Sibi Selvarajah, LCSW

Dr. Perington is a Staff Psychiatrist with Talkiatry. She previously served in the US Air Force, where she completed her residency training in psychiatry (Lackland AFB) and was the medical director for a small-sized mental health clinic (Hill AFB). Dr. Perington uses a person-centered approach to tailor treatment to the individual, with an emphasis on shared decision making. She prefers to focus on psychotherapy and behavioral interventions as a primary part of the treatment plan, in addition to any indicated medication.

Motivation for change is a large part of the healing process, and for many people recovery doesn't happen with medication alone. Dr. Perington asks all her patients to play an active role in their treatment.

A thorough diagnostic assessment with discussion of the best treatment setting and modality, then regular follow up visits with emphasis on psychotherapy in addition to medication management (if indicated).

Dr. Kristofer Willers is a board certified adult psychiatrist. He earned his undergraduate degree and Masters in Teaching from Boston University, followed by his medical degree from the

University of Massachusetts Medical School. Dr. Joondeph-Breidbart completed his residency in general adult psychiatry at Cambridge Health Alliance, a Harvard teaching hospital.

Currently, Dr. Kristofer Willers serves as a staff psychiatrist at Harvard University Health Services, where he works with both undergraduate and graduate students. He has developed significant expertise in working with LGBTQ individuals through his involvement with the Gender and Sexuality Clinic at Cambridge Health Alliance and the  LGBTQ Interdisciplinary Team at Harvard University Health Services. While he has extensive expertise in treating college-aged young adults, his practice also includes a broad range of patients, with a particular specialization in Obsessive-Compulsive Disorder (OCD). He is trained in Exposure and Response Prevention Therapy, a highly effective treatment for OCD.

Dr. Kristofer Willers takes a holistic approach to mental health care, integrating therapy into his sessions and collaborating with patients to develop individualized medication regimens that best meet their needs. His gentle and understanding approach helps create a supportive environment for his patients, fostering their mental and emotional well-being.

Dr. Pallavi Tatapudy, MD, earned her medical degree from the Renaissance School of Medicine at Stony Brook University, where she was inducted into the Gold Humanism Honor Society. She completed Stony Brook’s combined residency in Adult Psychiatry and fellowship in Child and Adolescent Psychiatry, along with the Leadership Education in Neurodevelopmental Disabilities Fellowship. Board certified in adult psychiatry and board eligible in child and adolescent psychiatry, she has worked across inpatient, emergency, outpatient, and school settings. Her training includes expertise in Cognitive Behavioral Therapy, Psychodynamic Psychotherapy, and Motivational Interviewing, and she incorporates principles from Supportive Psychotherapy, Dialectical Behavior Therapy, and Family Systems Therapy.

Dr. Tatapudy’s warm, approachable style values each patient’s lived experience. She practices attunement to align with her patients and prioritizes cura personalis—care for the whole person. She is skilled in medication management for a wide age range and integrates therapeutic skill-building. Outside of work, she enjoys nature, visiting national parks, water activities, Indian Bhangra dance, music, and reflecting on meaningful quotes.

Dr. Tatapudy sets a collaborative agenda, listens attentively, and thoroughly reviews patient history. She includes perspectives from support systems when appropriate, offers psychoeducation with creative examples, and encourages open questions and feedback. She shares credible resources, supports learning together, and helps patients define realistic goals and measurable benchmarks for progress.

