Meet our Team
Shawn Witt
Clinical Director
As a trauma survivor herself, Shawn had the vision no person should ever feel alone in their recovery, which prompted her to embark on her therapeutic journey. Obtaining her Master’s in the psychoanalytic discipline from Northwestern University, she became an LPC, and specialized in trauma, personality disorders and addiction. Practicing Level Two EMDR techniques both in her private practice and as the Clinical Director of Perimeter Treatment Center in Sandy Springs, GA, she provides group therapy and long-term treatment options in a personalized setting, for those healing from mental health issues related to trauma and addiction.
Shawn, author of Healing Trauma Through the 12 Steps, often lectures throughout Georgia on trauma and recovery, introducing others to her innovative approach to trauma therapy with a unique connection to community. These experiences motivated her to establish TraumAnon, a peer-led, 12-step trauma support group. Founded in 2019, TraumAnon now has an over 9,000-member community spanning across the U.S. and multiple other countries. Shawn was elected to the LPCA Board of Directors, serving as the Communications Chair, in 2026. She has been a guest speaker at the Georgia Mental Health Consumer Network Conference and hosts certifications and training throughout Georgia. She is a CPS and an FPM (Forensic Peer Mentor).
Addie Weatherford is the Founder and Director of Operations at Perimeter Treatment Center. With extensive experience across behavioral health services, client support, program operations, and treatment coordination, she brings a practical and compassionate understanding of what individuals and families need throughout the care process. Her background allows her to help shape systems that support both high-quality treatment and a positive client experience from the first point of contact through ongoing care.
In her role, Addie oversees day-to-day operations while helping ensure that Perimeter Treatment Center maintains a safe, supportive, organized, and client-centered environment. She works closely with clinical, medical, and administrative teams to strengthen communication, improve coordination, and support consistent standards of care across the organization. Her leadership helps create an environment where staff can collaborate effectively and clients can feel informed, respected, and supported throughout treatment.
Addie is especially focused on making the treatment experience clear, accessible, and personalized for individuals and families seeking mental health or co-occurring care. By supporting strong internal processes, responsive communication, and continuity between different members of the treatment team, she helps ensure that each client receives care that reflects their individual needs and goals. Her commitment to compassionate service, teamwork, and operational excellence continues to play an important role in Perimeter Treatment Center’s mission to provide thoughtful, evidence-based behavioral health support.
Casey Armiger is a Founder of Perimeter Treatment Center and supports the organization’s human resources, operational development, and continued growth. With a background in entrepreneurship and organizational leadership, he brings valuable experience in building strong teams, improving internal systems, and creating a supportive environment for both staff and clients.
At Perimeter Treatment Center, Casey works closely with leadership and administrative teams to strengthen day-to-day operations, support staff development, and help ensure that organizational processes remain aligned with the center’s clinical goals. His work helps create a collaborative environment where clinicians, medical professionals, and support staff can focus on providing individualized mental health and co-occurring care.
Casey is committed to maintaining a workplace culture built on communication, teamwork, professionalism, and compassion. By helping strengthen the people, systems, and resources behind client care, he contributes to the center’s mission of providing reliable, client-centered behavioral health services for individuals and families throughout the Atlanta area.
Comprehensive Mental Health and Co-Occurring Care
Perimeter Treatment Center provides comprehensive mental health and co-occurring care, with individualized outpatient support for anxiety, depression, bipolar disorder, PTSD, mood disorders, emotional dysregulation, substance use concerns, and related conditions. We begin with a compassionate assessment to understand your current concerns, symptoms, and treatment goals. From there, our team develops a personalized plan that may include evidence-based approaches such as CBT, DBT, trauma-informed care, MBSR, medication management, and wellness coaching.
Throughout treatment, we focus on helping you build practical skills, understand patterns, manage emotions, and strengthen long-term wellness. When appropriate, we can also connect you with continued therapy, structured programs such as PHP or IOP, and other supportive resources.
Our Team-Based Approach to Mental Health and Recovery
At Perimeter Treatment Center, our team works together to provide individualized outpatient care for mental health concerns, substance use disorders, and co-occurring conditions. Our approach brings clinical expertise, medical support, therapy, and compassionate guidance together so that each client receives care based on their individual needs rather than a one-size-fits-all program.
Our clinicians and support professionals help individuals address concerns such as anxiety, depression, trauma, mood disorders, emotional dysregulation, substance use, and related challenges. Treatment may include evidence-based approaches such as CBT, DBT, trauma-informed care, mindfulness-based strategies, medication management when appropriate, and ongoing therapeutic support.
By combining professional expertise with clear communication and personalized planning, our team works to create a safe and respectful environment where clients can focus on stability, emotional health, and long-term progress.
What Sets Our Team Apart
1.
Experienced Medical Professionals
Provide medical oversight and collaborate with the clinical team to support safe, individualized treatment when medical care is appropriate.
2.
Registered Nurses (RNs)
Provide compassionate nursing support, symptom monitoring, health education, and coordination with the broader treatment team.
3.
Licensed Therapists
Provide evidence-based counseling and therapeutic support for mental health, trauma, relationship concerns, substance use, and co-occurring needs.
4.
Medical Support Staff
Help create a respectful, organized, and welcoming environment while supporting continuity throughout each client’s care.
Convenient, Confidential, and Personalized Care
We provide a private, accessible outpatient center where each client receives tailored care for their unique needs. From your first phone call to your final appointment, we prioritize comfort, privacy, and clinical excellence.
Our services and areas of support include mental health care for anxiety, depression, bipolar disorder, PTSD, mood disorders, and emotional dysregulation; evidence-based therapies such as CBT, DBT, trauma-informed care, and MBSR; medication management when clinically appropriate; and integrated support for individuals experiencing substance use or co-occurring concerns.
Every treatment plan is based on the individual’s needs, clinical assessment, goals, and appropriate level of care.
Whether it’s your first step toward recovery or part of a continued treatment plan, our compassionate team is committed to helping you achieve lasting wellness.
Call Us
404-383-7826
