In 1620 he became a doctor of law but he joined the work of his father. In 1635 they published the Atlas Novus (full title: Theatrum orbis terrarum, sive, Atlas novus) in two volumes. Joan and his brother Cornelius took over the studio after their father had died in 1638. Joan became the official cartographer of the Dutch East India Company.
Around 1649 Joan Blaeu published a collection of Dutch city maps named Tooneel der Steeden (Theater of Cities). In 1651 he was voted into the Amsterdam council. In 1654 Joan published the first atlas of Scotland, devised by Timothy Pont. In 1662 he reissued the atlas with 11 volumes, and one for oceans. It was also known as Atlas Maior.
A cosmology was planned as their next project, but a fire destroyed the studio completely in 1672. Joan Blaue died in Amsterdam the following year.
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