About the Author
For over 30 years, Sang Hyun Park made a special study of math education as the head of the MRI(KOREA), MTC(USA), MTC(CANADA). He has written over 200 math textbooks and test prep books for middle and high school students. He has also trained math teachers and high level students with his works and classes. Especially, Sang Hyun Park is renowned for his special teaching method to serious math teachers as well as gifted math students.