Drawing some of the leading statisticians and economists in the world to the lush Calcutta (now known as Kolkata) campus of the Indian Statistical Institute, Mahalanobis helped elevate it to an institution of international excellence. Together, they helped calculate India"s GDP, staffed the Central Statistical Organization, designed the National Sample Survey, and brought India its first-ever digital computers. Much of the institutional architecture they built holds up even today, and India marks Mahalanobis" birth date, 29 June, as "Statistics Day".