A 1975 graduate of Valparaiso High School, Jon Costas received his B.A. from St. Joseph's College in Rensselaer, Indiana, and a law degree from Valparaiso University School of Law in 1989, and a masters degree in practical theology from Wesley Seminary in 2017. Jon is currently the mayor of Valparaiso, and has held that office since 2004.
Jon currently serves as elder chair at Calvary and is active in teaching adult Bible classes as well as leadership workshops.
Jon is an energetic community leader and has served on numerous state and local boards and community efforts. He is active in a variety of activities including running, biking, flying, playing guitar and reading. Jon and his wife Sharon have four adult children and live in Valparaiso. They have been members of Calvary since 2004.