Rai Bahadur Daya Ram Sahni, under the direction of Sir John Hubert Marshall, led the first excavation of the Harappa site which led to the discovery of the Indus Valley civilization.
For further reading check the following articles:
|Major Sites in Indus Valley Civilization||Indus Valley Civilization|
|100 Must-Know Facts about IVC for UPSC||UPSC FAQ|
|NCERT Notes: Arts of the Indus Valley||NCERT notes for History (Modern, Medieval, Ancient), Art and Culture, and Geography|