Our Nurse Practitioners

Katherine Leatherman
Psychiatric NP-BC, MSN, MPH, PhD Pursuant
Owner & Provider
Katherine is a board certified psychiatric nurse practitioner who specializes in child and adolescent mental healthcare. She is one of the experts in the field and provides in-person appointments to families in the Eugene/Springfield area. Katherine has been in the nursing profession for 8 years with a background in women's health, prenatal and postnatal care, inpatient and outpatient eating disorder treatment, and pediatric psychiatry. She attended NW Christian University for her nursing degree then went on to attend Benedictine University in Lisle, IL for her MPH with a certificate in Health Management & Policy. Katherine pursued her Nurse Practitioner education at Frontier Nursing University in Versailles, KY with a specialty in Psychiatry. She decided to practice psychiatry in her hometown and has served both children and adults in the Eugene/Springfield community. Katherine now specializes in the child and adolescent population and offers comprehensive psychiatric assessments, medication management, and psychotherapy to patients and their families. She is currently pursuing her PhD at Oregon Health & Sciences University with a research focus on child circadian rhythms and exposure to various media platforms. In her free time Katherine is with her dogs, Norman and Dolly, who are a dachsund and corgi duo. She values family and comes from a family of 5 siblings. She is an aunt to 4 nieces and 6 nephews who keep her world lighthearted. Katherine opened St. Rita Psychiatry with the vision to treat and manage child psychiatric conditions with tenderness and lightheartedness. As a master in psychopharmacology, Katherine provides precise medication management which ensures effective and efficient treatment of symptoms and reduces risk for side effects. She treats all child mental health disorders including depression, anxiety, ADHD, behavioral disorders, PTSD, eating disorders, OCD, bipolar disorder, autism spectrum disorder, and more.

Renee Arreola
DNP, Psychiatric NP-BC
Provider
Renee is a Psychiatric Mental Health Nurse Practitioner (PMHNP) with nearly two decades of experience in nursing and a deep commitment to equitable access to mental health care. She earned her Bachelor of Science in Nursing from Oregon Health & Science University, Klamath Falls Campus, her Master of Science in Nursing, Psychiatric Mental Health Nurse Practitioner track, from Gonzaga University, and recently received her Doctor of Nursing Practice (DNP) from Oregon Health & Science University, completed June 2026. Renee holds Advanced Practice Registered Nurse (APRN) certification through the Oregon State Board of Nursing and board certification through the American Nurses Credentialing Center (ANCC). She also holds the Certified Autism Spectrum Disorder Clinical Specialist (ASDCS) and ADHD-Certified Clinical Services Provider (ADHD-CCSP) credentials, reflecting her specialized expertise in neurodevelopmental care. Her clinical background spans post-surgical nursing, Tribal Health, and over 13 years serving rural and underserved communities through Health Resources and Services Administration (HRSA)-designated sites, work rooted in her own upbringing in rural Oregon. For the six years prior to becoming a PMHNP, she served as a nursing administrator at a nonprofit adolescent residential sub-acute treatment and evaluation facility in Eugene, Oregon. Throughout her career, Renee has been drawn to the intersections of complexity and inequity in psychiatric care, with a practice that encompasses adults, children, adolescents, and geriatric patients. Her clinical focus has deepened considerably around neurodevelopmental conditions particularly Autism Spectrum Disorder (ASD), Attention Deficit Hyperactivity Disorder (ADHD), and the broad spectrum of comorbid diagnoses that accompany them, including anxiety and conditions associated with emotional dysregulation. Her DNP scholarly work examined gender differences in ASD presentation, common ASD-associated phenotypes, and co-occurring diagnoses, contributing to a growing body of evidence addressing how profoundly these conditions are underdiagnosed, mischaracterized, and underserved, particularly among populations already facing systemic barriers to care. Her clinical and research interests include adolescent and community mental health, ADHD, trauma-informed care, early autism identification, and resource attainment for autistic individuals and their families. She is particularly interested in the integration of psychotherapy and skills-based interventions alongside pharmacological treatment, and in reducing systemic barriers that delay diagnosis and limit access to services. Renee is a strong advocate for reducing stigma in mental health care and approaches her work from a holistic, person-centered philosophy grounded in the belief that mental health is inseparable from overall wellness and that every individual's story matters. She has intermediate proficiency in Spanish, supporting her work with diverse patient populations.

