Ashley Harmon, MD

Kristina Bona is a Licensed Professional Counselor with extensive experience working in the mental health field. Kristina received her bachelor's from The University of Texas at Austin and proceeded to obtain her Master's degree in Counseling from The University of Texas at San Antonio. Since graduating with her Master's, she has worked in the mental health field, providing mental health relief to a wide demographic of clients. Over the past 10 years, Kristina has worked for various agencies, ranging from the local mental health authority to private practice. Kristina has experience working with people experiencing Anxiety, Depression, Mood disorders, and other mental health diagnoses interfering with daily living. As a clinician, she meets the client where they are in their life and tailors her treatment style to help them learn/apply strategies in developing skills for emotional regulation, developing healthy boundaries, effective communication skills, and more. Kristina uses an eclectic blend of cognitive behavioral therapy, dialectical behavioral therapy, solution-focused therapy, and mindfulness to increase the clients' resiliency and autonomy and empower them to live full lives.

Nathan Roberson is a Licensed Clinical Mental Health Counselor in North Carolina and a Licensed Professional Counselor in South Carolina and Texas. Nathan has a Masters in Counseling from Southern Methodist University. He has worked in primarily in outpatient settings that focused on mental health and substance use.

Nathan enjoys helping adults identify what is holding them back from creating the life that they want and working together to overcome the feelings, limiting beliefs, traumas, etc, that stand in the way of that goal.  

When working with clients, the approach Nathan will use varies with what is needed to help address the issues at hand. During the sessions, Nathan will draw upon CBT, Solution-Focused, psychodynamic, and reality theory, among others. Nathan believes having the flexibility to use the best tool for the job helps because every client is different and will respond differently to a specific approach.

Diana Veliz, LCSW, obtained her MSW from Fordham University. Diana has over 3 years of experience providing client-centered therapy. Her practice is sensitive to race and culture, and trauma-informed. Diana has experience working with adults, and adolescents experiencing anxiety, depression, and other mental health disorders. She has worked in outpatient/inpatient clinics and in an educational setting supporting children with social emotional learning. Diana believes that the best approach is to work collaboratively with the client while also considering that each person's experience is individual to them. The client is an expert in their lives, and as a clinician, she is there to meet the client where they are at and begin the healing journey through non-judgment and compassion. Diana uses cognitive behavioral therapy, solution focused approach, and psycho-education. She also considers the client's place in society and how culture and race can contribute to challenges. Diana takes passion in working with clients to improve self-esteem, recognize schemas, regulate emotions, and develop self-awareness.

Meredith McMillan is a Licensed Mental Health Therapist with 9 years of experience working in mental health. She specializes in working with individuals who experienced trauma and toxic stress, as well as those with addiction issues, relationship challenges, and adjustment disorders. Ms. McMillan's therapy practice focuses on providing person-centered encouragement and support. She utilizes a trauma-focused cognitive behavioral approach to help you to develop your understanding of yourself and your challenges and enable you to utilize your strengths to facilitate your healing. She received a Master's Degree in Counseling Psychology from Palm Beach Atlantic University in Orlando, Florida, and established herself as a therapist working in community mental health in the Lakeland, Florida area. She spent several years working at Tri-County Human Services providing co-occurring outpatient substance abuse therapy. Later, she shifted to providing services to children through Tri-County's B-Net program and Children's Home Society. She went on to become the Clinical Supervisor at the Children's Home Society providing care to children and adolescents impacted by trauma and the child welfare system. Before joining Talkiatry, she also served as the clinical supervisor and therapist at The Mary Welsh Foundation, providing care to individuals of all ages and specializing in trauma and family issues. Ms. McMillan has worked with individuals dealing with a variety of mental health issues throughout her years of experience as a therapist. She has worked with people of all ages and has experience working with families and couples. She has had additional training to serve individuals dealing with addictions and with processing trauma. She has had extensive experience working with individuals dealing with mood disorders and anxiety, as well as relationship and parenting issues.

Dr. Luna Sanchez Rivera holds the position of Staff Psychiatrist at Talkiatry. After completing residency in 2016 at the Ponce Medical School Psychiatry Residency in Puerto Rico, she then moved to North Carolina to complete a subspecialty in Child and Adolescent Psychiatry at Duke University Health System. There, she transitioned into an assistant professor position, focused on structuring pediatric emergency psychiatric services, and helped support the consult and liaison pediatric service. Her years of experience have included working as an integrated care child psychiatrist within outpatient clinics at Duke University Health System, and she trained and worked as a staff psychiatrist at the Inpatient State Facility in North Carolina. She also served in the Dayton Children's Hospital outpatient clinics in Dayton, Ohio, the Appalachian Health System outpatient clinics in Linville, North Carolina, and more recently has been serving the Child and Adolescent inpatient population in Bangor, Maine. Dr. Sanchez Rivera has an approachable style aimed at providing a comprehensive evaluation for all age ranges and is comfortable managing various levels of diagnostic complexities. She provides supportive psychotherapy while using psychodynamic therapy skills to clarify her patient's constellation of symptoms, identify unifying themes and provide thorough psychoeducation throughout the process to drive positive outcomes. She integrates psychodynamic medication management approaches and is adept at family therapy interventions.

Margaret Ngumi, MSN, APRN, FNP-C, PMHNP-BC, is a dual board-certified Psychiatric Mental Health and Family Nurse Practitioner with over 20 years of experience in healthcare. She began her career as a Family Nurse Practitioner before recognizing the urgent need for accessible mental health services. This led her to pursue a post-master’s certification in psychiatry, allowing her to provide comprehensive psychiatric care. Margaret has extensive experience treating patients in both inpatient and outpatient settings, addressing conditions such as depression, anxiety, PTSD, mood disorders, and substance use disorders.

Margaret believes in a collaborative, patient-centered approach to mental health care. She strives to create a safe and supportive space where patients feel heard and empowered to take an active role in their treatment. With a strong emphasis on holistic care, she considers all aspects of a patient’s well-being, including lifestyle, relationships, and overall health. Whether through medication management, therapy, or lifestyle modifications, she is committed to helping patients achieve meaningful and lasting improvements in their mental health.

Margaret begins with a comprehensive psychiatric evaluation to understand each patient’s history, concerns, and treatment goals. She then works closely with them to develop an individualized care plan that may include medication management, therapy, and evidence-based lifestyle interventions. She prioritizes open communication, patient education, and ongoing collaboration to ensure that treatment remains effective and evolves with each patient's needs. Through her compassionate and evidence-based approach, Margaret is dedicated to helping patients find balance and improve their overall quality of life.