Meet Our Medication Management Team

Justin Gerstner, MD

Medical Director

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My goal as a psychiatrist is to help provide a firm foundation for someone to be who they want to be, and to achieve what they want out of life. To me, this is the very basis of Mental Health.

Every meeting is centered on developing a plan on how you can feel better. This includes identifying your current symptoms and diagnosis, walking through treatment options, and making decisions together.

I specialize in Psychiatry throughout the lifespan. My particular clinical interests are in mood disorders, anxiety disorders, and ADHD.

University of Wisconsin – Madison – MD

Licenses and Certifications
Medical Doctor (MD)
Board Certified in Psychiatry
Board Certified in Child and Adolescent Psychiatry

Natalie Carstenbrock, APRN, CNP

Director – Integrative Healthcare

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Natalie has a varied career in healthcare, which all started as a childhood dream of helping others. Following her graduation from nursing school, she worked as a registered nurse in a hospital before transitioning into family clinic practice. While working as an anti-coagulation nurse, her passion to bring changes to primary care led her back to school to pursue a life-long dream of becoming a certified nurse practitioner.

After gaining experience working across multiple medical settings, Natalie realized the need for a more holistic approach to medical care. Over the last few years, this understanding has regenerated her passion to fill the gaps in healthcare, and has informed her approach of treating the whole patient, with an emphasis on integrated emotional and mental health, rather than a condition. Natalie has provided comprehensive health care for patients of all ages, at all stages in life.

Natalie understands how difficult it can be to stay on top of it all, especially our health. She believes it is possible to combine therapy and medicine in order to create the best of both worlds. She has experience developing acute care programs within major medical systems and is thrilled to establish a supportive integrated medication management program alongside the world-class therapists and staff at Ellie Family Services!

The College of St. Scholastica, Master of Science, Family Nurse Practitioner

The College of St. Catherine, Bachelor of Science in Nursing

American Nurses Credentialing Center Board Certified Family Nurse Practitioner

Adam Klapperich, DO

Child and Adolescent Psychiatrist

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Dr. Adam Klapperich joined Ellie Family Services on October 8th, 2019 Originally from Aberdeen, South Dakota, he attended the University of South Dakota before graduating from the Kirksville College of Osteopathic Medicine. He completed psychiatric residency and child and adolescent psychiatric fellowship training at the University of Minnesota. Dr. Klapperich sees children and adolescents in the Woodbury Clinic. Dr Klapperich is also a consulting provider for the Psychiatric Assistance Line (PAL), which is a service you can share with your primary care provider to offer access to board certified adult and child psychiatrists for consultation.

Medical Degree: Kirksville College of Osteopathic Medicine, Kirksville, MO

Residency: University of MN, Minneapolis

Fellowship: Child & Adolescent Psychiatry, University of MN, Minneapolis

Board Certification: Adult Psychiatry, Child and Adolescent Psychiatry

Professional Memberships
American Psychiatric Association
American Academy for Child & Adolescent Psychiatry

Special Clinical Interests
Obsessive Compulsive and Impulse Control disorders


Psychiatric Medication Prescriber

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Patients can expect when meeting Nikita open-mindedness, compassion and honesty. Nikita specializes in PTSD, mood disorders, immigration,  and addiction.




Master of Science in Nursing

Licenses and Certificates:


Liz Braun, PMHNP-BC

Psychiatric Medication Prescriber

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Liz is a board certified psychiatric-mental health nurse practitioner (PMHNP-BC) who provides psychiatric evaluation and medication management services to patients ages 14+. Liz is passionate about working with her patients to provide the structure and support that enables them to create the best version of their lives, heal from past trauma, and attend to their mental health concerns. She believes that developing a solid therapeutic relationship with her patients plays an essential role in their pursuit of health and that the important work her patients do to improve benefits themselves, their families, and their community. Liz’s past experiences as a psychiatric nurse, emergency nurse, and sexual assault nurse examiner have provided her with a broad array of skills to utilize when working with her patients. She has experience working with patients across the lifespan who have survived trauma, grappled with chronic mental illness, and struggled with substance use. In her practice, Liz takes a holistic approach to medication management and works with her patients to use a variety of tools to attain mental wellness. She is an open, empathetic, and creative provider who is able to meet her patients where they are and to tailor a treatment plan unique to her patients’ priorities and needs.

Liz is interested in working with mood disorders, anxiety disorders, ADHD, OCD, and complex PTSD.


Vanderbilt University – MSN

Bellarmine University – BSN

Xavier University – MEd

Centre College – BS

License and Certifications

Certified Nurse Practitioner (CNP)

Registered Nurse (RN)

Psychiatric-Mental Health Nurse Practitioner, Board Certified (PMHNP-BC)

Emily Campbell

Psychiatric Medication Prescriber

Vivian Ngongang Ogunyemi, DNP, FNP

Psychiatric Medication Prescriber

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My goal is to meet you, understand your concerns or questions, make recommendations and together we come up with an acceptable treatment plan. I am an active listener, very engaging, empathetic, energetic and very welcoming. As a former bedside nurse, caring is the core to my practice. I incorporate evidence based practice with your socio-economic, and cultural background to create an individualized plan.

