I am a part time visiting scientist at Berkeley Center for Cosmological Physics. I develop and maintain the software stack that supports research in Cosmology.
I develop a lot of software packages, and contributes to many more. Most of these can be found at my github page. In earlier days I was involved with GNOME2 with a sideline project gnomeglobalmenu; I do not think many people still use it; as the features have been partially included in GNOME3 and Ubuntu Unity.
My work in cosmolgoy spans three fields:
massively parallel supercomputing applications, and
methods and software tools for data analysis;
Please refer to my list of publications.
Here is a list of research topics and projects that I have contributed to:

Cosmology

Supercomputing Applications

Software and methods for data analysis
I was part of several largest cosmological simulations. These simulations required some of the largest supercomputers today(or then), running at their full capability for days; that's hundreds of millions of CPUhours. We do make important predictions about blackholes and galaxies with these simulations.
 1

Highredshift supermassive black holes: accretion through cold flows. http://adsabs.harvard.edu/abs/2014MNRAS.440.1865F
 2

Cold Flows and the First Quasars. http://adsabs.harvard.edu/abs/2012ApJ...745L..29D
 3

The MassiveBlackII simulation: the evolution of haloes and galaxies to z ˜ 0 . http://adsabs.harvard.edu/abs/2015MNRAS.450.1349K
 4

The Formation of Milky Way–mass Disk Galaxies in the First 500 Million Years of a Cold Dark Matter Universe. http://adsabs.harvard.edu/abs/2015ApJ...808L..17F
 5

Mock QuasarLymanα forest datasets for the SDSSIII Baryon Oscillation Spectroscopic Survey. http://adsabs.harvard.edu/abs/2015JCAP...05..060B
 6

Intrinsic alignments of galaxies in the MassiveBlackII simulation: analysis of twopoint statistics. http://adsabs.harvard.edu/abs/2015MNRAS.448.3522T
 7

Eulerian BAO Reconstructions and NPoint Statistics. http://adsabs.harvard.edu/abs/2015arXiv150806972S
 8

Perturbation theory, effective field theory, and oscillations in the power spectrum http://adsabs.harvard.edu/abs/2015arXiv150902120V
 9
 10

Python binding of a library for massively Parallel Fast Fourier Transform (PFFT). http://github.com/rainwoodman/pfftpython
 11

A library for parallel histogram sort with a Python binding. https://github.com/rainwoodman/MPsort
 12

Boosting python startup speed with MPI. https://github.com/rainwoodman/pythonmpibcast
 13

Parallel Data Analysis for Nbody simulations. http://github.com/bccp/nbodykit
 14

Spatial data with a KDtree. http://github.com/rainwoodman/kdcount
 15

Scipy cKDTree rewrite (pending, https://github.com/sturlamolden/scipy/pull/1)
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 18

A pure particle mesh solver. http://github.com/rainwoodman/fastpm
 19

Hierarchy Data Files. http://github.com/rainwoodman/bigfile
 20

A simple autodiff and a small library of operators. http://github.com/rainwoodman/vmad
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(ABstract OPTimizer)  optimization of generic numerical models. http://github.com/bccp/abopt
 22