For 10 points, name this teacher of Rogier van der Weyden who is identified with the Master of Flemalle and painted the Merode Altarpiece.
In one of this artist's works an angel holds a banner over a paralyzed midwife with a Latin inscription translating "touch the child and you shall be healed." This artist's version of The Marriage of the Virgin depicts the titular wedding occurring in front of the church of Notre-Dame-du-Sablon. He depicted St. Barbara sitting on a red plush bench while the tower where she was imprisoned is seen through a window on the right side of an altarpiece whose center panel is lost, and which is named for a Cologne theologian. In addition to the Seilern Triptych and the Werl Altarpiece, he featured a decrepit barn in his Nativity, which combines the main Nativity story with depictions of the adoration of the shepherds and the legend of the midwives. In his best known work a hanging bronze laver appears in the back and the Virgin sits next to a sixteen sided table representing the Hebrew prophets, while she is being visited by the angel Gabriel. On the right panel of that work this artist put a saw-like sword at the feet of Joseph who is using a screwdriver to make a mousetrap with which he plans to trap the Devil.  For 10 points, name this teacher of Rogier van der Weyden who is identified with the Master of Flemalle and painted the Merode Altarpiece.
In one of this artist's works an angel holds a banner over a paralyzed midwife with a Latin inscription translating "touch the child
{Robert Campin} (accept {Master} of {Flemalle} before mentioned)