YBC Mission Statement and Approach

"At Yellow Brick Clinic: ADHD, Autism, Developmental-Behavioral Health, we are committed to providing integrative, collaborative, and personalized health care for children, youth, and young adults with ADHD, Autism, and developmental-behavioral challenges. We have a vision to be a leading provider of meaningful care for individuals we see, and think "outside of the box" with patients so that they are an integral part of their health care plans.  We believe in offering traditional medical care  along with Integrative Medicine options and modern technologies, such as DNA testing for genetic disorders or medication compatibility.  Our goal is to help reduce barriers to provide: accessible care in the community healthcare setting; timely evaluations for developmental concerns and/or behavioral health struggles; and supportive, ongoing care with appropriate referrals for specialty services as needed." 

YBC: “Helping You Change Stumbling Blocks Into Building Blocks!"

With Telehealth through the Charm Health portal, we are accessible to patients throughout Washington State and Oregon.  New patients are evaluated with in-depth developmental-behavioral history, evaluation tools, and interaction with our Developmental-Behavioral specialized Nurse Practitioners.  Since each person is a unique individual, we care for each with fresh eyes,ears, and ideas.  We offer a variety of testing and/or therapy options that drive long-term goals and successful treatments.

Our Story

Yellow Brick Clinic: Integrative ADHD, Autism, Developmental-Behavioral Health


Yellow Brick Clinic: Integrative ADHD, Autism, Developmental-Behavioral Health (YBC) is a novel, community-based clinical practice that was created to offer increased access to care for people with autism and other developmental-behavioral challenges across the lifespan in Washington State.  Our mission is to “Change Stumbling Blocks into Building Blocks” for people with developmental-behavioral challenges.  Our model of care intertwines specialty-trained Advanced Registered Nurse Practitioners (ARNPs) and Telehealth to increase accessibility and offers both pharmacologic and complementary and alternative medicine (CAM) options.

The spirit of YBC was inspired in part by my young adult child with autism who told me, “Are you kidding? I hated going to clinics as a kid, I still do…the smells, the lights, all the people!”  In the beginning, YBC patients were seen in a scent-free, low-lighting, wood-floored, home-like clinic space with fun toys.  My daughter thought that people with autism might like the unique clinic environment and only seeing “one face” providing their care.  Knowing my affinity for The Wizard of Oz, and the clinic’s proximity to “the Emerald City” (Seattle, WA), my daughter suggested the name “Yellow Brick Clinic.”  With her lived experience and input, and an idea for a model of care that might increase access for care and decrease disparity, the “shingle” was hung -- literally!

YBC offers fairly short wait times, and most everyone referred or who self-refers is “screened in”, as we believe each person’s concerns are usually valid and should be at least addressed and referred when appropriate. As the clinic practice has grown, we continue to offer patients a personalized, holistic approach to care and participate in virtual IEP meetings and community-based team meetings for complex patients. Virtual YBC Team members able to understand the challenges of parenting and special needs help patients/parents with registration and scheduling.  The YBC scheduling team not only manages the schedules, but also provides assistance and reassurance to incoming patients and their families.  With the pandemic, this model of registration has been invaluable, and the YBC Team works well together, with each person’s input contributing directly to the workflow method. We have a culture of innovation - each individual’s perspective is valued, and team members are explicitly encouraged to bring forward their ideas and have them vetted for implementation.  As a Center of Excellence for Autism, we also participate in ECHO Autism: Washington State for continuing education and professional networking.

Telehealth was implemented early on for follow-up visits to allow patients an option to reduce both travel and patient/caregiver stressors. With the COVID-19 pandemic, telehealth quickly became the only mode for care at YBC and we adapted from using in-person developmental testing to online options and telehealth delivery methods. Behavioral Health screening forms were also digitalized and are attached with every visit to assess for ongoing anxiety and depression. This novel model of care has now become so comfortable for all that it is here to stay! We are able to provide care from the borders of Canada to the borders of our neighboring states, and we love and learn so much about patients by making telehealth “house calls.”

The need for autism and/or ADHD evaluation is not just for children, however, so as parents asked for their own assessments and care, this then extended to other adults who are questioning autism or ADHD for themselves.  Many young adults come with years of psychiatric history and failed medication trials, but may benefit from simplified care plans in the context of newly-diagnosed autism.  Caring for adult patients with autism teaches us more about caring for children and vice versa!  We have found the young adult neurodiverse population often responds well when given the same medical treatment as their "10-year old selves"; rather than utilizing heavier psychiatric medication, much of the time we opt for treating ADHD and anxiety first, making recommendations for collaborative care ideas for their primary or specialty care team to continue.

