Gary Gruber

Gary R. Gruber (November 19, 1940 – August 27, 2019) was an American theoretical physicist, educator,^[1] and author who wrote books and software programs for test preparation.^[2] His work focused on test-taking and critical thinking skills.^[3][4][5] His writings included the Gruber's Complete Guide series^[6] as well as books and columns of brain teaser puzzles^[7][8] and other articles.^[9][10][11] He also worked with schools, school districts, state departments of education and other educational organizations in the development of testing and critical thinking skills and educational motivation programs.^{[12] [13]}