David and Yonda Schwarz received career missionary appointment in 1988 to the Central American country of Costa Rica. Upon arrival on the field with their two daughters in 1991, David became the director of the Bible School. In 1992, he became president of the national work, a position he served in until his appointment as Regional Director. Yonda served as the treasurer of the national work and director of the ladies on a national level from 1992 until 2011.
The Schwarz family pioneered a church in the central valley of Costa Rica which they pastored for twelve years. During their tenure, the work grew in every aspect. The work in Costa Rica has continued to grow and is experiencing revival. Currently, there are 180 churches and preaching points, 152 licensed ministers, 594 studying in the Bible Schools, and over 10,823 constituents in the work in Costa Rica. There is economic stability and positive growth and maturity in all areas of the work.
In 2012, they were appointed to serve as Regional Directors of the Central America/Caribbean Region. In January 2019, they were given the responsibility of the South America Region. They now supervise Mexico, Central America, the Caribbean Islands and all of South America. The Regional work requires a lot of travel. Although the two combined regions involve a large geographic area, there is a great revival with great missionaries and national leaders. They are dedicating themselves to help promote continued growth.