In 1939, Risom traveled to New York City to study American design. He found it difficult to find work as a furniture designer in New York, however, and was forced to accept a number of textile designs that ultimately secured him freelance work with designer Dan Cooper. This led to his work being included in the Collier’s «House of Ideas» designed by Edward Durell Stone and constructed in front of Rockefeller Center during the 1939 New York World’s Fair.
In 1941, Risom teamed with entrepreneur Hans Knoll and in 1942, they launched the Hans Knoll Furniture Company with 15 of the 20 pieces in the inaugural «600» line designed by Risom. These works included stools, armchairs and lounges, made from cedar and surplus webbing—works which have since become design classics.
With the advent of World War II, Risom was drafted into the United States Army in 1943 and served under GeneralGeorge S. Patton. After completing his military service, Risom briefly returned to Knoll in New York, but soon decided to launch his own firm, Jens Risom Design (JRD), which he launched on 1 May 1946.
Risom’s reputation as a furniture designer continued to grow, and Risom began to promote Scandinavian design in home furniture to the broader American public. In the 1950s, JRD ran a series of ads featuring photography by Richard Avedon and the slogan «The Answer is Risom.» The result of this success was that in 1954, JRD launched a major expansion of its production facilities. In the late 1950s, JRD shifted its focus away from home furnishings and towards office furniture, hospital furniture, and library furniture. In 1961, Risom was one of six furniture designers featured in a profile in Playboy magazine. One of Risom’s executive office chairs became famous when Lyndon B. Johnson chose to use it in the Oval Office.
Risom sold JRD to Dictaphone in 1970, after having run the company for 25 years. Risom stayed on as CEO for 3 years, and then relocated from New York to New Canaan, Connecticut and launched a consulting service, Design Control.
Risom died at his home in New Canaan, Connecticut, at the age of 100.