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Heartland Psychological Services
Meet Our Therapists
All of our therapists are professionally trained and accredited according to both state and national levels. Please take a moment to meet our compassionate, caring team.
Danelle Pennock, PsyD

Danelle is the Director of Heartland Psychological Services. She has been employed at HPS since 2009. Danelle received her Master's Degree and Doctoral Degree in Clinical Psychology from Argosy University/Illinois School of Professional Psychology in 2007 in Schaumburg, Illinois. Prior to being at HPS, Danelle worked for Liberty Healthcare Corporation as a Clinical Therapist. Danelle enjoys facilitating individual and family therapy interventions with children and adults.
Mary Sternhagen, LPC-MH

Mary received her Master of Arts in Counseling from the University of South Dakota in 2000. Prior to joining Heartland in March 2001, she directed the Women's Shelter and the Visitation Center in Yankton for six years. Mary enjoys working with veterans and their families. Mary's professional interests include eating disorders, victims of trauma, adjustment to physical illness including chronic and persistent pain issues, in addition to general practice using a very supportive approach with children through adult age individuals.
Tonja Koenigs, LCSW-PIP

Tonja received her Masters of Social Work degree from the University of Nebraska at Omaha in 1995. She has worked as a therapist at Lutheran Social Services in Sioux City, Iowa, and she has served as the Children Services Coordinator and later as the Executive Director of the West Iowa Community Mental Health Center in Denison, Iowa. Prior to joining Heartland in 2007, Tonja directed the Yankton Women's/Children's Center. Her strong background and experience were acquired by providing therapeutic services to adults, adolescents and children.
Sherry Gaskins, LCSW-PIP

Sherry received her Master's Degree in Clinical Psychology from Minnesota State University, Mankato, in 2013 and her Master's Degree in Social Work from the University of Iowa, Sioux City, in 2017. She completed her Clinical Psychology research internship at the Minneapolis Veterans' Affairs Hospital, exploring difficulties National Guard soldiers and their families experienced during and after deployment, along with exploring resiliency factors. She completed her Clinical Social Work internship at Lewis & Clark Behavioral Health Services in Yankton working with adult populations. Sherry has worked in various positions at South Dakota Human Services Center, Minnesota State University, and the University of Minnesota. Before joining Heartland in 2018, Sherry was employed as a Youth and Family Services Therapist at Lewis and Clark Behavioral Health Services. She enjoys a general practice utilizing supportive approaches for individuals of all ages.
Stephanie Kramer, LCSW-PIP

Stephanie received her Masters of Social Work Degree from the University of South Dakota in 2015. Over the years, she worked with Behavior Management Systems in Rapid City, Human Services Center in Yankton, and Here4Youth in Sioux Falls. Prior to coming to Heartland, Stephanie spent five years with Southeastern Directions for Life. Stephanie enjoys working with individuals to offer assistance with mental illnesses, addictions, aging, medical illnesses, fertility/postpartum care, trauma, developmental challenges, learning difficulties, and more. Stephanie enjoys utilizing general practice to offer person-centered treatment in a safe, accepting, nonjudgmental environment when working with teens and adults of all ages
Heather Salis, LCSW-PIP

Heather graduated with her BS in Psychology from North Dakota State University with focus on Child Development and Family Systems in 2000. She received her Master’s in Social Work from the University of St. Thomas/St. Katherine’s University in 2012. Over the years, Heather has had experience working with children and families in the foster care system and at Children’s Home Society of Sioux Falls for 12 years in both their community-based program and residential treatment program. Additionally, she has practiced in the field of medical social work with dialysis and cancer patients. Heather has volunteered in the past to provide support to children of incarcerated parents, survivors of rape and domestic violence, and families experiencing grief. She joined Heartland in September of 2019 where she enjoys a general practice utilizing supportive nonjudgmental approaches with clients of all ages doing both individual and family therapy. Her areas of focus include: anxiety, depression, trauma, ADHD, autism, grief, and social skills development.
Michaela Eskens, LPC

Michaela earned her Master of Arts in Clinical Mental Health Counseling at the University of South Dakota in 2022. Michaela interned at Heartland Psychological Services from 2021 to 2022 and has experience with children, adolescents, adults, and families in both individual and group settings. She is honored to journey alongside individuals as they navigate life's triumphs and challenges. Michaela enjoys a general practice and promotes a safe, accepting, and nonjudgmental environment for clients as they explore changes that can lead to a positive impact on their overall well-being.
Kaitlyn Conroy, LPC

Kaitlyn earned her Master’s degree in Clinical Mental Health Counseling from the University of South Dakota in 2022. Before joining Heartland Psychological Services in 2024, she worked in both adolescent inpatient treatment and community mental health settings, where she gained extensive experience supporting high-needs and high-risk children, adolescents, and families in individual and group settings. Kaitlyn has specialized training in play therapy and works with children and adolescents ages 4–18 in both individual and family formats. She supports clients experiencing developmental concerns, emotional dysregulation, behavioral challenges, and difficulties across home, school, and community environments. Her approach is individualized, strength-based, and child-centered. She strives to create a warm, positive, and exploratory space where clients can strengthen self-worth, deepen self-understanding, and build developmentally appropriate communication, regulation, and relationship skills. Kaitlyn values collaboration and works closely with parents, teachers, medical providers, and other key supports to promote consistency and growth across environments. At Heartland, Kaitlyn is passionate about providing a safe, supportive, and non-judgmental environment for children, adolescents, adults, and families. She is committed to meeting each client where they are and walking alongside them as they heal, grow, and move toward meaningful change.
Office Staff

L-R: Carin Huber, Business Manager; Michelle Paltz, Brooke Loutsch, Peggy Muhmel