Osias Beert was probably born in Antwerp. He became a pupil of Andries van Baesrode I in 1596 and was accepted as a master in the Antwerp guild in 1602. In addition to being a still-life painter, mainly of flowers, fruit and breakfast pieces, he was active as a cork merchant. None of his paintings are dated, although the copper plates of several have been dated 1607-09. His wife's nephew Frans Ykens, is the best known among his six registered pupils.