Kishan Peddanna, MD

Background and credentials

Dr. Stefan is a psychiatrist with extensive experience in outpatient care, inpatient care, and assertive community treatment. She has served as a medical director for large institutions, overseeing the treatment of individuals with complex mental illnesses. Born and raised in Puerto Rico, she is fluent in both English and Spanish. She earned her medical degree from the University of Puerto Rico School of Medicine and completed her psychiatry residency at the University of Florida, where she received recognition for her skills as a psychotherapist.

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Treatment approach

Dr. Stefan is deeply committed to patient-centered care, adapting her role to the individual needs of each patient. She believes in treating the whole person, rather than just a diagnosis, recognizing that each patient has unique psychosocial circumstances. She has a strong foundation in psychotherapeutic interventions and is dedicated to providing engaging, compassionate, and meaningful therapy in every patient interaction. With over 10 years of experience as a psychiatrist, she has worked extensively in telemedicine since 2013, ensuring that remote care is as effective and personal as in-person visits.

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What you can expect in a first visit

Patients meeting Dr. Stefan for the first time can expect a comprehensive and holistic evaluation that considers their symptoms, personal history, and life circumstances. She takes the time to build strong therapeutic relationships, fostering a caring and engaging environment where patients feel understood and supported. Whether through telemedicine or in-person care, she prioritizes personalized treatment plans that integrate medication management and psychotherapy, ensuring the highest quality of care tailored to each patient’s needs.

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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.

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Shelah Radke, MD, JD, is a double board-certified Child and Adolescent and Adult Psychiatrist with over a decade of extensive experience in mental health care, specializing in the well-being of children, adolescents, and young adults. She currently serves in St. Louis, MO, where she is known for her dynamic leadership as a Medical Director and her robust clinical practice. Throughout her career, Dr. Radke has held pivotal roles, including Medical Director of Crisis Psychiatry Services at Mercy Hospital and key positions in several reputable outpatient clinics across the U.S. Her clinical acumen spans a diverse range of settings, from private practice and crisis care to specialized programs in residential and educational institutions.

A staunch advocate for evidence-based approaches, Dr. Radke integrates lifestyle and pharmacological interventions to foster mental health resilience among her patients. She is particularly passionate about the shared decision-making model, which enhances patient empowerment and satisfaction by actively involving them in their treatment plans. Dr. Radke's academic contributions are equally notable. She has developed educational curriculums that significantly improve health outcomes and has shared her expertise through numerous media appearances and professional talks. Her commitment to medical education is reflected in her mentorship of nurse practitioners and her involvement in creating community psychiatry programs.

Complementing her medical expertise, Dr. Radke holds a Juris Doctorate, with a focus on public health and social policy, which enriches her understanding of the legal and systemic aspects of healthcare. Her approach is deeply holistic, informed by her training in integrative medicine and her personal commitment to wellness, which she practices through nutrition, exercise, and travel with her family. Dr. Radke's professional journey is driven by a commitment to optimizing mental health outcomes and enhancing the quality of life for her patients and their families.

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Dr. Lindsay Legnon is board-certified in Psychiatry and has 15 years of experience in outpatient clinical psychiatry. Her focus is primarily on medication management, but she does incorporate brief cognitive behavioral therapy and supportive therapy when appropriate. If more extensive psychotherapy is felt to be beneficial, she will recommend a therapist and collaborate with them for optimal care. She completed her medical degree at Louisiana State University in Shreveport and her residency at Tulane University in New Orleans, where she served as Chief Resident. After completing her residency, she worked primarily in outpatient clinics treating a wide range of mental health disorders. She has extensive experience treating major depressive disorder, a variety of anxiety disorders, OCD, PTSD, and bipolar disorder, among others. Medication is felt to be an important tool for many in achieving wellness, and she encourages a holistic approach to improve outcomes. Her hope is to provide relief and help people achieve their goals in their journey back to wellness.

Dr. Chuck Stanfa is a board-certified psychiatrist who genuinely enjoys helping people.  He has practiced in a wide range of settings, including both outpatient and inpatient during the past 10 years.  He studied medicine at the University of Medicine and Dentistry of New Jersey.  He completed his psychiatry residency training at Drexel University College of Medicine in Philadelphia.  He went on to complete a Community Psychiatry Fellowship at the University of Pennsylvania and has continued to serve the greater Philadelphia area.  

Dr. Stanfa tries to take a person-centered approach to psychiatry.  He spends time getting to know each person and is easy to talk to.  He takes a collaborative approach to medication management and provides supportive therapy.  He believes that the relationship is one of the most important aspects of treatment.  He is open to working with most diagnoses including Mood Disorders, Anxiety Disorders, PTSD, ADHD, Personality Disorders, and others.  He will work with each person to develop a treatment plan that works for them.

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Dr. Sophia Monsour holds the position of Chief Psychiatrist for Pennsylvania at Talkiatry. After completing residency in 2013 at Albany Medical Center, she has spent the past 9 years fulfilling her passion for integrated and specialty care for adults suffering from mental illness. Her years of experience have included working as an integrated care Psychiatrist at a community health center, a medical director of a Partial Hospital and Intensive Outpatient Program (PHP/IOP), and also working for an Assertive Community Treatment Team (ACT) specializing in the Serious Mentally Ill (SMI) population. Most recently, she has been serving our veterans as the Outpatient Section Chief, Primary/Mental Health Integration Medical Director and Resident/Medical Student Coordinator at VA Pittsburgh. Dr. Monsour has an approachable style when treating individuals who suffer from various diagnoses, especially those with prior trauma. She provides supportive psychotherapy and at times uses psychodynamic therapy skills to address her patient's current stressors and to identify the root cause of their ailment. She believes in a holistic approach and utilizes mindfulness as a technique along with medication management.

Dr. Caleb Cheatham is a board-certified psychiatrist who completed his undergraduate studies at Stetson University in DeLand, FL, before earning his medical degree and completing his psychiatry residency at the University of Tennessee Health Science Center in Memphis, TN. He brings a strong foundation in psychopharmacology and a deep commitment to person-centered care.

Dr. Cheatham takes an open, nonjudgmental approach and strives to create a safe space for patients to share vulnerably. He believes in leading with compassion and listening as a core tool for understanding. His treatment philosophy is integrative—combining thoughtful medication management with supportive, individualized therapy—and he encourages patients to consider the role of lifestyle factors like sleep, nutrition, and exercise.

Dr. Cheatham begins with a conversational consultation focused on understanding each patient’s story and needs. Together, they co-create a personalized treatment plan grounded in the patient’s values. He emphasizes clear communication and routinely revisits treatment goals to ensure alignment, progress, and ongoing support.