About Us
At Ad Astra Psychiatric Services, we understand that the path to healing and personal growth is not always easy. Inspired by the phrase Ad Astra Per Aspera—"Through hardships to the stars"—we recognize that life's challenges can be difficult, but they can also become opportunities for resilience, growth, and transformation.
Our team of professionally trained mental health providers is dedicated to supporting each individual's unique journey with compassionate, patient-centered, and evidence-based care. We believe that meaningful progress is always possible, no matter where someone begins. By partnering with our patients in a safe and supportive environment, we help them build practical skills, overcome obstacles, and move forward with confidence toward greater wellness.
Our Team
Allister Wilton
Allister Wilton is a ABPN certified psychiatrist with additional training certifications in Addiction Medicine and Internal Medicine.
Growing up in his mother’s rural medical practice, and seeing the difference that quality care could make in the lives of the community around him, was a significant factor shaping his views regarding medicine.
Medical Doctor (MD)-
Growing up in his mother’s rural medical practice, and seeing the difference that quality care could make in the lives of the community around him, was a significant factor shaping his views regarding medicine.
He went on to pursue his undergraduate studies at Rhodes College in Memphis, Tennessee, and subsequently his undergraduate medical education at the Medical University of South Carolina in Charleston, South Carolina. Following this, he completed combined residency training in Internal Medicine/Psychiatry, as well as a Fellowship in Addiction Medicine, at the University Of Iowa Hospitals And Clinics in Iowa City, Iowa.
He is passionate about delivering patient centered care that focuses on the individual, and strives to meet his patients where they’re at, respecting the diversity of one’s own lived experiences. He believes that medical care should be compassionate, empathetic, non-judgmental, and seek to enhance the patient’s quality of life through holistic means.
Thomas Larson
MSN ARNP PMHNP-BC
Thomas is a Psychiatric Nurse Practitioner and has over 18 years of experience in healthcare. He brings a deep commitment to compassionate, patient-centered care.
Thomas has spent the past 8 years working as a registered nurse and the last 3 years as a psychiatric nurse practitioner, providing comprehensive mental health services to individuals across the lifespan. Thomas received his education from Walden University.
Psychiatric Nurse Practitioner-
Growing up in his mother’s rural medical practice, and seeing the difference that quality care could make in the lives of the community around him, was a significant factor shaping his views regarding medicine.
He went on to pursue his undergraduate studies at Rhodes College in Memphis, Tennessee, and subsequently his undergraduate medical education at the Medical University of South Carolina in Charleston, South Carolina. Following this, he completed combined residency training in Internal Medicine/Psychiatry, as well as a Fellowship in Addiction Medicine, at the University Of Iowa Hospitals And Clinics in Iowa City, Iowa.
He is passionate about delivering patient centered care that focuses on the individual, and strives to meet his patients where they’re at, respecting the diversity of one’s own lived experiences. He believes that medical care should be compassionate, empathetic, non-judgmental, and seek to enhance the patient’s quality of life through holistic means.
PA
Devin received his Physician Assistant education at the University of Iowa Carver College of Medicine. For over seven years he has provided caring, personalized psychiatric care to adults. He is passionate about helping people navigate life's challenges and believes that everyone deserves to feel heard, supported, and understood.
Throughout his career, Devin has worked in a variety of psychiatric settings, including general outpatient psychiatry, emergency psychiatry, consult liaison psychiatry, and interventional psychiatry. These diverse experiences have given him a broad understanding of mental health care and the ability to support patients with a wide range of needs and diagnoses.
Psychiatric Physician AssociateDevin Keenan
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Growing up in his mother’s rural medical practice, and seeing the difference that quality care could make in the lives of the community around him, was a significant factor shaping his views regarding medicine.
He went on to pursue his undergraduate studies at Rhodes College in Memphis, Tennessee, and subsequently his undergraduate medical education at the Medical University of South Carolina in Charleston, South Carolina. Following this, he completed combined residency training in Internal Medicine/Psychiatry, as well as a Fellowship in Addiction Medicine, at the University Of Iowa Hospitals And Clinics in Iowa City, Iowa.
He is passionate about delivering patient centered care that focuses on the individual, and strives to meet his patients where they’re at, respecting the diversity of one’s own lived experiences. He believes that medical care should be compassionate, empathetic, non-judgmental, and seek to enhance the patient’s quality of life through holistic means.
LISW, LCSW, IAADC
Sarah is a Licensed Independent Social Worker (LISW), Licensed Clinical Social Worker (LCSW), and International Advanced Alcohol and Drug Counselor (IAADC). She earned her Master of Social Work from the University of Iowa School of Social Work, where she developed a strong foundation in evidence-based, client-centered care.
Social WorkerSarah Salamati
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Sarah currently works at the U.S. Department of Veterans Affairs (VA), providing mental health and substance use treatment to veterans facing a wide range of life challenges. This experience has strengthened her commitment to helping individuals build resilience, heal from difficult experiences, and achieve meaningful, lasting change.
Her clinical experience includes working with adults experiencing depression, anxiety, substance use disorders, trauma, sexual trauma, chronic pain, insomnia, emotional regulation difficulties, and major life transitions. She believes that every person has unique strengths and tailors treatment to meet each client’s individual needs, goals, and values.
She has specialized training in several evidence-based therapies, including:
Cognitive Behavioral Therapy (CBT) for Substance Use Disorders
Cognitive Behavioral Therapy (CBT) for Chronic Pain
Cognitive Behavioral Therapy (CBT) for Depression
Cognitive Behavioral Therapy for Insomnia (CBT-I)
Motivational Enhancement Therapy (MET) for Substance Use Disorders
Acceptance and Commitment Therapy (ACT) for Depression
Dialectical Behavior Therapy (DBT)
Written Exposure Therapy (WET) for trauma and post-traumatic stress
Her approach to therapy is warm, collaborative, and nonjudgmental. She strives to create a safe and supportive environment where clients feel heard, respected, and empowered to make meaningful changes. Working together with her clients, she helps develop practical tools to navigate life’s challenges, strengthen emotional well-being, and achieve the goals that matter most to them.
Empowering growth, fostering resilience, and supporting healing.
