Natalie Cummings, MD

Dr. Scott Masters is a Board-Certified psychiatrist and psychoanalyst with over 30 years' experience in medication management and therapy. He is living in Hawaii after a 20-year training and working in New York City.

Columbia University Vagelos College of Physicians and Surgeons

Columbia University Psychiatry Residency Program, Chief Resident

Columbia University Public Psychiatry Fellowship

Columbia University Center for Psychoanalytic Training and Research

Dr. Masters offers an integration of medication management and various psychotherapy. He is certified in supportive psychotherapy, prolonged exposure therapy for PTSD, motivational interviewing, CBT for chronic pain, Integrated Behavioral Couples Therapy and Whole Health.  With the right combination of treatments, patients can achieve their potential and relieve suffering.

In an initial visit, patients can expect a thorough, collaborative discussion with shared decision making to understand their symptoms, life goals, and clinical needs. Dr. Masters will evaluate the patient's condition to determine appropriate medication interventions and discuss personalized treatment recommendations including integrated psychotherapy.  Typical follow-up visits are approximately 20-30 minutes in length. Depending on the severity and complexity of a patient's situation, referrals to additional counseling or therapy may also be suggested.

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Dr. Corey Greenwald is a board-certified psychiatrist with years of experience treating patients in both acute inpatient psychiatric emergencies and outpatient medication and psychotherapy settings. He earned his medical degree from Brown University, completed his internship in the Columbia system, and pursued residency training at Mount Sinai Medical Center in New York City. Dr. Greenwald has practiced in academic, urban, suburban, and rural environments, which has given him broad perspective and adaptability in caring for diverse patient populations.

Dr. Greenwald emphasizes psychoeducation as a core part of care, ensuring patients are active participants in understanding and managing their mental health. He brings a deep interest in transcultural issues and in how social media and news cycles impact emotional well-being. Having witnessed the effects of mental illness within his own family, Dr. Greenwald approaches his work with empathy, insight, and a strong commitment to helping patients feel supported throughout their journey.

Dr. Greenwald works collaboratively with patients to define or clarify concrete treatment goals by the end of the initial appointment. He maintains a low threshold for revisiting and adjusting treatment plans if progress feels unsatisfactory, ensuring care remains flexible and effective. His informal, eclectic interpersonal style allows him to tailor his approach to each individual, fostering trust and partnership in the therapeutic process.

Diana Sun, LMHC, is a licensed mental health counselor with over five years of counseling experience in outpatient settings. She earned her Master’s degree in Mental Health Counseling from Nyack College Alliance Graduate School of Counseling in 2020. Diana has experience working with Asian Americans, Christians, LGBTQ+ individuals, and young adults ages 18 and older. Her clinical interests include inter-generational trauma, women’s issues, stress, anxiety, and depression.

Diana believes communication is essential when setting goals and boundaries within the counseling relationship. She uses fun ice-breaker questions to help patients feel comfortable and to build a strong therapeutic connection. Diana strives to create a safe and supportive environment where patients feel heard, seen, and understood, and she welcomes feedback as an important part of the healing process.

Diana begins by understanding each client’s presenting concerns, personal history, and goals during the initial session. She then collaborates with patients to develop a treatment plan tailored to their individual needs. Her work is grounded in core counseling values such as active listening, self-awareness, and unconditional positive regard to support growth and change.

Dr. Garrick Gaffney is board certified in psychiatry by the American Board of Psychiatry and Neurology (ABPN). He earned his medical degree from Kansas City University and completed his psychiatry residency at John Peter Smith Hospital in Fort Worth, Texas. A combat veteran, he served in the U.S. Marine Corps, including a tour in Iraq, and was honored with the Navy and Marine Corps Achievement Medal and a Certificate of Commendation for exemplary leadership.

During medical school, Dr. Gaffney pursued advanced training as an Osteopathic Manipulative Medicine fellow. As a resident, he served as Chief Academic Resident and earned accolades such as Intern of the Year and Outstanding Educator of the Year twice consecutively.

Dr. Gaffney specializes in treating complex psychiatric conditions, including depression, anxiety, PTSD, OCD, bipolar disorder, and insomnia. He has presented case studies and quality improvement projects at national conferences, including the American Psychiatric Association (APA), Academy of Consultation-Liaison Psychiatry, and Association for Academic Psychiatry.

A proponent of holistic care, Dr. Gaffney integrates psychotherapy into medication management and emphasizes lifestyle modifications and evidence‑based integrative medicine.

New patients receive comprehensive evaluations to rule out medical causes of symptoms, followed by tailored treatment plans combining therapy, medication, and lifestyle adjustments. Follow‑up visits focus on symptom management through supportive, brief dynamic, or cognitive behavioral therapy, with frequent appointments until stabilization is achieved.

Dr. Gaffney is committed to collaborative, patient‑centered care that addresses both mental and physical well‑being.

Dr. Colleen Ryan is a psychiatrist who grew up in Kentucky and has trained and practiced in a wide range of clinical settings. Her experience spans inpatient and outpatient care, community mental health, state hospitals, addiction clinics, VA hospitals, and academic medicine. She became board certified in addiction medicine in 2019, deepening her understanding of how addiction affects individuals and families. She has also worked extensively with patients experiencing Post-Traumatic Stress Disorder, including both military- and civilian-related trauma. Her diverse background allows her to appreciate the complex personal, social, and medical factors that influence mental health.

Dr. Ryan believes effective treatment begins with understanding a patient’s life experiences and perspective. She takes time to explore how patients see their challenges and what is or is not working for them. While medication can be an important tool, she does not focus on medication alone and values open discussion about its benefits and concerns. She prioritizes understanding how patients are functioning across all areas of life and strongly values a collaborative approach, viewing treatment as a partnership built on shared decision-making.

Dr. Ryan begins with a thorough evaluation that includes medical and family history, ensuring that underlying medical issues are not overlooked. The first visit is also an opportunity to build rapport and help patients feel comfortable. Together, she and her patients develop a treatment plan aligned with the patient’s goals. She recognizes that goals evolve over time and works collaboratively to adjust treatment as part of the ongoing growth process.

Dr. Jennifer Shoenfelt is a staff psychiatrist at Talkiatry. She is double board certified in child and adolescent psychiatry and adult psychiatry. She has been practicing for over 14 years. Dr. Shoenfelt's practice focuses on child and adolescent medication management. Typically, she offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. However, occasionally Dr. Shoenfelt may believe that additional therapy is needed and will ask that you bring a therapist into your care team to provide the best outcome. She provides treatment plans that include holistic recommendations for diet, exercise, and educational and psychosocial/spiritual aspects of care. She is known for listening to and respecting patients' stories and walking them on a path of recovery and growth. Dr. Shoenfelt received her medical degree from the Boonshoft School of Medicine at Wright State University in Dayton, Ohio. She earned her Bachelor of Science degree in Physical Therapy from The Ohio State University. Dr. Shoenfelt practiced for 14 years in physical therapy with a specialization in children with developmental and neurological disabilities before attending medical school. Dr. Shoenfelt has held multiple positions in hospital and outpatient psychiatry, including community mental health, developmental and foster care settings, and medical director positions. She has served as clinical faculty for both the Wright State Department of Psychiatry and the University of Cincinnati School of Medicine. She has a passion for the education of medical students, residents, and patients. Dr. Jennifer Shoenfelt is a staff psychiatrist at Talkiatry. She is double board certified in child and adolescent psychiatry and adult psychiatry. She has been practicing for over 14 years.