Dr. Natalie Cummings is a board-certified adult psychiatrist, and board-eligible geriatric psychiatrist. She obtained her medical degree from the University of North Carolina at Chapel Hill, and completed her residency training in psychiatry at the University of Miami Miller School of Medicine and Jackson Memorial Hospital. She then went on to complete her geriatric psychiatry fellowship at Icahn School of Medicine at Mount Sinai Beth Israel. During her fellowship, Dr. Cummings participated in Mount Sinai's Visiting Doctors Program, providing patient-centered and compassionate care to homebound elder adults in New York City. She also received training at Coler Rehabilitation and Nursing Care Center on Roosevelt Island during her fellowship, and presented at the American Association for Geriatric Psychiatry annual meeting. During her training, Dr. Cummings gained extensive experience providing psychiatric care to various patient populations in multiple patient care settings, including in the outpatient clinic, inpatient unit, and emergency department. Following her training, Dr. Cummings worked at New York Presbyterian's Gracie Square Hospital, serving first in the position of float psychiatrist, providing care to patients on every inpatient psychiatric unit (including the young adult/college student program, Orthodox Jewish program, psychotic disorders program, crisis-stabilization program, dual focus program, and Asian Psychiatry program), before transitioning to an established psychiatric attending for the older adult program. During her time at Gracie Square Hospital, Dr. Cummings received the Physician of the Year Award, and served as a Clinical Assistant Professor of Psychiatry at Weill Cornell Medicine. She worked closely alongside staff psychologist, social workers and nurses to provide multidisciplinary, collaborative care to patients suffering from a variety of mental health conditions. Dr. Cummings primarily focuses on medication management and supportive psychotherapy, but has extensive training in utilizing various therapy modalities, including cognitive behavioral therapy, interpersonal therapy, reminiscence therapy, and psychodynamic psychotherapy. When appropriate, Dr. Cummings will refer for more extensive psychotherapy and/or collaborate with your established psychotherapist for comprehensive care. Dr. Cummings strongly believes that addressing psychosocial and interpersonal factors (including relationship health, economic stressors, social isolation and loneliness) is as essential as pharmacologic management in treating mental health conditions. She has particular experience and interest in treating older adults and those suffering from memory disorders, but provides treatment for a variety of psychiatric conditions including depression, anxiety, bipolar disorder, obsessive-compulsive disorders, trauma-related disorders and substance use disorders. Dr. Cummings is a member of the American Psychiatric Association and American Association for Geriatric Psychiatry.

Dr. Troy Grantham is a board-certified staff psychiatrist who treats adult patients. A former engineer, Dr. Grantham has developed a passion for guiding patients along the road to recovery. He completed his undergraduate studies at The University of Texas at Austin and later completed medical school and residency in General Psychiatry at The University of Texas Medical Branch at Galveston. Dr. Grantham's practice focuses on medication management. He utilizes a systematic approach to ensure diagnoses are accurate and treatment plans are optimized to each individual patient. His approach is also holistic in nature, often incorporating therapy and lifestyle modification into the treatment plan. Dr. Grantham employs multiple therapeutic approaches in his practice depending on the needs of the patient including supportive therapy, Cognitive Behavioral Therapy (CBT), and Acceptance and Commitment Therapy (ACT). He places great emphasis on psychoeducation so that patients are aware of the nature and prognosis of their conditions as well as the treatment options available. When multiple treatment options are reasonable, Dr. Grantham takes patient preference into account, offering flexibility to the patient experience. He treats a variety of psychiatric disorders with a particular focus on mood disorders, anxiety disorders, obsessive-compulsive disorders, and trauma-related disorders.

Please note: Dr. Grantham does not prescribe long-term, daily benzodiazepine medications, however he is happy to help you taper off of these medications and transition to a safer, long-term medication regimen.

Dr. Steven Mathew is a trained adult and child and adolescent psychiatrist. He recently completed his child and adolescent psychiatry fellowship at the University of Miami/Jackson Health System, where he served as chief fellow. He completed his general psychiatry residency at Pine Rest Christian Mental Health Services in Grand Rapids, Michigan. Dr. Mathew earned his Doctor of Osteopathic Medicine from the Philadelphia College of Osteopathic Medicine’s Georgia campus, a satellite campus located in the Atlanta metro area. He graduated from the University of Georgia with a Bachelor of Science in Biology and afterwards obtained a Master of Public Health in Health Policy and Management.

Dr. Mathew has had extensive clinical experiences caring for patients across the lifespan in specialty inpatient units, partial hospitalization programs, emergency psychiatry, outpatient clinics, consult liaison psychiatry, and telemedicine. He has clinical expertise in treating depression, anxiety, trauma, OCD, ADHD, and tic disorders.

Dr. Mathew's treatment approach combines evidence-based medication management with supportive therapy, emphasizing empathy, collaboration, and goal-oriented care tailored to each patient and family.

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