At 4:00 p.m. on Tues., Apr. 15, Ryan Calkins of Witness for Peace will speak on the campus of Pacific Lutheran University about his work with Witness For Peace in Colombia.  --  Calkins has worked on the impact of war on Afro-Colombian communities, and is co-editor of a forthcoming volume published by Duke University Press entitled Colombia and the International Community.  --  He was a signatory of a 2002 "Witness for Peace Letter on Peace Process" from the WFP Team in Colombia.  --  In 2005, he was an organizer of a two-day conference on "U.S. Colombia Policy at a Crossroads: Recent Experience and Future Challenges" at Yale University, where he has done graduate work in international relations.  --  BACKGROUND:  Witness For Peace is an organization that for 25 years has devoted itself to support peace, justice, and sustainable economies in the Americas by changing U.S. policies and corporate practices that contribute to poverty and oppression in Latin American and the Caribbean.  --  WFP was founded while U.S.-funded Contras were targeting Nicaragua, and helped document the human consequences of the policies of the Reagan administration and to make them known the U.S. public through vigorous media strategies, delegations, and grassroots mobilizations.  --  WFP now focuses on Nicaragua, Mexico, Cuba, and Colombia, mobilizing nonviolent faith-based activists working together to hold policy makers accountable.  --  With an annual budget of only about $1 million, WFP has more than 15,000 members and has send more than 10,000 people abroad for short visits while maintaining teams of international volunteers at sites of concern.  --  For more information on its program in Colombia, see here.  --  Avi Chomsky, 51, the eldest daughter of Noam Chomsky, is active in WFP's Colombia program....