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.
[12] [13] He graduated from Brooklyn Technical High School and obtained a bachelor's degree from the City College of New York and a master's degree in physics from Columbia University.
[14] He lived in Mill Valley, California[15] and died on August 27, 2019.