- Lev Vygotsky was a Russian psychologist born in Orsha, Russia in the late 19th century.
- He studied a range of topics at Moscow State University, including sociology, linguistics, psychology and philosophy, graduating with a law degree in 1917.
- Vygotsky developed theories on cognitive development that emphasized the fundamental role of social interactions and the "zone of proximal development," defined as the distance between what a learner can do independently and what they can do with guidance from others.