Joos de Beer was an Early Netherlandish painter

Painting

Painting is the practice of applying paint, pigment, color or other medium to a surface . The application of the medium is commonly applied to the base with a brush but other objects can be used. In art, the term painting describes both the act and the result of the action. However, painting is...

 from Utrecht.

Biography

According to Karel van Mander, he was a pupil of Frans Floris

Frans Floris

Frans Floris, or more correctly Frans de Vriendt, called Floris was a Flemish painter. He was a member of a large family trained to the study of art in Flanders.-Biography:...

 in Antwerp, who later returned to his native Utrecht (city)

Utrecht (city)

Utrecht city and municipality is the capital and most populous city of the Dutch province of Utrecht. It is located in the eastern corner of the Randstad conurbation, and is the fourth largest city of the Netherlands with a population of 312,634 on 1 Jan 2011.Utrecht's ancient city centre features...

 and became the teacher of Abraham Bloemaert

Abraham Bloemaert

Abraham Bloemaert was a Dutch painter and printmaker in etching and engraving. He was one of the "Haarlem Mannerists" from about 1585, but in the new century altered his style to fit new Baroque trends...

 and Joachim Wtewael

Joachim Wtewael

Joachim Anthonisz Wtewael , was a notable Dutch painter and engraver.Wtewael was born and died in Utrecht, where he began his career engraving glass with his father...

.

Together with Anthonie Blocklandt van Montfoort (who he knew as a fellow pupil of Frans Floris), he is known as the founder of the Utrecht school of painting that started around 1590. Van Mander states that De Beer had many paintings by Blocklandt in his workshop that young Bloemaert copied.

Reference