Board of Directors
Olivia Siglin, C.O.R.E. Board of Director – President
Jackie McPherson, C.O.R.E Board of Director – Vice President
Jackie brings many years experience in the legal and education fields. She is currently employed by the Douglas School District as the Administrative Assistant. She has worked many years with kids as a 4-H Advisor and Youth to Youth Advisor. Jackie is a board member for C.O.R.E. and has the challenging work of book keeping for C.O.R.E. as well. She is inspired by observing the students faces and hearing their remarks as they go through C.O.R.E.’ s programs. Jackie has seen kids lives saved and changed because of this program and what it brings to the communities it serves. She whole heartedly believes in the program. If she has spare time she enjoys her 12 grand children and gardening.
Amanda Allcock, C.O.R.E. Board of Director – Treasurer
Amanda Allcock is currently the Director of Sales, Marketing, and Tourism at Crazy Horse Memorial Foundation. Amanda grew up in Colorado and graduated with a B.A. from the University of Colorado. She and her family moved to Black Hills of South Dakota in 1990. She has been employed for Crazy Horse Memorial® since 1997 and has a passion for the project. She is on the Custer Chamber Board and the Custer Chamber of Commerce. Amanda began her relationship with C.O.R.E. in the winter of 2013 when the Southern Hills Program was looking to move their program to a larger facility. She is passionate about Freshman Impact and strongly believes that the program and core values have the ability to change young lives and help the community in a positive way and is honored to serve on the Board. Whenever the opportunity arises, Amanda enjoys her 2 daughters, twin grandsons and granddaughter along with traveling, hiking and enjoying the beautiful Black Hills.
Jeremy Milstead, C.O.R.E. – Secretary
Jeremy currently serves as the supervisor for the Pennington County Sheriff’s Office School Resource Officer team. Jeremy has worked in law enforcement since 2013 and served in the military prior to his career in law enforcement. Jeremy is a firm believer in the mission of C.O.R.E. and is passionate about the impact programs like Freshman Impact® have on the youth of our communities across South Dakota. Jeremy is originally from South Dakota, graduated from Minnesota State University with a B.A., and completed his Master of Arts in Executive Leadership through Liberty University.
Tanya Grassel-Krietlow, C.O.R.E. Board Member
Tanya, an enrolled member of the Lower Brule Sioux Tribe, grew upon the Lower Brule Indian Reservation in South Dakota. Tanya became a mentor for students transitioning from the St. Joseph’s Indian School to the Chamberlain High School in the 80’s beginning her commitment to advocating for Native Americans. Tanya has been privileged to work with Native Americans and their families for over 30 years. She has experience working with juveniles and adults in counseling, human services, education, law enforcement, health care, and grants management. Tanya’s first job was at an off-reservation boarding school for Native American students grades 6-8. She later joined United States Probation Pre-Trial Services and worked on 7 of the 9 reservations in South Dakota. She also worked for Urban Indian Health, Lower Brule Community College, and a tribal non-profit in Lower Brule. Tanya currently works for the South Dakota Network Against Family Violence and Sexual Assault as the Cultural Programs Manager and works primarily with tribal partners and partners serving high populations of Native Americans across South Dakota.
Mark Naugle, C.O.R.E. Board Member Education Advisory
Mark has had a rewarding career in education since 1988, starting as a teacher and coach, then as an Athletic Director, then as the Superintendent of Hill City School District, and currently, as Superintendent of the Custer School District. Mark serves on the Executive Board of the South Dakota School Superintendents Association, the American Association of School Administrators National Governing Board, the FLISA Impact Aid Organization National Executive Board, the South Dakota High School Activities Association Budget Committee, and the Calendar Committee. In 2024, Mark was awarded the 2024 Outstanding Superintendent of the Year award from the SDSSA. Mark has been/is a Board Member for the Custer Chamber of Commerce, the Southern Hills United Way, Freshman Impact®, Custer County Historical Society & 1881 Museum, Custer Economic Development Corporation, and the Hill City Economic Development.