Dr. Tissa Weerasingha is Founder and President of Calvary International Ministries and the Chief Pastor of Calvary Church, Sri Lanka, an indigenous church planting movement, which has planted over 75 branch churches locally and overseas.

He is also the Founder and Principal of Calvary Theological Seminary - CTS.

There is a need in developing nations for training resources in effective church planting, church growth, and cross-cultural missions from those nations. CIM is in a unique position to fill that need through materials and resources developed in the Two-Thirds World. Training tapes, books and manuals as well as leaders and ministry teams may be scheduled for short term training. Nationals can be assisted in nurturing a church planting movement in their cultural context, developing leaders and forming their own cross-cultural missions.

However, the scope of CIM is not limited to developing countries. CIM recognizes the need in the developed nations to effectively reach "migrating ethnics" with a culturally sensitive message, as well as continuing to reach their own peoples. Because of fraternal relationships, especially with independent churches, a multi-national exchange of resources is possible. This exchange assists all participating churches to maximize their resources in both mono-cultural and cross-cultural ministry.