sensor for in situ detection of biofuel blend vapor in engine intakes PROCEEDINGS OF THE COMBUSTION INSTITUTE Clees, S., Cha, D. H., Biswas, P., Boddapati, V., Cassady, S. J., Strand, C. L., Hanson, R. K., French, B., Gilmour, A., Hawk, K. C., Stitt, J. M., Ferlet, X. 2023; 39 (1): 1307-1316
  • Shock tube study of ethanol pyrolysis II: Rate constant measurements and modeling COMBUSTION AND FLAME Choudhary, R., Boddapati, V., Clees, S., Girard, J. J., Peng, Y., Shao, J., Davidson, D. F., Hanson, R. K. 2021; 233
  • Shock tube study of ethanol pyrolysis I: Multi-species time-history measurements COMBUSTION AND FLAME Choudhary, R., Boddapati, V., Clees, S., Girard, J. J., Peng, Y., Shao, J., Davidson, D. F., Hanson, R. K. 2021; 233
  • Measurement of time histories of stable intermediates during first stage ignition of n-heptane and its two isomers in a shock tube PROCEEDINGS OF THE COMBUSTION INSTITUTE Choudhary, R., Girard, J. J., Clees, S., Johnson, S. E., Shao, J., Davidson, D. F., Hanson, R. K., Aradi, A. A. 2021; 38 (1): 957-965
  • ROLE OF TURBULENCE IN PRECESSING VORTEX CORE DYNAMICS Karmarkar, A., Frederick, M., Clees, S., Mason, D., O'Connor, J., ASME AMER SOC MECHANICAL ENGINEERS. 2019