Steven Glenn Johnson (born 1973)[2] is an American applied mathematician and physicist known for being a co-creator of the FFTW[3][4][5] library for software-based fast Fourier transforms and for his work on photonic crystals.
He is professor of Applied Mathematics and Physics at MIT where he leads a group on Nanostructures and Computation.
[6] While working on his PhD at MIT, he developed the Fastest Fourier Transform in the West (FFTW) library[3] with funding from the DoD NDSEG Fellowship.
[7] Steven Johnson and his colleague Matteo Frigo were awarded the 1999 J. H. Wilkinson Prize for Numerical Software for this work.
[8][9] He is the author of the NLOpt library for nonlinear optimization,[10] as well as being the co-author of the open-source electromagnetic softwares Meep[11] and MPB.