PostgreSQL to MongoDB Leonid Chetverikov (Rus)

One of the most broadly adopted relational databases is PostgreSQL (also known as Postgres), which was developed by UC Berkeley computer scientist Michael Stonebraker in the 1980’s, building on, and simplifying, many of the concepts pioneered in the earlier Ingres project (POSTinGRES). Today it is a widely-used open source project with many contributors.