2002-Current, Dept. of Computer Science and Engineering, IIT Bombay. Associate Professor.

June 2009- May 2011, Dept. of Computer Science and Automation, IISc Bangalore . Visiting Faculty (on leave from IITB).

June 2009- May 2010, IBM India Research Lab, Bangalore . Part-time Visiting Researcher.

1994 - 2002, Network Design and Performance Analysis Department,  AT&T Labs (formerly, AT&T Bell Labs), NJ, USA.

• Principal Technical Staff Member (1999- 2002), Senior Technical Staff Member (1994-1999).

• Traffic Analysis of Cellular Calls: Traffic analysis and network planning of a cellular network. 
• Java Performance: Performance analysis of a Java-applet/JSP based client-server application. Led to work on characterization of Java performance using measurement and queuing models. 
• Template server performance: Performance analysis of a Web-template server application. Web Programming Technology Study: Collaborative work on performance and capacity characterization of a number of competing Web technologies using measurement analysis.
• Conference Call Setup on the Web. Capacity analysis and delay estimation using advanced queuing models. Generalization of this work was presented in INFORMS 1999.  
• Performance analysis using measurement signatures: Collaborative work on using a novel methodology of mapping measurement patterns to performance bottlenecks in applications.
• Performance and reliability analysis of large distributed systems.
• Overload control algorithms of AT&T network elements:  priority-based overload control algorithm for circuit-switched calls.

1990-1994: Duke University Durham, NC, USA.

• Graduate Assistant.
•  Research in modeling and analysis with Stochastic Petri Nets and Queueing Networks.

• Instructor for: Introduction to Programming in Pascal. (Summer, 1993)