Knowlton O'Neill & Associates PC Staff
Doctorate-Level Therapists
Evidence-Based Treatments
Most Insurance Accepted
Let the team at Knowlton O'Neill & Associates PC find a solution-based treatment program that will help you. Call us at (701) 364-0060 today for appointment availability.
Holly J. Hegstad, Ph.D.
Clinical Psychologist
Dr. Hegstad is a clinical psychologist providing cognitive-behavioral interventions. She provides treatment for anxiety disorders, including obsessive compulsive disorder, panic disorder, agoraphobia, simple and social phobia, and post-traumatic stress. She also maintains an interest in the treatment of hoarding, affective (mood) disorders, relationship stress, and impulse control disorders.
Dr. Hegstad received her doctorate through the University of North Dakota. She worked in community mental health for seven years. She is an Adjunct Instructor in the Department of Psychology at North Dakota State University and an Assistant Professor of Clinical Neuroscience at the University of North Dakota School of Medicine and Health Sciences.
Brenda L. Bratton, Ph.D.
Clinical Psychologist
Dr. Bratton is a clinical psychologist who provides cognitive-behavioral interventions to adults. She provides treatment for individuals with anxiety disorders, depression, adjustment disorders, and interpersonal problems.
She has a special clinical interest in integrative therapy (combining one’s faith in therapy), mindfulness, and acceptance-based interventions, particularly ACT (Acceptance and Commitment Therapy).
Dr. Bratton received her doctorate through Western Michigan University and completed her clinical psychology internship (APA approved) at Pine Rest Christian Mental Health Services in Grand Rapids, Michigan.
Dr. Bratton is certified by the PSYPACT Commission (APIT # 16332) to provide telehealth services to individuals in participating PSYPACT states. PSYPACT is an interstate compact that allows qualified psychologists to practice telepsychology and temporary face-to-face practice of psychology across state boundaries. For more information regarding PSYPACT and to see if a state is a member of PSYPACT, please visit www.psypact.org.
Katherine M. Schjeldahl, Psy.D.
Clinical Psychologist
Dr. Schjeldahl is a clinical psychologist. She provides cognitive and behavioral interventions for adults with mood and anxiety disorders and behavioral problems, with a special interest in generalized anxiety, social anxiety, separation anxiety, depression, panic, phobias, obsessive compulsive disorder, and post-traumatic stress.
Dr. Schjeldahl earned her doctorate through Roosevelt University in Chicago and completed her APA-approved clinical internship through the Nebraska Internship Consortium in Professional Psychology in Lincoln, Nebraska.
Caitlin Pollestad, Ph.D.
Licensed Psychologist
Dr. Pollestad is a licensed psychologist and certified sex therapist through the American Association of Sexuality Educators, Counselors, and Therapists (AASECT).
She works with a broad range of sexual health concerns, including but not limited to: questions and concerns related to sexual and/or gender identity, pain with sex, low libido, infidelity, sexual health concerns in monogamous and non-monogamous relationships, sexual exploration, sexual desire differences, and sexual dysfunction.
Dr. Pollestad provides cognitive-behavioral interventions to individual adults and couples. She believes treating sexual health concerns is a part of providing whole-person care, and doing so in a sex-positive way is crucial for our therapeutic relationship and your therapeutic outcomes.
Dr. Pollestad received her doctorate from the University of North Dakota and has experience working within integrated healthcare settings, including the Black Hills VA and medical and hospital environments.
Jenny K. Frissell, Ph.D.
Clinical Psychologist
Dr. Jenny Frissell is a clinical psychologist who provides cognitive-behavioral therapy for adults. She specializes in treating depression, anxiety, and adjustment disorders from an evidence-based perspective. Additional clinical interests include grief management, response to trauma, improving health behaviors in individuals with chronic medical diagnoses, and managing life transitions in older adulthood.
She is a certified prolonged exposure therapist and a certified exposure and response prevention therapist through the Center for the Treatment and Study of Anxiety at the University of Pennsylvania.. In addition to psychotherapy, Dr. Frissell provides psychological assessment services. She has over 20 years of clinical experience. She received her Ph.D. in clinical psychology from the University of Illinois at Chicago. She completed her internship at the Minneapolis VA Medical Center.
Cassandra M. Matejka, Ph.D.
Licensed Psychologist
Dr. Cassandra Matejka is a licensed psychologist and graduate of the University of Wisconsin-Milwaukee with her Ph.D. in Educational Psychology. She completed her APA-accredited internship in Clinical Psychology conducting diagnostic assessments, psychological evaluations, and providing therapy services for children, adolescents, and adults. Dr. Matejka provides comprehensive diagnostic evaluations and Attention Deficit Hyperactivity Disorder evaluations for individuals aged 4 to 21.
Dr. Matejka is currently accepting new patients. She utilizes evidence-based interventions to optimize therapeutic outcomes for mood disorders, anxiety disorders, and behavioral problems. Dr. Matejka is trained in Cognitive Behavior Therapy, Dialectical Behavior Therapy, Motivational Interviewing, Managing and Adapting Practice, and Parent-Child Interaction Therapy (PCIT). She finds it rewarding to help children and their families learn skills to navigate through difficult times on their journey to well-being. Contact the Knowlton, O'Neill and Associates office for more information on clinical services and insurance-specific questions.
Kjellann Loe-Johnson, MS, LPCC-S
Licensed Professional Clinical Counselor
Kjellann is a Licensed Professional Clinical Counselor and is licensed in both North Dakota and Minnesota. Specializing in Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), Motivational Interviewing, and Eye Movement Desensitization and Reprocessing (EMDR), she provides a comprehensive approach to mental health and well-being.
Kjellann's goal is to equip you with the tools and support needed to succeed on your own terms. Whether you're facing anxiety, depression, trauma, or relationship issues, she's here to guide you on your journey toward healing and growth. With a client-centered approach, Kjellann tailors her interventions to meet your unique needs and goals. Through collaboration and compassion, you'll work together to identify effective strategies and cultivate resilience. Kjellann looks forward to supporting you on your path to personal empowerment and fulfillment.
Josalyn Grueneich, FNP-C – AANP
Josalyn Grueneich has been a certified family nurse practitioner since 2019, obtaining her degree at the University of North Dakota. She has completed post-master's education for certification as a psychiatric mental health nurse practitioner. She provides pharmacological treatment and support for anxiety disorders, depression, insomnia, post-traumatic stress disorder, obsessive-compulsive disorder, binge eating disorder, bipolar disorders, and attention-deficit hyperactivity disorder. At this time, she is seeing new patients 18+.

Josalyn brings a unique perspective to this role. She spent 5 years as a primary care provider in a busy internal medicine department, caring for adults with various physical and mental illnesses. Josalyn has both professional and personal interests in psychiatric medicine. She is passionate about meeting people exactly where they are, no matter their background. She aims to come alongside individuals and give them tools in support of their mental health to improve their quality of life ultimately.
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