저자 Jay Koo는 TOEFL, SAT, GMAT 공인 마스터 트레이너. San Francisco Education Consulting . Princeton Review Korea 상무이사. South Bay Education Consulting 회장. 저서로는 'WEB TOEFL Listening Coach', 'WEB TOEFL Reading Coach', 'WEB TOEFL Speaking Coach', 'WEB TOEFL Writing Coach', 'New TOEIC Speaking Coach', 'New TOEIC Writing Coach' 등이 있다.