Alexey Leonidovich Pajitnov is a Russian computer engineer and video game designer who is best known for creating, designing, and developing Tetris in 1985 while working at the Dorodnitsyn Computing Centre under the Academy of Sciences of the Soviet Union. After Tetris was released internationally in 1987, he released a sequel in 1989, entitled Welltris.

Tetris is a puzzle video game created in 1985 by Alexey Pajitnov, a Soviet software engineer. It has been published by several companies for multiple platforms, most prominently during a dispute over the appropriation of the rights in the late 1980s. After a significant period of publication by Nintendo, in 1996 the rights reverted to Pajitnov, who co-founded the Tetris Company with Henk Rogers to manage licensing.