; Buried: Tartu)[1] (referred to mostly as Ludwig Schwarz),[2] was a Baltic German astronomer[3] of Imperial Russia, explorer, and professor[1] of astronomy at the University of Dorpat[4] honored with the Konstantin Medal[note 1] of the Imperial Russian Geographical Society.

[5] Schwarz also was a recipient of the Demidov Prize[5][note 2] of the Academy of Sciences of St. Petersburg in 1865 for his work in geodesy.

[5] Following assignment by Friedrich Georg Wilhelm Struve as a field expedition astronomer (1849-1853) to study the Amur River,[5][3] astronomer Schwarz led (1854-1862) the East Siberian Expedition of 1855 which extensively explored unknown and unmapped territory in Eastern Siberia, such as the Turan Range and the North Baikal Highlands.

[5] The separate tomes concerning the vegetation and wildlife reports were prepared by the expedition's botanist and zoologist Gustav Radde.

[9] The bird was described in 1863 by naturalist and fellow explorer Gustav Radde who served in the East Siberian Expedition of 1855 led by Schwarz.