My specialty of interest are in mood disorders, anxiety, and ADHD.




Doctor of Nursing Practice

Licenses and Certificates

Board Certified Family Nurse Practitioner

Lola Oluwa-Okougbo, MS, PMHNP-BC

Psychiatric Medication Prescriber

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Growing up I wanted to be a special education teacher and work side by side with families struggling with the stress and burden that comes with it. I also grew-up in a culture that does not fully understand mental illness and the stigmatism of it kept mental health illness unspoken of. As I got older, I was drawn towards nursing to be able use my skills and knowledge to create mental health awareness. After becoming a Registered Nurse, I had many opportunities to experience other branches of nursing. My background and experience have further swayed me towards psychiatric nursing and becoming a Psychiatric Nurse Practitioner. I specialized in seeing all ages and my goal for becoming a Psychiatric Mental Health Nurse Practitioner is to provide holistic approach towards other’s wellbeing.

I believe that using my skills and knowledge to treat unique individuals with mental health issues will help improve their quality of life.

As a provider, I am a good listener and I make others feel comfortable in my presence. I show empathy and I respect patients’ value, beliefs, and opinions. I acknowledge patients’ presence and their courage for seeking for help. I develop a partnership with the patient to achieve their ultimate goal towards their wellness.

Yoruba (one of the most common spoken language in Nigeria)

Master of Science, PMHNP
Walden University

Licenses and Certifications
American Nurses Credentialing Center
Board Certified Psychiatric Mental Health Nurse Practitioner

Colleen Zimmer, MSN, PMHCNS-BC

Psychiatric Medication Prescriber

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Colleen’s career in psychiatry started by working as a registered nurse in a community mental health center. She supported individuals with a wide range of mental health needs. That experience provided the foundation for advancing her career and she obtained her advanced practice license. Due to the significant shortage of mental health providers with prescribing privileges, Colleen knew this was a vital piece needed to assist individuals towards mental wellness.

In a variety of settings throughout her career, Colleen has worked with populations who experience a range of mental health issues, people with chemical dependency issues and those with diverse backgrounds. She believes everyone has the right to access appropriate resources as they work towards mental wellness.

Colleen has an open, friendly approach to mental wellness. She understands each person has a life story to tell and actively listens, working together with the individual on their journey to wellness. Colleen takes a holistic approach taking into account psychological, physical and social aspects of each individual’s life. She believes every person is unique and therefore, deserves a unique treatment plan that works for their life.


University of Minnesota, Master of Science, Psychiatric Clinical Nurse Specialist

The College of St. Scholastica, Bachelor of Science in Nursing

American Nurses Credentialing Center – Board Certified Psychiatric Clinical Nurse Specialist

Marie Gaughan, CMA

Medication Management Assistant

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The overall dynamics of mental health is interesting to me. We cannot go through life without thinking, acting, or feeling. All three of these motions are affected by our mental wellbeing. The importance of mental health has on allowing those to live a healthy and balanced lifestyle is significant. I am excited to see the growth that each patient makes throughout their journey to a balanced lifestyle.

My career background has been focused on supporting patients throughout every stage of life: birth-geriatrics. I am excited to continue providing support to all ages at Ellie as mental health plays an important role throughout every stage of life.

Associates Degree – Medical Assistant
Dakota County Technical College

Certified Medical Assistant
Basic Life Support Certified
First Aid Certified

Caycee Olson, BA

Medication Management Assistant

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My interest in working within the mental health field started from wanting to impact others lives in a positive way to allow them to grow into the best versus of themselves. I have a passion for helping others on their journey through this thing we call life. I have always been someone who others can rely on to help when they are in need. My career background has focused on doing therapy with all ages on the Autism Spectrum. I grew into the medication management side for people and families of all ages over the last few years. My goal is to continue to assist those and their families with their mental health needs from all angles.


Bachelors of Arts from University of Minnesota – Duluth

Andrea Torres-Guerra, BS

Medication Management Assistant

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Clients can expect a smile on my face during my time with me. I work to create a comfortable environment prior to seeing their provider as well as hope to answer any of client’s medication questions or concerns in person or over the phone!

My specialties include working with children, adolescents, and adults in multiple setting including in-home, treatment centers, and out-patient. Also working with Spanish-speaking individuals and families.

Fluent in Spanish


Bachelors – University of Minnesota

Masters – Marriage and Family Therapy (current student)
Saint Mary’s University

Kelly Wallner

Medication Management Assistant

William Fry

Medical Scribe

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Serving the mental health needs of our community is a truly rewarding occupation. I am particularly interested in automaticity and the chasm of the unconscious. I had a brain aneurysm when I was ten years old, which rendered the left side of my body inert. Consciousness has always been a riddle of consequence to me.

Milwaukee Institute of Art and Design-BFA