John Prince
November 13, 1941 – December 6, 2005

John specialized in collecting K&E rules, with a strong interest in Pickett as well. In 2002, John described how he started with slide rules in 1960: "I used a K&E 4181-3 ; we were mandated to use either a 4081-3 or 4181-3 in our freshman slide rule class. I chose the cheaper (very important to a married 18 year old) rule and never regretted it despite the dire predictions from some faculty about dimensional stability and durability. I never really needed a more complex rule while working in graduate school as an electrical engineer." [ISRG, message 15929]

Dick Schwartzer
March 5, 1933 – March 11, 2005

Dick operated The Slide Rule Emporium, the major source for new-in-box Pickett slide rules. Dick was a friend to many.

Joe Levine
December 19, 1948 – January 25, 2005

Joe was a regular contributor to the ISRG list from its beginnings, with the handle "JoeDentist," perhaps best known for his Schmendrolog April Fools' Day hoax.

Herman van Herwijnen
October 15, 1929 – August 8, 2004

Herman was a prominent member of the Dutch Circle of Slide Rule Collectors. His major work was a CD database with over 5000 slide rules cataloged (including images). In addition he co-authored the book Calculating on Slide Rule and Disc and published many times in the Journal of the Oughtred Society. He was also a seller of slide rules.

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Michael O'Leary
November 27, 1951 – July 19, 2003

Michael's slide rule accomplishments ranged from development of the K&E and Pickett master XREF spreadsheets, to moderating the ISRG discussion list, to writing for the Journal of the Oughtred Society. Michael corresponded with many collectors around the world.