Ph.D, Aerospace Engineering, University of Texas at Austin, August 1988.Joint Center for Space Research since 1983.Research Experience in satellite dynamics and geodesy for gravity and earth rotation.Recent published Papers:Decadal variation in Earth’s oblateness (J2) from satellite laser ranging data, Geophys. J. Int. 2018, 212(2), 1218–1224, DOI: 10.1093/gji/ggx483.(Cheng, M.K., and J. C. Ries ).The unexpected signal in GRACE estimates of C20, J. Geodesy, 2017, DOI: 10.1007/s00190-016-0995-5 (M.K. Cheng and J. C. Ries) Deceleration in the Earth’s oblateness, J. Geophys. Res., 2012, DOI: 10.1002/jgrb.50058 (M. K. Cheng, J. C. Ries, B. D. Tapley).