Brian Troutz
Psychiatric NP-BC, MSN
Provider
Brian is a board certified Psychiatric Mental Health Nurse Practitioner. He completed his original nursing degree in 2014, received his Bachelor of Nursing Science from Bushnell University and his Master of Nursing Science from Gonzaga University. Brian’s has a background working as a psychiatric nurse in the hospital setting and also as an occupational health nurse. He understands the importance of a holistic approach to his patients mental health needs. Prior to becoming a nurse, Brian worked with a local crisis response team where he encountered many individuals from all walks of life who were experiencing a wide range of mental health issues. This experience instilled in him the desire to help those who are struggling with their mental health. Brian treats mood disorders, including depression and anxiety, bipolar disorder, schizophrenia spectrum disorders and ADHD. He utilizes supportive therapy, cognitive behavioral therapy, motivational interviewing, mindfulness techniques, medication management and referral for psychotherapy when appropriate. He will work with you to develop a treatment plan tailored to your unique needs. Originally from Texas, Brian has lived in Oregon for 17 years. In his spare time, he enjoys jogging and watching sports, going to the coast and spending time with his three cats and one chihuahua.

Diana Hall
Psychiatric NP-BC, Pediatric NP-BC, MSN
Provider
Diana Hall is a dual board-certified nurse practitioner with eight years of experience providing pediatric primary care in the Portland area. She is excited to now focus her work in psychiatric-mental health, continuing her commitment to supporting children and adolescents. Diana earned her Master of Science in Nursing from Yale University and completed her Psychiatric-Mental Health Nurse Practitioner training at Johns Hopkins University. Her background in pediatrics informs a thoughtful, developmentally attuned approach to care. She has a special interest in working with children and adolescents experiencing trauma and complex PTSD, ADHD, depression, and suicidality. Her style is warm, collaborative, and goal-oriented, with an emphasis on individualized care that may include medication management and supportive strategies for emotional regulation. Diana is dedicated to creating a compassionate, nonjudgmental space where patients and families feel supported and understood
Our Therapists

April Clark
LPC, MA
Child and Family Therapist
"Dr. Gabor Mate’s work teaches that human beings are social creatures and are naturally ‘wired for connection.’ In his book, What Happened to You?, Dr. Bruce Perry writes, ‘The capacity to love is at the core of the success of humankind…isolated and disconnected, we are vulnerable.’ As a therapist, I believe that the core responsibility of my job is to help people feel seen and emotionally supported as they confront and overcome life challenges and letting go of dysfunctional learned patterns of behaviors. I have witnessed how profound and inspiring it can be for authentic, non-judgemental, compassionate human connection inspires people towards personal growth, being able to fully see themselves, and fully embrace their healing journey.” Through attending Pacifica Graduate Institute from (2008-2010) to obtain her Master of Arts in Counseling and Depth Psychology, April engaged in coursework relating to family systems, various psychological theoretical orientations, human development, ethics, psychopathology, and multi-cultural disciplines through the lens of the Fathers of Psychoanalysis and experts in Jungian and Depth Psychological therapy. This educational experience provided April a theoretical framework combining mindful operation in the world with a focus of living authentically. April’s clinical expertise is grounded in evidence-based and integrative modalities. Her primary therapeutic approaches include Depth and Jungian Psychodynamic methods, Person-Centered therapy (Rogerian), expressive arts, mindfulness, and Collaborative Problem Solving. She holds certifications from PSU in Foster and Adoption Family Therapy and Therapeutic LifeStory Work, and she is trained in attachment-based EMDR. Additional training includes SandTray, Play Therapy, Art Therapy, Collaborative Problem Solving, Child Parent Psychotherapy (CPP), and she is currently training in Exposure and Response Prevention (ERP), Internal Family Systems (IFS), Relational Life Therapy, as well as working with ADHD and eating disorders. Over the years, April has held various roles across academic, community, and clinical settings, including serving as an adjunct instructor at Brown Mackie College in Boise Idaho, an Intensive Community Treatment Services (ICTS) therapist at The Child Center in Springfield Oregon, a Primary Therapist at Rain Rock Residential Treatment Center, and an Individual and Family Therapist at the Center for Family Development (2015-2022) and then at Joyful Living Behavioral Health (2023-2025), providing individual and family services to children, teens, and adults. In 2024, April began training for certification in Relational Life Therapy through The Relational Life Institute, and she initiated therapy dog training for Nadya, a Belgian Malinois/Doberman mix, to support clients in sessions. April enjoys mindful art practices, including creating her own tattoos, as well as tending to her chickens, and spending time with her family.

Nadya Clark
Therapy Dog
Nadya is 5 years old and has shown aptitude towards being a therapy dog since she was a puppy. She loves working with kids, and she enjoys interacting with adults who come for therapy, too. Nadya is still training with specific therapy interventions, with the goal of passing an AAAIP exam, but in the meantime she is loving being able to participate in animal assisted interventions through engaging with clients during sessions in her own special way. Nadya is curious, silly, and she can be very vocal. She enjoys sleeping, belly rubs, finding unique solutions to puzzle toys, and being able to outrun any other dog she is around!

