Our Team

We are here to serve you.

  • Errin Mulberry – Lead Pastor/Elder

    I attended Cedarville University where I studied communications and Bible, and am pursuing my Masters in Ministry at Capital Seminary.  I have been serving in full-time ministry since 2001, most recently as an associate pastor at a church in Philadelphia.  I enjoy preaching, teaching, discipling, and counseling, and am excited to see how God will continue to use me for His glory.   My wife, Jennifer, and I have 4 children.  I love the Lord, my family, and the Philadelphia Eagles.  I enjoy riding motorcycles, peanut M & M’s, and churros from Taco Johns.   

    Email Pastor Errin

  • Aaron Crider – Student Ministry Pastor

    I answered the call to Calvary Baptist Church after serving in a church in western Pennsylvania for nearly a decade. I attained a B.A. degree in Communications Studies and Christian Education from Westminster College in 2015. My wife, Annaliese, and I have one daughter, Roselyn. Together we enjoy Legos, cooking, and spending time outdoors doing whatever we can. I love relationships and getting to know people and their stories. It is also this empathy and passion for relationship that fuel my drive in ministry. I am thankful to be here and look forward to many years as the student pastor.  

    Email Pastor Aaron

  • Kristi Schelhaas – Kids Ministry Director

    I graduated from Dordt University with a bachelor's degree in art and I am currently pursing my master's degree in Children and Family Ministry through Bethel University. I have served as a volunteer in kids ministry at Calvary for 15 years and I am excited to be stepping into the role of Kids Ministry Director. I look forward to coming alongside kids and walking them closer to Jesus, helping them establish an identity in who God says they are, and cheering them on as they go into this world and do great things for Him. My husband, Sam, and I have 3 kids. I enjoy going to sports events (Go Bucks, Gazelles, and Jacks!), trying new candy, and summer.

    Email Kristi

  • Marisa Thompson - Preschool & Daycare Director

    I attended the University of South Dakota where I studied Elementary Education. I received my Master’s Degree in Curriculum and Instruction from Mount Marty College. Before serving at Calvary, I taught Kindergarten for 8 years in the Yankton School District. Stepping into the role as the Preschool and Daycare Director will allow for me to continue my passion for education and children, but most importantly allow me to show each child how much they are loved by Jesus!

    My husband, Adam, and I have 3 kids. We enjoy days at the beach, rock climbing, hiking, bike rides, and family game nights.

    Email Marisa

  • Josiah Croom – Worship Coordinator

    I grew up in a small church near Fairmont, Minnesota.  My family instilled in me a deep desire to continually be serving in church. Music has been a major part of my life as long as I can remember. God eventually took me to Rockford, Illinois where I attended City First Leadership College to develop my skills in the worship world. I have a passion for setting an environment for people to encounter Jesus, and am so excited to do that here! I love quiet spaces, coffee, and a good burger.

    Email Josiah

  • Brian Brandt, Elder

    Brian and his wife, Stacy, have attended Calvary since 2003. Brian and Stacy have 3 children and live west of Yankton. Brian has served Calvary on the Trustee Board, led small groups, volunteered in AWANA, and youth ministry. Brian works as a Psychiatric Nurse Practitioner. In Brian’s free time, he enjoys spending time with family and farming at the family farm. 

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  • Jerry Gustad, Elder

    Jerry and his wife Amy live on a farm near Volin with their 4 children.  He works as an Engineer with Ehresmann Engineering. Jerry teaches Sunday School, helps with Awana is an usher and has served on the Trustee Committee in the past.  In his spare time he enjoys watching his kids in their various sporting activities.

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  • Ken Schaeffer, Elder

    Ken and his wife Lori have been attending Calvary since 2011. They have 3 grown children and 1 granddaughter. Ken is currently helping with Awana, adult community groups, the ushering team, and the church security team. He leads a mentoring program for boys and teens called Truth In Nature. Ken is a contractor. In his spare time he enjoys hunting and fishing.


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  • Sam Schelhaas, Elder

    Sam and his wife Kristi, along with their 3 children, live in Yankton and have been attending Calvary since 2005. Sam has worked for the South Dakota Game, Fish and Parks as a Conservation Officers for 20 years. Sam has been involved in Awana, Sunday School, and is currently a student ministry leader. He previously served on the Trustee Committee. Sam enjoys hunting and fishing in the Midwest and loves spending time with his family or watching his kids participate in their sporting events.  


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  • Drew Stevens, Elder

    Drew along with his wife Kathrine and two children live on a small acreage outside of Yankton. He works at Ehresmann Engineering managing Purchasing and Accounts. Drew has served in many areas of Calvary over the years, and is currently serving in youth ministries and on the worship team. He enjoys spending time out in God's creation hunting, gardening, and spending time with family.

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  • Ken VanEssen, Elder

    Ken and his wife Diane live in Yankton and have been attending Calvary since 2006. He retired in 2017 from being in the electrical industry for almost 50 years. He has 4 married children and 9 grandchildren. He currently serves with Awana, the ushering team, and the security team. Previously, he served 6 years on the Governing Board. In his free time, Ken enjoys hunting, fishing, and biking.

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