Jim and Sheri are certified marriage mentors, marriage enrichment event teachers, ministry consultants and published authors, including Jim's contribution to Dr. Les Parrott's book, The Complete Guide to Marriage Mentoring and publication in Marriage Partnership magazine.

Jim and Sheri have served at their church for over ten years as pre-marriage mentors where they developed the evangelism component of their church's mentor training program and have taught and coached other marriage mentors and churches.

Married over thirty years, Jim and his wife Sheri have conducted marriage conferences in cities across the country and have committed their ministry to equipping and encouraging America's couples and churches to building healthy, biblical marriages. The Muellers live outside Chicago, and are the parents of two married daughters.