Our Clinical & Support Team
At Center of Excellence, our team is dedicated to our patients success. Call 503.832.0945 or contact us anytime.
Get in TouchMeet the Team
At Center of Excellence
Clinical Staff
Dr. Simas is board-certified in Psychiatry and Addiction Psychiatry. He offers compassionate, personalized care for each patient. His special expertise is in the treatment of co-occurring mental health and substance use disorders. Dr. Simas opened the Center of Excellence in 2015 to better meet the tremendous community need. He is experienced in treating opioid use disorder with Suboxone®, and is a pioneering provider of telepsychiatry services.
Please note: Dr. Simas is not taking new patients at this time.
Ms. Weston is a board-certified lifespan Psychiatric Mental Health Nurse Practitioner specializing in all ages, including children and adolescents, the LGBTQ+ population, and prenatal/postnatal mental healthcare. She began her career as a therapist before becoming a nurse practitioner. She’s based in Ohio and provides telehealth services. She enjoys kayaking, traveling, and rooting for her Buckeyes and Browns.
Ms. Lambert is an Oregon native with extensive experience in outpatient and inpatient psychiatry. She brings a background in therapy to her work as a psychiatric nurse practitioner, offering integrated care with therapeutic and medication-based modalities. She treats patients 15 and older. In her free time, she enjoys thrillers and being with her family and pets.
Mr. Anderson is a Psychiatric-Mental Health Nurse Practitioner with a background in psychology. He offers supportive psychotherapy in every session and emphasizes collaborative care. He is also experienced in treating opioid use disorder with Suboxone®.
Support Staff
Kerri oversees clinic operations with a focus on delivering compassionate, expert care to every patient. Her leadership ensures the clinic grows to meet community mental healthcare needs. She’s committed to equity and creating a non-judgmental environment for all.
With nearly 16 years of experience in accounts receivable and invoice management, Jackie Johnson is a dedicated professional who ensures accurate and timely billing for all of our patients. Her strong analytical skills and attention to detail allow her to quickly identify and resolve discrepancies, making the billing process smooth and stress-free.
Jackie is passionate about streamlining billing systems and works closely with both patients and colleagues to deliver exceptional service and support. Her commitment to clear communication and patient satisfaction is at the heart of everything she does.
Outside of work, Jackie enjoys spending time with her family, camping, gardening, and caring for her three dogs.
DeeAnn joined Center of Excellence in 2020. She grew up in Seattle and graduated in 2004 as a medical assistant. DeeAnn is passionate about supporting patients in their mental health journey. In her spare time, she enjoys gardening, cooking, and camping with family and friends.
"Saving the world one patient at a time”
A Portland native, Alex began her role as an Administrative and Billing Assistant at the Center of Excellence in January 2025, where she plays a vital role in ensuring the clinic operates smoothly. From greeting patients and managing appointments to verifying insurance and maintaining patient records, Alex is committed to providing exceptional support within the mental health field. She also handles billing, payment collection, and serves as a liaison between patients and providers to ensure effective communication.
Outside of work, Alex is a dedicated mother of two, prioritizing family life while pursuing her passion for healthcare and service. Her personal and professional dedication is driven by her belief in the importance of supporting others.