Julio Garavito (1865-1920) was Colombia's greatest mathematician, astronomer and engineer.
Julio Garavito is on the Republic of Colombia 20000 peso note
The Republic of Colombia
Julio Garavito was one of Colombia's greatest scientific minds. He was a pioneer in astronomy, mathematics, engineering and optics. He was also a proud Colombian who worked on economic theories to help rebuild his nation after the disastrous 1000 Day's War. He was instrumental in the construction of Colombia's railways. Today, a prestigious school is named after him, and the International Astronomical Union has named a lunar crater in his honor. The moon is on the back of the bill.