found: Sjøgren, T. The discography of Duke Jordan, 1982:t.p. (Duke Jordan) p. 9 (Irving "Duke" Jordan, b. 1922 in New York)
found: Grove music online, May 26, 2005:Jazz (Jordan, Duke (Irving Sidney); b. Apr. 1, 1922, New York; American pianist and composer)
found: New York times WWW site, Aug. 14, 2006(in obituary published Aug. 12: Duke Jordan; b. Irving Sidney Jordan, Apr. 1, 1922, New York; d. Tuesday [Aug. 8, 2006], Valby, Denmark, aged 84; pianist whose work with the saxophonist Charlie Parker endures in the jazz canon)
found: African American National Biography, accessed April 22, 2015, via Oxford African American Studies Center database:(Jordan, Duke; Irving Sidney Jordan; jazz musician, pianist; born 01 April 1922 in New York, United States; member of Clarke Monroe Sextet (1941); worked with Al Cooper's Savoy Sultans and Roy Eldridge Big Band (1946); member of Charlie Parker Quintet (1947-1948); made his first record as a leader (1954); toured Scandinavia with Rolf Ericson (1956 and 1959); was out of music entirely (1967-1971); made a strong comeback (1970s), recorded more than 20 albums for Danish Steeplechase label (1973); toured Scandinavia and the Netherlands (1977 and 1978); permanently moved to Denmark, performed and recorded extensively (1978); died 08 August 2006 in Valby, Denmark)