From the congregation's event page:

The topic "Immanence and Immensity: Towards an Atheist Spirituality" will be presented by Rev. Roger Brewin, Minister Emeritus of First Unitarian Church of Hobart, IN. After retiring from 40 years in UU parish and community ministry, he spends winters in Melbourne with his wife, Kathy. He is active in the UU Humanists organization by serving as Editor of the Journal of Religious Humanism, and curator of the Immigration fabric art show, "Ribbons Not Walls."