Circumstantial evidence, including several larger panel paintings, indicates that he may be identical with Gerard Horenbout.
Stylistically, the Master's miniatures are distinguished by their collections of robust and unidealized figures, set against colorful landscapes and detailed interiors.
He had a knack for depicting narrative, and would frequently use obscure Biblical images when constructing his paintings; his scenes of daily life, designed for calendar illuminations, are considered particularly vivid.
Using various illusionistic elements, he often blurred the line between the miniature and its border, frequently using both in his efforts to advance the narrative of his scenes.
It has been suggested that their move was in connection with an attempt by the King, or possibly Cardinal Wolsey, to revive English manuscript illumination by establishing a workshop in London, but this is controversial.