Martin Gardner Home Site (Martin Gardner Centennial 1914-2014)
There is also a web page for testimonials:
Martin Gardner Testimonials
My testimonial is #55.
Note also this National Public Radio broadcast:
Martin Gardner, Genius Of Recreational Mathematics
NPR, April 12, 2014 (sound file & transcript)
Weekend Edition's own "Math Guy" Keith Devlin calls the late Martin Gardner the greatest "math guy" of all time. As Devlin tells NPR's Scott Simon, Gardner had little formal mathematics training.