found: LCCN 62-19796: His Basic programming concepts and the IBM 1620 computer, 1962(hdg.: Leeson, Daniel N.; usage: Daniel N. Leeson)
found: NUCMC data from Amer. Jewish Hist. Soc. for His Genealogical charts, 1976.(Leeson, Daniel Nathan, 1932- )
found: LC data base, 5-8-84(hdg.: Leeson, Daniel N.; usage: Daniel N. Leeson)
found: Leeson, D. Opus ultimum, the story of the Mozart Requiem, c2004:t.p. (Daniel N. Leeson) p. 4 of cover (Daniel N. Leeson; expert on Mozart; officer in the Mozart Society of America; bass clarinetist with the San Jose Symphony for 20 years; author of fiction work, The Mozart forgeries, 2004)
found: Iowa State Univ., Dept. of Mathematics, WWW site, June 6, 2005:colloquia/Daniel N. Leeson curriculum vita (Daniel N. Leeson; business executive with the IBM Corporation for almost 30 years; frequent speaker on the subject of the history of computing and is published in the periodical of the American Federation of Information Processing Societies, etc.; his 1962 book on computer programming is one of the earliest in the industry; also a professional performing musician (bass clarinetist with the San Jose Symphony orchestra for 20 years) and one of the world's leading independent Mozart scholars; author of The Mozart forgeries (2004) and Opus ultimum, the story of the Mozart Requiem (2004); historian and genealogist)