[2] Das held postdoctoral positions at Massachusetts Institute of Technology, was a research scientist at Gulf Oil, and a fellow at Columbia at University.
In 1983 she became a senior research scientist at Lamont-Doherty Geological Observatory, a position she held until 1990.
Starting in 1990 she held positions at Oxford University, where she transitioned to emeritus professor in 2013.
[12][13] Das developed a method to invert seismograms that was applied to the 1986 earthquake in the Andreanof Islands and revealed the long-term motion of the Aleutian arc.
[18] In 2015,[19] Das reviewed the research on measuring the speed of earthquake propagation since her 1977 paper,[5] including a consideration of the theoretical modeling, methods for analyzing seismic waveforms, field examples in which these methods have been applied, laboratory experiments, and examples of faults where high speeds of sheer will be possible.