Jim Tomberlin, Th.M., is an ordained minister who has served in a variety of ministries, including pioneering the multisite strategy at Willow Creek Community Church in Chicago. He is the founder of MultiSite Solutions, devoted to multisite and merger consultation.

Warren Bird, Ph.D., an ordained minister, is the research director at Leadership Network. He has conducted numerous interviews and surveys on topics of church restarts, church planting, multisites, and mergers, and is the coauthor of twenty-three books including Culture Shift, Viral Churches, and The Other 80 Percent, all from Jossey-Bass.