The Leiden Collection that Thomas S. Kaplan and his wife, Daphne Recanati Kaplan, have assembled over the past 17 years includes more than 250 paintings and drawings by many of the finest artists from the Dutch Golden Age. Named after Rembrandt van Rijn’s native city, The Leiden Collection has extraordinary depth and breadth in paintings by Leiden artists, ranging from significant paintings by Rembrandt and Jan Lievens to outstanding works by Gerrit Dou and Frans van Mieris. This essay presents an overview of the Collection. “A Portrait in Oil,” Tom Kaplan’s personal account of his and Daphne’s journey as collectors of Dutch art, explains how the Collection took shape.