Mari-Jo P. Ruiz (1943–2022) was a Filipina mathematician and professor of mathematics at Ateneo de Manila University.
[1] Ruiz specialized in graph theory and operations research.
She joined the Ateneo de Manila faculty in 1965,[3] eight years before the school began accepting women as students.
[4] She chose academia over a competing job offer from industry because at the time it paid slightly better.
[1][6] With Jin Akiyama, she was the author of the book A Day’s Adventure in Math Wonderland (World Scientific, 2008; translated into 7 other languages).