LaTreece Ross, LPC

Dr. Amanda Kerr is a board-certified Psychiatrist. Her practice focuses on medication management, though she passionately believes in a holistic approach. She attended Boston University for her undergraduate studies and Loyola Marymount University for graduate school. She then completed her training at Midwestern University Arizona College of Osteopathic Medicine for medical school and Rowan University School of Osteopathic Medicine for residency, where she was selected to serve as Chief Resident during her final year. After completion of her residency in 2016, she dedicated seven years to serving a wide range of patients in a community mental health setting, both in-person and via telepsychiatry. She also serves as a provider at an Intensive Outpatient Program. She has experience treating patients with depressive and bipolar disorders, anxiety disorders, PTSD, and OCD. She also has extensive teaching experience in various settings. Dr. Kerr has a gentle and approachable style when providing medication management in conjunction with supportive psychotherapy, and at times Cognitive Behavioral Therapy techniques to more fully address each individual's needs. She utilizes mindfulness approaches as well, which she finds personally meaningful in her practices of meditation and yoga. If Dr. Kerr feels you would benefit from working with a therapist as well, she may recommend and values a collaborative approach.

Tammi Schrager, LCSW, CCBT, is a bilingual (Spanish-fluent) therapist licensed in Texas and Illinois with over 20 years of experience. She earned her MSW from Loyola University Chicago and her BA in Human Services from Kendall College, receiving the Distinguished Student Award. She completed intensive Spanish language study in Mexico and Costa Rica. Her career spans Alzheimer’s care (Distinguished Service Award), Director of Social Services in skilled nursing, discharge coordination at Schwab Rehabilitation Hospital, police liaison and crisis responder, and community mental health serving diverse and underserved populations.

Tammi provides a safe, confidential, HIPAA-compliant space grounded in cultural humility and respect. She works with individuals, couples, and families facing trauma, PTSD, anxiety, depression, ADHD, ASD, mood disorders, and work or collegiate stress. Her style is collaborative, compassionate, and systems-oriented, integrating CBT, EFT, IFS, attachment work, and ABA. She values measurable progress and uses tools such as PHQ-9 and GAD-7 to guide care.

Tammi begins with a comprehensive assessment of personal, cultural, and environmental factors. She develops individualized, evidence-based treatment plans with clear goals and regular progress reviews. Sessions combine cognitive restructuring with skills training and mind-body techniques such as progressive muscle relaxation and paced breathing to reduce anxiety and trauma responses.

Lindsey Wittenhagen, LPC, earned a Master of Science in Clinical Psychology from the University of Texas Permian Basin in 2014 and is a Licensed Professional Counselor. She has extensive experience supporting individuals with anxiety, depression, ADHD, self-worth concerns, relationship challenges, stress management, divorce, and life transitions. Lindsey has worked in outpatient settings and as an advocate for trauma survivors, bringing a compassionate and informed perspective to her practice.

Lindsey’s passion is helping clients navigate the ups and downs of life, whether facing overwhelming stress, relational difficulties, or emotional struggles. Her approach is warm, collaborative, and grounded in the belief that healing happens when individuals feel truly seen and heard. Therapy with Lindsey is not about fixing what is “broken” but about fostering self-understanding, exploring what may be keeping someone stuck, and building tools for well-being. She creates a safe, judgment-free space where clients can show up authentically.

Lindsey begins therapy by gaining a thorough understanding of each client’s history, concerns, and goals during the initial session. She then collaborates with clients to develop individualized treatment plans that reflect their unique needs and aspirations. Progress is continually assessed, with goals and approaches adjusted as necessary to ensure growth, resilience, and meaningful change.

Dr. Mathews is an adult psychiatrist who works with young adults and adults struggling with anxiety and depressive disorders. She uses a compassionate, non-judgmental, and reflective approach to listening and working with clients. Dr. Mathews' practice focuses on medication management, offered in conjunction with supportive therapy in 30-minute follow-up visits. Dr. Mathews completed medical school at Stony Brook University School of Medicine where she also earned her masters in Medical Humanities, Compassionate Care, and Bioethics. She completed her adult psychiatry residency training program at Montefiore/Albert Einstein College of Medicine. The philosophy of Dr. Mathews' practice is to help promote each individual's natural capacity for healing. She ultimately strives to help clients create rich and meaningful lives while also offering mindfulness skills to empower clients to effectively cope with the pain and suffering that life can bring.

Background  and credentials    

Dr. Christa DeFries is a board-certified Adult Psychiatrist. She earned her  medical degree from UT Southwestern Medical School in Dallas, Texas, and  completed her residency in Adult Psychiatry at Baylor Scott & White in  Temple, Texas. Following residency, Dr. DeFries gained additional experience  treating homeless and formerly homeless populations in New York City,  particularly focusing on individuals with histories of trauma and substance  addiction, prior to joining Talkiatry.    

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Treatment approach    

Dr. DeFries practices Adult Psychiatry, employing an integrative treatment  approach combining medication management, psychotherapeutic methods, and  lifestyle modifications. She recognizes that each patient benefits from a  personalized mix of these three aspects of care. Dr. DeFries specializes in  treating diverse psychiatric conditions, including those related to trauma,  substance addictions, and various mental health disorders.    

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What you can expect in a first visit    

In a first visit with Dr. DeFries, patients can expect a comprehensive  evaluation aimed at understanding their individual mental health history,  specific concerns, and overall treatment goals. Dr. DeFries emphasizes an  individualized approach, carefully exploring the best combination of  medication, therapy, and lifestyle adjustments tailored specifically to each  patient's needs. Patients can anticipate an empathetic and collaborative  environment focused on their personal experiences and goals.    

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Why Talkiatry?    

We’re a virtual mental health practice that makes it easy to find great  care. We combine quality and convenience to help you thrive—faster. Our  providers, like this one, are highly trained experts who specialize in  medication management and collaborate with you on a treatment plan that fits  your needs and comfort level.

Haley Cramer is a Licensed Mental Health Counselor (LMHC) in Massachusetts. She earned her MS from Suffolk University and her BS from UMass Amherst, and has additional training in ARC (Attachment, Regulation, and Competency), Motivational Interviewing, Cognitive Behavioral Therapy, and Solution-Focused approaches. Her professional background includes work in community service agencies, public school systems, and drop-in centers, giving her experience supporting individuals from diverse backgrounds, diagnoses, family structures, and life goals.

When working with Haley, openness and honesty around expectations and values are encouraged, as this helps guide meaningful and effective treatment. She offers a flexible, collaborative approach and draws from a wide range of therapeutic modalities. If a particular strategy does not feel helpful, Haley works with patients to understand why and adjust accordingly. She views patients as the experts on their own experiences. Homework and worksheets are available upon request but are never required.

Haley focuses on building trust by developing goals and treatment plans collaboratively with patients. She takes into account lifestyle, aspirations, past experiences with mental health treatment, symptoms, and personal values. Together, she and her patients create achievable goals designed to produce tangible improvements in overall quality of life.