Mailis Janatuinen is a retired missionary who served in Japan. She holds master's degrees both in English and in Theology. She has created the concept of Glad Tidings Bible Study and has written several guide books containing Bible study questions for evangelistic small groups. These guides are available in many languages. She has trained small group leaders in many countries in Europe, Asia, and Africa. She has written several Bible commentaries and studies, and she is a popular teacher on the Christian TV and radio channels of Finland.
available at amazon.com (click the picture).