About Our Practice

Compassionate, person-centered mental health care that honors your unique journey and empowers lasting wellness.

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Our Mission & Values

At Tide & Branch Psychiatry, we believe in the power of compassionate, individualized care to transform lives and foster lasting wellness.

Our Mission

To provide compassionate, comprehensive mental health care that honors each person's unique journey, empowering individuals to achieve lasting wellness through evidence-based treatment and genuine therapeutic relationships.

Our Values

  • Compassion: We approach every interaction with empathy and understanding
  • Respect: We honor each person's dignity, autonomy, and unique perspective
  • Excellence: We provide evidence-based, high-quality care tailored to individual needs
  • Collaboration: We work as partners with our patients in their healing journey
  • Hope: We believe in every person's capacity for growth and recovery

Our Treatment Philosophy

We believe that effective mental health care goes beyond symptoms to address the whole person.

At Tide & Branch Psychiatry, we understand that mental health is deeply personal and uniquely individual. Our approach is rooted in the belief that healing happens within the context of genuine, therapeutic relationships built on trust, respect, and understanding.

Person-Centered Care

We see you as a whole person, not just a diagnosis. Your experiences, values, goals, and preferences guide every aspect of your treatment plan.

Integrated Approach

We consider the connection between mind, body, and life circumstances, addressing not just symptoms but the underlying factors that contribute to your well-being.

Collaborative Partnership

You are the expert on your own experience. We work together as partners, combining our clinical expertise with your insights to create the most effective treatment plan.

Evidence-Based Treatment

Our treatments are grounded in the latest research and best practices, ensuring you receive care that is both effective and safe.

"Mental health is, unfortunately, an underserved portion of the medical field… until you find Tide&Branch Psychiatry. From the moment you walk in the door with the aesthetics and calming music/imagery; to the compassion, attention to detail and follow through that Chloe excels in; to the expertise, empathy, and ultimate desire to help that Dr. Marnell exudes - you are in the utmost of high quality care."

— A thankful patient

Meet Our Team

Our experienced providers are dedicated to providing exceptional, compassionate mental health care.

Head shot image of provider Calysta Tilley.

Calysta Tilley

PA-C, CAQ-Psych

Board-certified Psychiatric Physician Assistant with a CAQ in Psychiatry. Specializing in ADHD, mood and anxiety disorders, as well as perinatal and postpartum mental health. Dedicated to empowering patients through compassionate, personalized care.

Education & Credentials:

  • Master of Science in Physician Assistant Studies Board Certified Physician Assistant (PA-C) Certificate of Added Qualifications in Psychiatry (CAQ-Psych) Licensed in Georgia
Meet Calysta Tilley
Head shot image of provider Paige Marnell.

Paige Marnell

MD, FAPA, FASAM

Board-certified Psychiatrist specializing in adult psychiatry, substance use, mood, and anxiety disorders. Dedicated to providing comprehensive, evidence-based care that supports long-term recovery and mental wellness

Education & Credentials:

  • Doctor of Medicine (MD) Psychiatry Residency Training Board Certified in Psychiatry Addiction Medicine Fellowship Training Board Certified in Addiction Medicine Licensed in Georgia
Meet Paige Marnell
Head shot image of provider Ashley Lewis.

Ashley Lewis

MSN, CPNP, PMHNP-BC, PMH-C

Dually certified Pediatric Nurse Practitioner and Psychiatric Mental Health Nurse Practitioner with specialized certification in perinatal mental health. Specializing in perinatal and postpartum mental health, child development, behavioral pediatrics, and psychiatric care for children and families. Dedicated to providing compassionate, evidence-based care for mothers and young children.

Education & Credentials:

  • Master of Science in Nursing Certified Pediatric Nurse Practitioner Psychiatric-Mental Health Nurse Practitioner-Board Certified Psychiatric-Mental Health Certified
Meet Ashley Lewis

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Stories of Hope & Healing

While maintaining complete confidentiality, we're honored to share the impact of compassionate mental health care.

"After struggling with anxiety for years, I finally found a place where I felt truly heard and understood. The team took time to really listen to my concerns and worked with me to find the right treatment approach. I'm now managing my anxiety better than I ever thought possible."

— A grateful patient

Treatment Focus:

Anxiety disorders, medication management, and coping strategies

"The postpartum period was incredibly challenging for me, but Dr. Marnell provided exactly the support I needed. She understood the unique challenges of new motherhood and helped me navigate both medication safety while breastfeeding and emotional support. I feel like myself again."

— A new mother

Treatment Focus:

Postpartum depression, maternal mental health, and family support

"I was hesitant to seek help for my substance use, but the team made me feel welcomed and supported from day one. They treated me with dignity and respect, and their comprehensive approach helped me not just with addiction but with the underlying depression I'd been struggling with for years."

— A person in recovery

Treatment Focus:

Substance use disorder, co-occurring depression, and integrated care

*All patient stories are shared with permission and identifying details have been changed to protect confidentiality. Individual results may vary.

Ready to Begin Your Journey?

Take the first step toward better mental health. Our compassionate team is here to support you every step of the way.

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Questions? We're here to help:
(912) 216-2499