High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Art of Problem Solving (AoPS) is a mathematics education company founded by Richard Rusczyk in 2003.[1] It markets and sells textbooks (such as Introduction to Geometry) and online courses for middle school and high school students.A set of two books by the same name, The Art of Problem Solving, was coauthored by Richard Rusczyk and Sandor Lehoczky. The books, which are about 750 pages together, are for students who were interested in mathematics or competing in mathematics competitions.