Fadil Santosa

Fadil Santosa is a professor of applied mathematics and statistics at Johns Hopkins University, where he is currently the Yu Wu and Chaomei Chen Department Head. ^[1] Before, he was a professor at the University of Minnesota.

At the University of Minnesota he was director of the Minnesota Center for Industrial Mathematics, and later director of the Institute for Mathematics and its Applications (IMA) from 2008 to 2017. ^[2]

Santosa is a Fellow of the American Mathematical Society ^[3] and the Society for Industrial and Applied Mathematics (SIAM). ^[4]

Santosa has been recognized with the 2023 SIAM Prize for Distinguished Service to the Profession. ^[5] He also received the 2023 Johns Hopkins Diversity Award. ^[6]

Santosa is known for his work in applied mathematics (detailed below) and his efforts to connect academia and industry, which, in addition to the leadership roles mentioned earlier, include co-authoring a guide for mathematicians on finding careers in business, industry, and government. ^[7]

Santosa holds two patents: for multifocal optical device design and for symbol-based decoding of optical codes. ^[8]

Research

Santosa's research interests include inverse problems, wave phenomena in complex media, photonic devices, and optimal design. His research includes foundational work on using L¹ optimization to find sparse solutions to inverse problems, with a 1986 paper ^[9] now seen as a precursor to methods like compressed sensing and LASSO. ^[10]

Santosa was also one of the first to apply the level-set method to structural optimization and inverse scattering problems. ^[11]

His PhD advisor was Robert W. Carroll. ^[12] Santosa was born in Bandung, Indonesia. ^[13]

Selected publications

Books

• BIG Jobs Guide: Business, Industry, and Government Careers for Mathematical Scientists, Statisticians, and Operations Researchers (2018), with Rachel Levy and Richard Laugesen. ^[7]

• The Princeton Companion to Applied Mathematics (2015), co-edited with Nicholas J. Higham, Mark R. Dennis, Paul Glendinning, Paul A. Martin, and Jared Tanner. ^[14]

• Analysis of Least-Squares Velocity Inversion (1989), with William W. Symes and Raymon L. Brown. ^[15]

Journal articles

• Li, Yuying; Santosa, Fadil (1996). "A computational algorithm for minimizing total variation in image restoration". IEEE Transactions on Image Processing. 5 (6): 987–995. ^[16]

• Santosa, Fadil; Symes, William W. (1986). "Linear inversion of band-limited reflection seismograms". SIAM Journal on Scientific and Statistical Computing. 7 (4): 1307–1330. doi:10.1137/0907087. ^[17]

• Osher, Stanley J.; Santosa, Fadil (2001). "Level set methods for optimization problems involving geometry and constraints: I. Frequencies of a two-density inhomogeneous drum". Journal of Computational Physics. 171 (1): 272–288. ^[11]

• Rondi, Luca; Santosa, Fadil (2001). "Enhanced electrical impedance tomography via the Mumford–Shah functional". ESAIM: Control, Optimisation and Calculus of Variations. 6: 517–538. doi:10.1051/cocv:2001121. ^[18]

References

1. "Fadil Santosa". Johns Hopkins Whiting School of Engineering. Retrieved August 3, 2025.
2. "Former Directors". Institute for Mathematics and its Applications. University of Minnesota. Retrieved August 3, 2025.
3. "Fellows of the American Mathematical Society". American Mathematical Society. Retrieved August 3, 2025.
4. "Fellows Directory". Society for Industrial and Applied Mathematics. Retrieved August 3, 2025.
5. "Prize History". Society for Industrial and Applied Mathematics. Retrieved August 3, 2025.
6. "2023 Diversity Recognition Awards" (PDF). Johns Hopkins University. 2023. Retrieved August 3, 2025.
7. Levy, Rachel; Laugesen, Richard; Santosa, Fadil (2018). BIG Jobs Guide: Business, Industry, and Government Careers for Mathematical Scientists, Statisticians, and Operations Researchers. Society for Industrial and Applied Mathematics. doi:10.1137/1.9781611975291. ISBN   978-1-61197-528-4.
8. "Patents search for Fadil Santosa". Justia Patents. Justia. Retrieved August 3, 2025.
9. Santosa, Fadil; Symes, William W. (1986). "Linear inversion of band-limited reflection seismograms". SIAM Journal on Scientific and Statistical Computing. 7 (4): 1307–1330. doi:10.1137/0907087.
10. Tibshirani, Robert (1996). "Regression Shrinkage and Selection Via the Lasso". Journal of the Royal Statistical Society, Series B (Methodological). 58 (1): 267–288. JSTOR   2346178.
11. Osher, Stanley J.; Santosa, Fadil (2001). "Level set methods for optimization problems involving geometry and constraints: I. Frequencies of a two-density inhomogeneous drum". Journal of Computational Physics. 171 (1): 272–288. Bibcode:2001JCoPh.171..272O. doi:10.1006/jcph.2001.6789.
12. "Fadil Santosa". The Mathematics Genealogy Project. North Dakota State University. Retrieved August 3, 2025.
13. "Fadil Santosa Curriculum Vitae" (PDF). Johns Hopkins University. Retrieved September 20, 2025.
14. Higham, Nicholas J.; Dennis, Mark R.; Glendinning, Paul; Martin, Paul A.; Santosa, Fadil; Tanner, Jared, eds. (2015). The Princeton Companion to Applied Mathematics. Princeton University Press. doi:10.1515/9781400874477. ISBN   978-0-691-15039-0.
15. Santosa, Fadil; Symes, William W.; Brown, Raymon L. (1989). An Analysis of Least-Squares Velocity Inversion. Geophysical Monograph Series. Vol. 4. Society of Exploration Geophysicists. doi:10.1190/1.9781560802488. ISBN   978-0-931830-78-5.
16. Li, Yuying; Santosa, Fadil (1996). "A computational algorithm for minimizing total variation in image restoration". IEEE Transactions on Image Processing. 5 (6): 987–995. Bibcode:1996ITIP....5..987L. doi:10.1109/83.503914. PMID   18285186.
17. Santosa, Fadil; Symes, William W. (1986). "Linear inversion of band-limited reflection seismograms". SIAM Journal on Scientific and Statistical Computing. 7 (4): 1307–1330. doi:10.1137/0907087.
18. Rondi, Luca; Santosa, Fadil (2001). "Enhanced electrical impedance tomography via the Mumford–Shah functional". ESAIM: Control, Optimisation and Calculus of Variations. 6: 517–538. doi:10.1051/cocv:2001121. hdl: 2434/658558 .