John H. Armstrong

John H. Armstrong is the president of ACT3 Network, a ministry for “empowering leaders and churches for unity in Christ’s mission.” John served as the senior pastor of two churches in the Chicago area for twenty years and began ACT3 in 1991, after a decade of leading an area-wide interdenominational fellowship for pastors. He is an ordained minister of Word and Sacrament in the Reformed Church in America (RCA) and the author/editor of thirteen books, including Your Church Is Too Small (2010) and Costly Love (2016). John has been married to Anita, his best-friend, since 1970. He has two adult children and four grandchildren.

John is an adjunct professor of evangelism and leadership at Wheaton College Graduate School (IL) and has taught and lectured in seminaries and colleges both in North America and abroad. He blogs at and writes the ACT3 Weekly, which can be accessed via John preaches widely and mentors leaders for unity in mission through the ACT3 Cohort Groups (cf. John also serves as a senior advisor to both the Christian History Institute and the Acton Institute. His passion is for creating places of hospitality where oneness can be experienced by all Christians (John 17:21).