Marc Whaley, MD

Dr. Susan Kim is a board certified psychiatrist who was born and raised in Queens, NY. She has spent much of her time in the North East and is currently residing in New Jersey with her spouse and dog, Luna. Dr. Kim began her medical training at Temple University in Philadelphia and completed her psychiatric residency at Stony Brook University Hospital, where she was chief resident for her final year. She has worked in numerous psychiatric roles. This includes working at a Comprehensive Psychiatric Emergency Program (CPEP) at Stony Brook University Hospital, as well as the inpatient voluntary psychiatric unit at Holy Name Hospital. She has also worked as a psychiatric consultant for patients admitted to medical-surgical units at Holy Name Hospital. Dr. Kim is well versed in medication management, particularly for depression, anxiety, as well as psychotic disorders. Her treatment style includes several psychotherapeutic techniques, including supportive, cognitive behavioral, and psychodynamic, based on her patient's needs and preferences. She also holds a special interest in cultural psychiatry as well as relational intelligence.

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.

Serena Mirchandani is a board-certified psychiatric nurse practitioner with extensive experience treating serious mental illnesses such as bipolar disorder and schizophrenia spectrum disorders. She also provides care for individuals with depression, anxiety, PTSD, OCD, autism spectrum disorder, and substance use disorders. Serena earned both a Master of Science in Nursing and a Doctorate in Nursing Practice in psychiatry from Columbia University. She completed a Nurse Practitioner Fellowship at Community Healthcare Network and worked at Bellevue Hospital for 2.5 years, providing care on an inpatient psychiatric unit for a diverse, underserved population.

Serena’s approach is grounded in open communication, evidence-based care, and deep respect for each patient’s lived experience. She prioritizes a collaborative, safe space where individuals feel heard, respected, and empowered. Her holistic style supports honest conversation, transparency in treatment options, and patient-centered goals.

Serena begins with a comprehensive assessment to understand each patient's full story—biological, psychological, and social. She then partners with patients to develop personalized, evidence-based treatment plans that align with their values and goals. She emphasizes education, transparency, and regular follow-up to support ongoing progress and informed decision-making.

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Sundahl understands the importance of collaboration and the therapeutic alliance when working with patients. He will clearly explain his findings and discuss treatment options he feels are reasonable. Dr. Sundahl thinks it is important for patients to have all the necessary information to make informed decisions when it comes to their psychiatric treatment.

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Dr. Sahadevan took an adventurous path to Talkiatry. After perhaps thinking a little too hard about Intro to Philosophy in college - "the unexamined life is not worth living” - he first used his chemistry degree to work in pharmaceutical research. He changed course, working in computer network engineering, before deciding to find a more meaningful path. He worked as an EMT, then earned a Master's in Physiology before finally landing in medical school at Ohio State. Finding a surprising interest in psychiatry, he stayed at Ohio State for residency, and then a fellowship in forensic psychiatry. He is board-certified in both Psychiatry and Forensic Psychiatry. He previously worked as a forensic psychiatrist and evaluator at Ohio's maximum-security state psychiatric facility, as an attending psychiatrist running an inpatient unit for violent or dangerous patients, performing court-ordered evaluations, writing reports, and testifying when necessary. Dr. Sahadevan has also worked as a consultation-liaison psychiatrist, performing psychiatric consults at several general hospitals in Central Ohio's largest hospital system. He found great enjoyment in teaching successive generations of residents and medical students, serving as an adjunct faculty member at Ohio State, Ohio University, Wright State, and OhioHealth Riverside Methodist Hospital. He is excited for the next chapter of his journey, exploring another area of psychiatry at Talkiatry!

Dr. Romanow is double board-certified in Adult Psychiatry and Forensic Psychiatry. He graduated summa cum laude from the University of Pittsburgh with a Bachelor of Science degree in Sports Medicine/Athletic Training and then attended Drexel University College of Medicine. After medical school, he completed his residency in Adult Psychiatry at the University of Virginia, where he obtained a certificate in additional psychotherapy training. After residency, Dr. Romanow completed a fellowship in Forensic Psychiatry at the University of Virginia. During his fellowship, he trained at the prestigious Institute of Law, Psychiatry, and Public Policy (ILPPP) and Western State Psychiatric Hospital where he performed criminal and civil forensic evaluations. He also provided clinical care at a maximum security prison. Prior to joining Talkiatry, Dr. Romanow worked at a healthcare system in Montana providing inpatient and outpatient psychiatric care involving medication management and psychotherapy. Additionally, he operates a private forensic psychiatry practice that conducts mental health evaluations for the legal system. Dr. Romanow has extensive experience treating various mental health disorders including depression, bipolar disorder, anxiety and obsessive-compulsive disorders, post-traumatic stress disorder, and ADHD. His clinical work includes assisting patients who experience mental health disorders with co-occurring substance use problems. He has training in various schools of psychotherapy including cognitive behavioral therapy (CBT), CBT for insomnia, motivational interviewing and supportive psychotherapy. Dr. Romanow incorporates treatment focusing on the importance of exercise, diet, and good sleep habits as a part of comprehensive mental health care.‍