Professional Memberships and Service

Member of MAA 1956--, AMS 1954--, SIAM 1974--92, DMV (Deutsche Mathematiker-Vereinigung) 1979--, ÖMG  (Österreichische Mathemische Gesellschaft) 1979--,  ORSA-INFORMS (Operations Research Society) 1993--97.

President of Minnesota Section MAA, 1959--60.

Member of Board of Governors MAA, 1971--74.

MAA Visiting Lecturer, 1964-66.

MAA Committee on the Putnam Prize Competition, 1986--89.

MAA Committee on American Mathematics Competitions, USAMO Subcommittee, 1988-90.

MAA Committee on Local and Regional Competitions, 1997--2002.

Grader for Putnam Prize Competition, 1966; 1986.

Grader for USA Mathematical Olympiad, 1988, 1989, 1990, 2003, 2005. 2008

Problems Panel, MAA Subcommittee for the USAMO, 1988--.

MAA Liaison for Concordia College, 1995--.

Director, No. Central Section MAA Team Competition, 1997--

Construct problems and grade papers for regional competitions: Mich. Autumn Take-Home Challenge, 1995, 2003, 2007; Lower Michigan Mathematics Contest 2007; Ohio Five College Mathematics Contest, 1996; NCS/MAA Team Contest 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008; East Central Colleges Undergraduate Mathematics Competition 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008; Iowa Section MAA Team Contest 2001, 2002, 2005; Arkansas Undergraduate Mathematics Competition 2004, 2005, 2006, 2007, 2008; Massachusetts Association of Math Leagues Level II Olympiad, 2002--2003.

Assistant Editor, Problems Section, Mathematics Magazine, 2001--.

Editorial Board, MAA Problem Books Series, 2000--.

Coordinator (grader), 42nd International Mathematical Olympiad, Washington D.C., July 2001.

Reviewer for Zentralblatt für Mathematik (Berlin), (over 300 reviews since 1967) and for Mathematical Reviews (Ann Arbor, MI); (over 200 reviews since 1978)  books and articles in English, German, Spanish and French (about 6 book reviews and 20 article reviews per year, on average).  (A reviewer reads a recently published article or book at the request of the editors of the reviewing journal and writes a brief summary to help the reader of the review decide whether or not to look further at the article or book.)

Have served as referee for the following journals.  (A referee makes a critical reading, at the request of a journal editor, of an article which has been submitted for publication, and makes a recommendation to help the editor decide whether to publish it.)
   Mathematics Magazine,
    Americal Mathematical Monthly,
    International Journal of Game Theory,
    Journal of Optimization Theory and Applications,
    Naval Research Logistics,
    Fibonacci Quarterly,
    European Journal of Operational Research,

    College Mathematics Journal  

Three invited addresses at MAA Section meetings.

Numerous contributed papers (20 or so) at MAA Section meetings; some at AMS, SIAM, ORSA and DMV meetings.