In the fall of 1994, the elders of First EFC made a decision to move forward with a new church plant in the Webster Groves/Kirkwood area by beginning a mini-congregation of interested families. Chuck Monk, serving a year long internship following graduation from Denver Seminary, was available to lead this new mini-congregation beginning in January of 1995. Chuck led a study of the book of Acts over the next nine months leading up to the church plant in September. In March, a leadership team was formed and in June, Brad Harper, Associate Pastor at First EFC, accepted a call to be the first pastor of Cornerstone EFC. On September 10, a Cornerstone "commissioning " service was held at First EFC in the morning followed by the Cornerstone's first Annual Congregational Meeting in the evening. Elder and Deacon boards were elected at that meeting.

Cornerstone’s first service was held in the cafeteria of Hixson Junior High in Webster Groves on September 17, 1995. Gene Moniz, Associate Pastor at First EFC, preached that first service to about two hundred members, visitors and well wishers from First EFC as Pastor Brad was in California to attend the funeral of his father. In the first four years of our existence, Cornerstone’s Sunday morning attendance has grown from about 100 to about 250. During that time, Cornerstone called Janet Williamson to serve as the Director of Children's ministries, and John Richardson to serve as Associate Pastor of Community Life.

During the spring of 1998, Pastor Harper accepted a teaching position at Multnomah Bible College in Portland, Oregon. Cornerstone entered into a period of transition during which Associate Pastor John Richardson was selected to replace Pastor Harper as senior pastor. Pastor Harper preached his final message on June 13, 1999. John Richardson preached his first message as Senior Pastor the following week, June 20, 1999.

Cornerstone entered into another period of transition during the spring of 1999 as the facility of South Webster Presbyterian Church, 921 Edgar Road, was offered for sale. On the evening of June 27, 1999, Cornerstone congregation voted to purchase the facility and on August 25, 1999 took possession. Cornerstone began renting the church facility for worship on the 4th of July, 1999.

Recognizing the importance or corporate worship the church decided to call Dawie Naude as Worship Director in the spring of 2005.

On Sunday, February 19, 2006. John Richardson left the church after10 years of faithful service to Cornerstone.

The Evangelical Free Church of America was formed in 1950 by the merger of two church bodies: the Swedish Evangelical Free Church and the Norwegian-Danish Evangelical Free Church Association. Both groups had been birthed in the revival movements of the late nineteenth century.

The Swedish group had its formal beginnings in Boone, Iowa, at a conference held in October of 1884. In that same year, two Norwegian-Danish groups began to worship and fellowship together in Boston, Massachusetts and Tacoma, Washington. By 1912, both the Swedish Evangelical Free Church and the Norwegian-Danish Evangelical Free Church Association had been formed.

Those two associations, representing 275 local congregations, were formally joined together as they gathered for a merger conference in June of 1950 at the Medicine Lake Conference Grounds near Minneapolis, Minnesota. The international and national offices of the EFCA have been located in Minneapolis since the merger took place.

Dr. E.A. Halleen, who had served for 28 years as the president of the Swedish association, was elected as the first president of the newly formed Evangelical Free Church of America. His one-year term crowned a brilliant ministry career as a pastor, teacher, evangelist and church leader.

In 1951, Dr. Arnold T. Olson was elected president. He had served as the president of the Norwegian-Danish association for six years, as chairman of the merger committee and as the first moderator of the EFCA. Under his leadership, The Evangelical Free Church of America broke the boundaries of its ethnic background and flowed into the mainstream of the evangelical movement. Dr. Olson served with distinction as the president of the EFCA for twenty-five years.

Dr. Thomas A. McDill became the third president of the EFCA in 1976. His pastoral and administrative gifts were used by God to significantly strengthen the church during an unsettled and challenging time in American history. The movement grew dramatically under his leadership both in numbers and in its spiritual influence.

Dr. Paul A. Cedar served as the fourth president of the EFCA from 1990 until 1996. Dr. Cedar brought a passion for prayer, spiritual dependence, and evangelism to his leadership role. In 1996, Dr. Cedar left the EFCA to become the first full-time president of Mission America, a national networking and evangelism ministry.

Dr. William J. Hamel became the fifth president in June of 1997 and serves currently in that role.