This chart shows whether Jacob van Ruisdael’s total sales are going up ... Using the median auction price offers a more representative view of the artist’s auction market over time.

Starting this month, however, the museum is focusing on one very special area of strength: a quartet of 17th-century landscapes by the Dutch painter Jacob van Ruisdael. Between 1962 and 1967 ...

His recent catalog, “Jacob van Ruisdael: Master of Landscape” (Yale University Press), accompanies the new Ruisdael exhibit, opening October 23 at the Philadelphia Museum of Art. Slive’s ...