The YBC Team is so happy to be able to work with such wonderful, interesting, and diverse individuals and families!
Thank you to all who have contributed to making this community developmental-behavioral practice idea such a fantastic reality! Dr. Kat, ARNP

Meet Our Developmental-Behavioral Nurse Practitioners


Dr. Kathleen Johnson, DNP, ARNP, FNP-BC, C-PMHS

Dr. Mandie Gardner, DNP, ARNP, PMHNP

Dr. Mandie Gardner, DNP, ARNP, PMHNP

NP Lynn Mulheron, MS, ARNP, FNP-C, ENP-C, PMHS, CFMP

Dr. Kathleen Johnson, DNP, FNP-BC, C-PMHS, "Dr. Kat" (she/her),  is board-certified as a Family Nurse Practitioner (FNP) and  Pediatric Primary Care Mental Health Specialist (PMHS)...and soon will add a Psychiatric Mental Health Nurse Practitioner (PMHNP) certificate as well.  Dr. Kat brings special care for children through college-aged youth who face developmental-behavioral pediatric health challenges, which initially stemmed from pediatric focused nursing and parenting. Dr. Kat has a love of Holistic Caring, and integrative medicine seems to be a natural pairing for a developmental-behavioral specialist. Dr. Kat has specialty education that includes: University of Washington LEND Community Fellowship (Leadership and Education in Neurodevelopmental and Related Disorders), ADOS-2 and STAT for autism assessment, and Continuing Education with autism, ADHD, behavioral health, functional/integrative medicine, and connective tissue disorders.  Dr. Kat is active with the Society for Developmental Behavioral Pediatrics, regional and international professional groups, and teaches Pediatrics in Community Care (with extra Developmental and Behavioral Pediatrics) to Family Nurse Practitioner students at Pacific Lutheran University (PLU). She enjoys bringing a full spectrum of health care options together for optimal outcomes and believes every person has unique gifts. Dr. Kat has four children, with many years of exciting parenting experiences, as well as strong faith in God and a love for gardening, sailing, and dark chocolate!  Something quirky about Dr. Kat is that she went to the Land of Oz Theme Park in Boone, NC as a child (and held Dorothy's hand on the Yellow Brick Road!!!) and she loves 60s and 70s music...Mr. Blue Sky by Electric Light Orchestra (ELO) is her go-to "happy song".

Dr. Mandie Gardner, DNP, ARNP, PMHNP (she/her) is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) with a dedication for working with children through college-aged youth who have developmental-behavioral health challenges.  "Dr. Mandie" has Center of Excellence for Autism certification and is participating in the UW ECHO Autism  CEO professional group, as well as pursuing more integrative mental health knowledge. She brings experience from 10+ years as a Registered Nurse, which include being a case manager, nurse educator, court liaison, and nurse manager, and psychiatric pediatric-adolescent inpatient care. These nursing experiences inspired Dr. Mandie to become a Nurse Practitioner and work with children and youth, with a goal to help them have early access to community health care and prevent more life-impacting mental illness effects.  Additionally, Dr. Mandie brings nursing experience with Type 1 Diabetes, which is often has childhood onset and can impact growth and development. Prior to coming on staff at YBC, Dr. Mandie apprenticed with Dr. Kat for a year,  gaining insight with developmental-behavioral patients.  Dr. Mandie brings a thoughtful, caring, and interactive approach to working with her patients in Telehealth, as well as a great sense of humor!  Family is Dr. Mandie's greatest joy, enjoying life's adventures with her husband, two children, three cats, and three dogs. She loves hiking and nature, large bodies of water, and big stormy weather!  Something quirky is that she loves sitcom theme songs..."Have you ever listened to the whole Cheers theme song?"(Dr. Mandie).

NP MariLynn “Lynn” Mulheron, MS, ARNP, FNP-C, ENP-C, PMHS, CFMP (she/her) carries a number of board certifications: Family Nurse Practitioner, Emergency Nurse Practitioner, Pediatric Primary Care Mental Health Specialist, and Certified Functional Medicine Practitioner. Lynn has been an RN since 1994, and an FNP since 2003, and worked in 5 states and many settings. As a lifelong learner, she is currently working on a PMHNP certificate and DNP, and interested in a genetics/genomics certificate. Lynn is also a "Center of Excellence for Autism" provider and participates with professional groups for both autism and Ehlers-Danlos Syndrome (EDS) to continue gaining clinical knowledge to share with patients and families. She has special interests in pharmacogenetic testing, genetic testing for connective tissue disorders, and integrative medicine. With YBC, Lynn is working with adolescents through young adult patients, and enjoys helping complex patients navigate overlapping challenges, such as autism and ADHD, while understanding hEDS, MCAS, and POTS.  She believes that having as much information as possible helps people decide best how manage health, find their strengths, and live their best life...whatever challenges the issues may bring! Lynn makes an effort to listen to the concerns of her patients, and it is her goal to address challenges as a team with her patients while integrating functional medicine approaches. With providing Telehealth services, Lynn's cat Portia makes guest appearances. Lynn enjoys quilting, singing, can’t wait to get back to traveling...she has been to 50 US states and 28 countries. Something quirky about Lynn is she has a near-obsession with the 24 hour bear-cam that runs each summer on the grizzly bears eating salmon in Katmai, Alaska, and her love of the insect world. She also spent a year studying caddisfly larvae, and at times is summoned to evict a scorpion or other noxious critter from family and friends’ homes and in the workplace.

Next Steps...

If YBC can be part of your wellness team, please have your PCP/Pediatrician FAX a referral to 833-631-6941!

Once our Administration Team receives that they will be in contact. Parents may email if seeking care for their children, but adults seeking evaluation services must have a PCP referral.

Please be patient and kind with the YBC Team as we are all working remotely to serve families in the Northwest!

  • YBC Phone: 425-777-5467
  • Dr. Kat's Cell: 425-736-9609
  • Fax: 833-631-6941