Mare Kitsnik is simultaneously a freelance teacher of Estonian as a second language and a freelance author of Estonian study materials and training programmes. Many of her study guides have been published.Leelo Kingisepp is a highly experienced teacher and teacher-trainer of Estonian as a second language; he has lectured extensively in this field at university level, and has also taught English and Finnish. He is an established author of many titles aimed at providing guidance to second language teachers, and has written in-depth Estonian coursebooks and textbooks.