En plein air (French pronunciation: [ɑ̃ plɛn‿ɛʁ]) is a French expression which means "in the open air", and is particularly used to describe the act of painting outdoors, which is also called peinture sur le motif ("painting on the ground") in French.

Artists have long painted outdoors, but in the mid-19th century working in natural light became particularly important to the Barbizon school and Impressionism. The popularity of painting en plein air increased in the 1870s with the introduction of paints in tubes (resembling modern toothpaste tubes). Previously, each painter made their own paints by grinding and mixing dry pigment powders with linseed oil. The Newlyn School in England is considered another major proponent of the technique in the latter 19th century.

It was during this period that the "Box Easel", typically known as the French Box Easel, was invented. It is uncertain who developed it first, but these highly portable easels, with telescopic legs and built-in paint box and palette, made treks into the forest and up the hillsides less onerous. Still made today, they remain a popular choice even for home use since they fold up to the size of a brief case and thus are easy to store.

Thomas Kinkade (January 19, 1958 – April 6, 2012) was an American painter of popular realistic, bucolic, and idyllic subjects. He is notable for the mass marketing of his work as printed reproductions and other licensed products via The Thomas Kinkade Company. He characterized himself as "Thomas Kinkade, Painter of Light," a phrase he protected through trademark but one originally attributed to the English master J.M.W. Turner (1775–1851). He was claimed to be "America's most-collected living artist" before his death with an estimated 1 in every 20 American homes owning a copy of one of his paintings.

Kinkade grew up in the town of Placerville, California, graduated from El Dorado High School in 1976, and attended the University of California, Berkeley and the Art Center College of Design in Pasadena. He married Nanette Wiley in 1982 and the couple have four daughters: Merritt (b. 1988), Chandler (b. 1991), Winsor (b. 1995) and Everett (b. 1997), all named for famous artists. He and his wife had previously separated for over a year before his death in 2012.

Edward Brian (Ted) Seago RBA ARWS RWS (31 March 1910 – 19 January 1974) was an English artist who painted in both oils and watercolours.

The son of a coal merchant, born in Norwich, Seago was a self-taught artist, (although he received advice from Sir Alfred Munnings and Bernard Priestman), and enjoyed a wide range of admirers from the British Royal family and the Aga Khan to the common man. His works have been classified as either Impressionist or Post-Impressionist and included landscapes, seascapes, skyscapes, street scenes, his garden and portraits.

At fourteen, he won an award from the Royal Drawing Society, and from then on knew what he wanted to do in spite of his parents' initial disapproval. At the age of eighteen, Seago joined Bevin's Travelling Show and subsequently toured with circuses in Britain and throughout Europe.

In 1937 Seago gave evidence to a police enquiry into a blackmail gang in London's West End who exploited sodomy laws. His statement reveals he had a friendship with a young man in late 1936 who used a fake name and extracted money from Seago by deception.