Doug Kuhlmann's GeoGebra stuff

About Me

I retired in 2014 after teaching in private secondary boarding schools for 40 years, the last 31 at Phillips Academy in Andover, MA.  I always enjoyed teaching!  I discovered GeoGebra in January 2009 and am having fun learning its power. I received a Ph.D. in math from Northwestern University in 1978. My latest interest is learning about hyperreal--infinitesimals and infinitely large hyperreal numbers.


If you have requests, I would love to try to fulfill them.  Email me at [email protected] or [email protected] 



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