[1] Aleksey Tillo's grandfather was a French Huguenot, but his father was a citizen of the Russian Empire.

His greatest achievement was a hypsometric map of the European part of Russia published in 1889.

[2] For creating this map Tillo was elected a corresponding member of the Russian (1892) and Parisian Academies of Sciences.

[citation needed] Aleksey Tillo is known to have coined the term Central Russian Upland.

Aleksey Tillo also authored a number of works on geomagnetism and meteorology.