Westernizers (Russian: Западник, zapadnik) were a group of 19th century intellectuals who believed that Russia's development depended upon the adoption of Western European technology and liberal government. In their view, western ideas such as industrialisation needed to be implemented throughout Russia in order to make it a more successful country. In Russian the term was known as Zapadnichestvo (западни́чество) which can be translated as "Westernism", and its adherents were known as the Zapadniks, westernists in English.

In modern usage, especially in the developing world, the term can refer to supporters of Western-style economic development.

Alexander Ivanovich Herzen (Russian: Алекса́ндр Ива́нович Ге́рцен) (April 6 [O.S. 25 March] 1812 – January 21 [O.S. 9 January] 1870) was a Russian pro-Western writer and thinker known as the "father of Russian socialism", and one of the main fathers of agrarian populism (being an ideological ancestor of the Narodniki, Socialist-Revolutionaries, Trudoviks and the agrarian American Populist Party). He is held responsible for creating a political climate leading to the emancipation of the serfs in 1861. His autobiography My Past and Thoughts, written with grace, energy, and ease, is often considered the best specimen of that genre in Russian literature. He also published the important social novel Who is to Blame? (1845–46).

Herzen was an illegitimate child of a rich Russian landowner, Ivan Yakovlev, by a young German Protestant woman, Henriette Wilhelmina Luisa Haag from Stuttgart. Yakovlev supposedly gave his son the surname Herzen because he was a "child of his heart" (German Herz).

He was first cousin to Count Sergei Lvovich Levitsky (1819–1898, Moscow, Russian: Сергей Львович Львов-Левицкий), considered the patriarch of Russian photography and one of Europe's most important early photographic pioneers, inventors and innovators. In 1860, Levitsky would immortalize Herzen in a famous photo capturing the writer's essence and being.

Peter the Great, Peter I or Pyotr Alexeyevich Romanov (Russian: Пётр Алексе́евич Рома́нов, Пётр I, Pyotr I, or Пётр Вели́кий, Pyotr Velikiy) (9 June [O.S. 30 May] 1672 – 8 February [O.S. 28 January] 1725) ruled the Tsardom of Russia and later the Russian Empire from 7 May [O.S. 27 April] 1682 until his death, jointly ruling before 1696 with his half-brother. In numerous successful wars he expanded the Tsardom into a huge empire that became a major European power. According to historian James Cracraft, he led a cultural revolution that replaced the traditionalist and medieval social and political system with a modern, scientific, Europe-oriented, and rationalist system.