His research emphasis is on mathematical modeling of networking systems, bridging the gap between practice and analysis. He served as the Vice-Chair of the Computer Science Department at Columbia University from 2009 to 2011, and in 2011 he spun out Infinio, a company in the area of datacenter storage. The company has offices in Massachusetts and New Hampshire and employs more than 70 people. He is also credited with inventing live-microblogging at Cricinfo, a company he co-founded while a graduate student at UMass Amherst, predating Twitter by 10 years. Cricinfo was later acquired by ESPN and is still the world’s most popular sports portal.