Jan Voerman (Hattem 1890 - 1976 Blaricum) was the son of Jan Voerman Sr. from whom he learned the use of watercolor and oil paint. As a child he was fascinated by the world of plants and insects. As a fifteen-year-old, Jan received his first real assignment from his grandfather Verkade to make drawings for a nature album together with the author Jac. P. Thijsse and with, among others, the visual artists Wenckebach and Van Oort. A total of 27 Verkade albums were published until the outbreak of the Second World War.

Voerman Jr. completed training at the Rijksakademie van Beeldende Kunsten in Amsterdam and at the Royal Academy of Art in The Hague. In 1923 he married Hetty Mansholt and moved to Overveen where he became known as a lithographer for, among other things, export catalogs for flower bulbs and various calendars. The two later settled in Blaricum.

After the many Verkade Albums and commissioned works, Voerman junior was  devoted to free work and painting in oil. His love for all living things was visible in all his work. The way in which Voerman Junior depicts the beauty of decay is also loving. Paintings that still occasionally come to auction are beautiful flowers, small still lifes, a single portrait and some landscapes of the IJssel, for example, of which his father made so many. The flowers in particular are beautifully detailed and look like photographs. Voerman's style was modern, sharp and somewhat impressionistic.

In addition to his works, the collection of the Voerman Museum Hattem also includes those of Jan Voerman Sr., Jo Koster-van Hattem and Bé Thoden van Velzen.