An expert on Economics,War and Peace/Just War, Ms. Dennis is director of the Maryknoll Office for Global Concerns, and serves as co-president of Pax Christi International and a Pax Christi USA Ambassador of Peace. She holds an M.A. in Moral Theology from Washington Theological Union and is co-author or author of six books on the spirituality of social justice, peace and the integrity of creation.

Ms. Dennis has traveled widely among the marginal communities where Maryknoll missioners work in Latin America. She has participated in election observer delegations to Mexico and Haiti and on solidarity delegations to many other countries. She serves on the board of directors of the Washington Office on Latin America, the Latin America Working Group, and the International Resource Center. She has lectured at universities, conferences, workshops, parishes and high schools over the past 30 years on topics such as Catholic Social Teaching, globalization, peacemaking, and economic justice. Ms. Dennis is a contributor to numerous publications.