Martin Gardner (born 21 October 1914) is a well-known American author on mathematics and the sciences, who also has written a substantial body of work on Oz and L. Frank Baum. His 1957 collaboration with Russel B. Nye, The Wizard of Oz and Who he Was, was one of the earliest serious considerations of the Oz mythos.
Gardner has also written the novel Visitors from Oz (1998). His 2003 collection of essays, Are Universes Thicker than Blackberries?, contains Oz-related material.