Who investigated Machu Picchu archaeologically in 1911?

The American archaeologist and Yale University professor Hiram Bingham is credited with initiating the scientific study and archaeological investigation of Machu Picchu in 1911.123

While some scholars believe the German adventurer Augusto Berns may have visited the site as early as 1867, it was not widely known in the West until Bingham was led to the ruins by a local Quechua-speaking resident named Melchor Arteaga on July 24, 1911. Bingham subsequently returned to lead formal excavations at the site in 1912 and 1915.123