Kyung-Il Kwak:
Kyung-il Kwak has an MA in International Trade and works for a South Korean multinational electronics company operating in Europe. She has a background in teaching Korean to learners of all levels.

Robert Vernon:
Robert Vernon has a background in English language learning materials development at Cambridge University Press and Korean publisher Pagoda SCS. He spent three years living in Korea where he also worked as an English teacher. He co-authored the bestselling TOEIC Clinic Beginner Plus, a billingual Korean-English book, aimed at learners preparing for the English language TOEIC test.