Between 1976 and 1985, he was a faculty member at Rochester Institute of Technology; he also briefly held a research fellowship position at Gordon McKay Laboratory for Applied Sciences in Harvard University in between 1977 and 1978.
[2] Sarkar was the president of OHRN Enterprises, Inc., an incorporated business specializing in computer services and system analysis.
[3][4] Sarkar's research interests focused on "numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design."
[2] Along with his doctoral student Yingbo Hua, he developed the generalized pencil-of-function method for signal estimation with complex exponentials.
Based on Sarkar's past work on the original pencil-of-function method, the technique is used in electromagnetic analyses of layered structures, antenna analysis and radar signal processing.