Senior Leadership Team

Randy Derheim

Interim CEO


Randy Derheim has assumed the Interim CEO role after serving as the Chief Volunteer Officer since February 2017. Randy's career in business includes 21-years in various leadership positions at Citibank, 12-years of being a partner in Pinnacle Hospitality, Inc. and now semi-retired working as a Food Ambassador taking care of the nutritional needs of patients at Avera-McKennan. A veteran of the U.S. Navy and graduate of Brown Institute, Randy's hobbies include golf, creative writing and volunteering for the Augustana University Women's Golf Team.


Randy is married to Pam, his wife of 28 years.

Mark Sherman

Finance Director


Mark Sherman joined our team after spending three years working in public accounting as an audit associate for Eide Bailly in Aberdeen, SD. Mark obtained a Bachelor’s Degree in Professional Accounting from Northern State University in 2013. Mark grew up in Goodwin, SD and enjoys all sports especially baseball, football and wrestling. In his spare time he enjoys traveling with his wife Katie and watching his favorite teams the New York Yankees and Indianapolis Colts. 

Ellen Stewart

Human Resources & Administrative Support


Ellen attended the University of Sioux Falls and has a degree in Social Work. She has now settled in Sioux Falls with her husband, Gordon, and their three children, Ember, Moses and Ransom. Outside of work, Ellen is involved in youth and women’s ministry and advocates for different areas of tribal policy.

Ashley Wolf

Marketing Director & Fund Development Support


Ashley joins us after spending eight years at the Aberdeen Family YMCA in Aberdeen, SD. Leaving her position as the Senior Director of Youth Development in the fall of 2017, she previously led the departments of Membership, Marketing, Youth Development, and Aquatics. Ashley is a Multi-Team Leader through the YMCA of the USA. She obtained a Bachelor's Degree in Sports Management through Southwest Minnesota State University in 2009.

In her spare time, Ashley enjoys spending time with her husband Brad and their two children. 

YMCA Camp Leif Ericson Leadership

Mike Murphy

Executive Director


Mike has been involved with camp since 1997 and has served as Director since 2013.  Mike was born and raised in Sioux Falls and attended South Dakota State University where he earned a Bachelor of Science Degree in Biology and a Bachelor of Science Degree in Civil Engineering.   He is also a registered EMT-B and ACCT Level II Challenge Course Facilitator.  As a former camper, Mike loves to share the YMCA Camp experience with others.  When he is not at camp, Mike enjoys spending time with his wife and son, running, and volunteering in the community.  

Childcare Leadership

Sarah Skarski

Child Development Center Director


Sarah has several years of YMCA experience working directly with children of all ages, particularly six weeks through five years old. Working with and teaching children is truly her passion.  Sarah holds two Bachelor's Degrees, one in Early Childhood and the other in Elementary Education, each from the University of Northern Iowa.  Sarah and her husband, Jeff, reside in Sioux Falls with their three children. 

Bobbi Tellinghuisen

Youth Development Coordinator - Y-CLUB Afterschool Programs


Bobbi is a North Dakota State University graduate with a Bachelor of Science in Human Development and Family Science, where she spent 5 years at the YMCA of Cass and Clay Counties. She spent two years as a staff at a child care site, two as a site supervisor and one as a site director. She and her husband Justin were in Spencer Iowa for just over a year, where they added their Husky puppy Mya to the family. She enjoys reading, being on the water, taking Mya on runs, and anything else she and Justin can do outdoors together. She is very happy to be with a YMCA family!

Downtown YMCA Leadership

Sarah Wittrock

Senior Program Director


Sarah has been with the Sioux Falls Family YMCA since July 2013, previously serving with the YMCA of Greater Kansas City.  After receiving her degree in elementary education, Sarah served several churches as a Director of Christian Education overseeing and developing children's, youth, and adult programming in Iowa, Kansas and Michigan. She has a passion for youth and helping them to grow mentally, physically and spiritually.  In her spare time, Sarah enjoys spending time outdoors camping, hiking and biking with her husband, Chris, and four-legged baby, Grace Rose.

Melissa Kirby

Healthy Living Coordinator


Melissa's perspective on health and creative spirit have led to a life-long pursuit inspiring people to reach their full potential through mindful living.  She holds a Bachelor of Arts Degree in Health Arts & Sciences with an emphasis on Holistic Health from Goddard College in Vermont.  She holds certifications in Prana Flow Yoga with Shiva Rea and is a Certified Wellness Coach and NIA Instructor.  Melissa enjoys spending time with her family, running, teaching yoga and living a healthy-outdoor centered lifestyle.  

Dylan Hall

Youth Sports Coordinator


Dylan joins the Sioux Falls Family YMCA team after working six years at the YMCA in Mason City, IA. Dylan has worked with youth of all ages and abilities. He received his Bachelor's Degree in Organizational Leadership: Human Services from Buena Vista University in 2017. Dylan loves many different sports, but his favorite is football and he is an avid Green Bay Packers fan. In his free time, he enjoys spending time with his fiance, Brittany, and their two dogs (Bella and Tucker).

Terence Williams

Youth & Teen Program Coordinator


Terence attended Oklahoma Panhandle State University and graduated with a Bachelor of Science in Health & Physical Education. Over the last 5 years, Terence resided in Guymon, Oklahoma, while being there, he gained a passion for the Lord, and mentoring youth. In his free time, he loves to be around family, watch the San Antonio Spurs, and go fishing.

Emilie Kennedy

Youth Development Specialist


Emilie grew up here in Sioux Falls. She currently attends the University of South Dakota and will graduate in August 2018 with a Bachelors degree in Business Administration. Before coming to the Y, Emilie worked with children teaching gymnastics. She joined the Y when looking for a position she could commit to and grow into. Outside of the Y, Emilie is partner owner of Releve Studios in Sioux Falls and proud coach of the O'Gorman High School competitive dance team. When not working, she enjoys spending time with her family. Whether they are at their lake cabin or just hanging out at home, there's always something fun going on!

Association Support Team

Don Schmidt

Property Manager


Don is a YMCA career professional serving YMCAs in South Dakota, California, Nevada and Oregon.  Don has enjoyed the international aspect of the YMCA through partnerships with Costa Rica, Guatemala and Kobe, Japan.  Don holds a Bachelor’s of Science Degree in Sports & Recreation and an Master’s Degree in Education from the University of South Dakota.  He enjoys traveling and spending time with family.

Janell Slaight

Controller & HR Support


Janell initially joined the Sioux Falls YMCA as a member.  In October of 1984, she began working full-time in the accounting office as the assistant to the Business Manager.   In 1999, Janell was promoted to the Business Manager where she and her hard-working staff ensure that the financial integrity of the YMCA is maintained.  Her favorite part about working at the Y is being able to witness the positive impact that the programs have on the adults and children being served.  In her spare time Janell enjoys camping and spending time with friends and family.