Stefan Knapp (1921 – October 12, 1996) was a Polish-born painter and sculptor, who worked in Great Britain. He developed and patented a technique of painting with enamel paint on steel, facilitating decorating public architectural structures.
Knapp was born in Biłgoraj. His father's name was Antoni and his mother was Julia, née Wnuk.
In 1935 he began studies at the Lwów Polytechnic. After the outbreak of World War II the Soviet Union occupied Lwów, murdered Knapp's father and sent Stefan to a gulag in Siberia. There, among other things, he worked building schools for Russian children who had been orphaned because their parents had been imprisoned or murdered for political reasons. While in the Gulag, because artistic endeavors were limited, he made chess sets out of bread and playing cards out of trash for his fellow prisoners.
He was released in 1942 after the Sikorski-Mayski Agreement was signed between Poland and Soviet Union. He joined the Anders Army and volunteered for the air force, hence he was shipped to Great Britain. Knapp began his training as a pilot on 29 June 1942 in Hucknall. He served as an officer and Spitfire pilot in the Royal Air Force. While in the RAF Knapp pursued his art by painting or sketching portraits of his fellow pilots in 318 Squadron. After the end of the war he remained in London and took advantage of a veteran's stipend to further his studies at the Royal Academy and at the Slade School of Fine Art.
His experience in the Gulag and as an RAF pilot caused him to suffer from recurring nightmares and insomnia for many years. Consequently, he used his art as a form of therapy. In the late 1940s this resulted in a series of works titled Gulag. The works were noted for many experimental techniques.
Knapp was known for producing murals of unprecedented size with materials which were meant to last for thousands of years. He first received wide attention and acclaim during his exhibition in London in 1954. There he presented a unique and innovative style and technique, which involved melting glass into pieces of light steel, using specially made furnaces. Prior to finding fame he worked as a ski instructor in the Swiss Alps to make ends meet.
In the late 1950s Knapp moved away from traditional painting to experiments with enamel and sculpture. In the 1960s he painted several murals at Heathrow Airport, which were later reinstalled in the 1990s. In the early 1950s he painted a mural in the foyer of Hallfield Primary School, Westminster which was designed by the architect Denys Lasdun. He also painted a mural for the Warsaw metro entitled The Battle of Britain. Between 1954 and 1968 he held at least one exhibition each year, including ones in the Netherlands, Austria, and Peru. In 1972, he proposed an astronomy-themed work for the Nicolaus Copernicus University in Toruń which was accepted. Knapp also designed many decorations for synagoguess, many of which he based on his memories of synagogues, kirkuts and Jewish prayer houses in his childhood town of Biłgoraj.
In the 1970s Knapp, together with his wife, moved to the British countryside, where he built a large furnace for his work. Knapp is also the author of the largest mural in the world, sized at 200⨯50 feet (about 60⨯15 metres), painted on the Alexander's department store building in Paramus, New Jersey. The building has since been demolished and the mural is currently in storage.
For his military service he was awarded the Virtuti Militari cross. Knapp was the only Pole ever to receive the Churchill Fellowship, which he used to study and expand his knowledge of murals in Guatemala, India, Iran, Japan and Mexico. His other awards included the Knight's Cross of Polonia Restituta and the Cross of Valor. He was one of the best known Polish artists working in Great Britain. He wrote an autobiography "Kwadratowe Słońce" (The Square Sun) about his life in the Siberian gulag.
- Cathy Knapp, "Stefan Knapp: A Visionary Artist Who Worked In Enamel", Glass on Metal: The Enamelist's Magazine, Volume 18, Number 3, October 1999, 
- New York Times, "Stefan Knapp, 75; Created Big Mural", October 20, 1996, 
- Rochelle L. Millen, Jack Mann, Timothy Bennett, "New perspectives on the Holocaust", NYU Press, 1996, pg. 31, 
- Biłgoraj City Webpage, "Stefan Knapp - wspomnienie o wybitnym artyście" (Stefan Knapp - memories of a great artist), accessed 31 May 2009, 
- Wojciech Zmyślony, "Stefan Knapp" in "Polskie Sily Powietrzne w II Wojnie Swiatowej" (Polish Air Force During World War II), , accessed 5/31/09
- University for Creative Arts, "Stefan Knapp"
- Stefan Knapp Biography, artnet, .