Allison Fox
MSW, CSWA, LCSW candidate
Child and Family Therapist
Allison Fox, MSW, is a child and family therapist with a strong commitment to trauma informed, client centered care. She earned her Master of Social Work from University of Denver Graduate School of Social Work in 2022. Allison began her clinical work as an intern at Adapt Integrated Mental Healthcare, where she worked with adults and youth navigating mental health and resource challenges. In 2023, she transitioned to Douglas CARES, providing therapy to children youth and their caregivers, with primary focus on supporting traumatized youth and families all over Douglas County. Allison now lives in Eugene, Oregon and is excited to share her passion to serve in her new community as a Child and Family Therapist with St. Rita Psychiatry. Her clinical approach integrates evidence-based practices including Mindfulness, Cognitive Behavioral Therapy, Dialectical Behavior Therapy (DBT), Somaticpsychotherapy and Internal Family Systems (IFS). Allison has particular interest in working with individuals experiencing Dissociative Identity Disorder (DID), Post traumatic Stress Disorder (PTSD), and Complex PTSD. Allison is passionate about empowering individuals to build self-trust, deepen self-understanding, and move beyond survival toward a life of wholeness and fulfillment. She views healing as both a personal and collective process, recognizing the connection between individual well-being and the health of communities. Her work is grounded in the belief that meaningful change begins within, and that supporting each person's journey toward inner peace contributes to a more compassionate and resilient world. Allison likes birds, nature, and is a proud Aquarius.

Jessica Huiying Tull
LPC, MA, ADHD-CCSP
Clinical Group Facilitator
Jessica Huiying Tull is a passionate and experienced bilingual therapist (Mandarin Chinese & English) who earned her Master’s Degree in Clinical Mental Health Counseling from Bushnell University in 2020. She has extensive experience in community mental health, working with children, adolescents, and families from diverse cultural and socioeconomic backgrounds. Her past work includes collaboration with schools, the Juvenile Justice system, DHS, ORPARC, and Head Start of Lane County. Jessica developed a specialized parenting curriculum for families of children with mental health diagnoses, which continues to be used by community agencies today. She is currently pursuing licensure as a Registered Play Therapist and is trained in multiple evidence-based modalities, including play therapy, child-parent interaction models, trauma-focused CBT, and ADHD-specific interventions. She also provides diagnostic support through ADI-R assessments for autism spectrum conditions. Fluent in both Mandarin and Cantonese, Jessica is deeply committed to supporting immigrant families, fostering intergenerational communication, and helping individuals navigate cultural transitions. She primarily serves children and teens but also works with adults as needed. Her therapeutic approach emphasizes empowerment, emotional safety, and a strong, supportive connection with clients and their families.

Paula Carabell
PhD, ATR-BC
Clinical Group Facilitator
Paula is a board certified, registered art therapist, licensed in the state of Oregon. She also holds a Ph.D. from Columbia University in Art History and recently relocated to Eugene from New York. Paula's experience in art therapy has allowed her to work with a number of different populations, but regardless of the setting, she prioritizes the idea of process over product. This means that one doesn't need to be an artists to benefit from art therapy, but rather, just a willingness to let your imagination flow onto the paper. The meaning of your work is your own and is never determined by the therapist. Art therapy is a place to explore ideas and issues through imagery. It's also fun! Paula has also spent considerable time teaching art history on the university level. In reference to art therapy, sometimes it's even interesting to explore how other artists have expressed themselves throughout history. Besides taking the time to try to learn about Eugene, Paula loves to spend time with her dog, a Standard Poodle named Lavender who is a seasoned traveler, having ridden in the back seat all the way from New York City. Paula is looking forward to her new life in Oregon and getting to know the patients at St. Rita.
Our Medical Assistant

Kalie Durham
CCMA
Certified Clinical Medical Assistant
Healthcare has always been Kalie's purpose and passion! In 2024, Kalie obtained her CCMA license and moved to Oregon where she spent 18 months at Oregon State Hospital as a Mental Health Technician. Oregon State Hospital taught Kalie so much about mental health, the harmful stigma surrounding it, and the realities faced by people living with any diagnosis. According to Kalie, "I'm not here to judge, only to care." Kalie's hobbies include listening to music, baking, and reading. Oddly enough, Kalie's favorite color is St. Rita green!
Our Administrative Staff

Cece Winters
Cece is the office manager at St. Rita Psychiatry. She spent time working at an inpatient treatment facility before taking a job at St. Rita, and continues to incorporate what she learned from that experience to better serve patients here. When she isn’t working, Cece enjoys gardening, movies, and hiking with Lexi!
Office Manager

Isabel Testa
Isabel is an administrator at St. Rita Psychiatry. She is passionate about mental health and loves the opportunity to connect with patients. She also has experience working with patients in eating disorder treatment. In her spare time, Isabel enjoys cooking, spending time with her dog Emmy, and couponing.
Administrator

Alexis Winters
Lexi is the official greeter here at St. Rita Psychiatry. She is a 10 year old American Bully mix who loves to hike, snore, eat grass, and dig holes in her free time. She also loves her job at St. Rita, and takes it very seriously!
