What is the fine-grained topic of the following text: Bruce Guenther, ACTS Seminaries Faculty, has written a biography that features the life of his grandfather, who was a dairy farmer, community leader and bishop of the Old Colony Mennonite Church in Saskatchewan during the 1960s. Only return the topic.
Bruce Guenther's biography about his grandfather's life as a dairy farmer and bishop in Saskatchewan during the 1960s.