Mark Varela,MD

Background  and credentials    

Dr. Columban Heo is a board-certified psychiatrist. He earned his medical  degree from Touro University Nevada and completed his residency at Unity  Health White County Medical Center. Dr. Heo further specialized by completing  a fellowship in Consultation-Liaison Psychiatry at the Cleveland Clinic,  where he gained extensive experience working within multidisciplinary  healthcare teams, particularly focused on psychiatric care for patients with  complex medical conditions.    

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Treatment approach  

Dr. Heo specializes in treating a broad range of psychiatric conditions,  notably mood and anxiety disorders. He integrates medication management with  a holistic, personalized approach to treatment, emphasizing the  interconnectedness of mind, body, and spirit. Dr. Heo believes in tailoring  treatment plans individually, combining therapy and medications to suit each  patient’s unique needs, and highlights the importance of healthy  relationships in achieving overall mental health.    

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What you can expect in a first visit    

Patients visiting Dr. Heo for the first time can expect a comprehensive and  personalized assessment that explores not just their psychiatric symptoms but  their overall well-being and personal relationships. Dr. Heo prioritizes a  holistic evaluation, carefully balancing medication considerations and  therapeutic interventions tailored specifically to each patient’s situation  and goals. He creates an empathetic, collaborative atmosphere to discuss and  develop personalized plans for mental and emotional wellness.  

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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.

Dr. Sarita Sharma is a board-certified adult psychiatrist dedicated to providing personalized psychiatric treatment that addresses the mind, body, and spirit for optimized health and healing. Born and raised in Toronto, Ontario, she earned her medical degree from Avalon University School of Medicine in Curacao and completed her residency at Southern Illinois University in Springfield, Illinois. Dr. Sharma has extensive experience working with underserved patients from diverse backgrounds and with varying severities of psychiatric disorders. She has a genuine interest in treating mood and anxiety disorders like depression and anxiety. She views medication as one of many tools to aid patients, emphasizing the importance of therapy and lifestyle changes aligned with each patient's goals. Believing in a holistic approach, she incorporates mindfulness techniques, lifestyle optimization (sleep, diet, movement), Dialectical Behavioral Therapy (DBT), Cognitive Behavioral Therapy (CBT), and Acceptance and Commitment Therapy (ACT) to target the root causes of unease. She enjoys helping patients navigate meaning and purpose, relationship dynamics, and self-image. With a sincere, direct, and practical approach, Dr. Sharma values empathy and understanding as vital components of effective care. In her free time, she enjoys spontaneous adventures, connecting with fellow human beings, and just being in nature. She is committed to helping you achieve a balanced, fulfilling life.

Ekta Rathee, DNP, PMHNP-C, is an experienced psychiatric and mental health nurse practitioner with an extensive clinical background in a variety of patient care settings. Rathee's diverse clinical background has strengthened her belief in a holistic approach for optimal patient outcomes. Though her primary focus remains medication management of anxiety, depression, bipolar disorder, OCD, PTSD, ADHD, she equally supports and incorporates the principles of cognitive behavioral therapy, acceptance and commitment therapy, motivational interviewing and enhancement therapy, and supportive therapy in her daily patient care practice. Rathee truly believes in an individualized and holistic patient care approach, which requires a wealth of knowledge, experience, and a commitment to stay abreast of the latest in the field. Her favorite learning modality is to learn from unique patient care scenarios, which often requires a deep dive into the existing body of evidence-based knowledge. Her most important advice for her patients is to never lose hope.

Donna is a Board-Certified Psychiatric Nurse Practitioner dedicated to breaking down mental health stigma and expanding access to compassionate, quality care. With over 20 years of nurse practitioner experience, she has supported patients and families through life’s emotional and physical challenges across outpatient, inpatient, and telepsychiatry settings. Donna is passionate about creating a safe, empowering space where individuals feel seen, heard, and valued on their mental health journey.

Donna helps patients become the best, healthiest version of themselves, both mentally and emotionally. She values open communication, mutual respect, and collaborative decision-making. Her treatment plans include medication management, healthy coping strategies, and tools to build self-awareness and resilience. Known for her warmth and empathy, Donna creates a judgment-free environment where every voice matters.

Donna begins by building trust through a compassionate, in-depth initial interview. Together with each patient, she develops a personalized treatment plan that blends medication management with lifestyle recommendations tailored to individual goals and values. Her holistic approach focuses not just on symptom relief, but on fostering lasting growth, confidence, and overall well-being.

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Dr. Matthew Hamilton is a psychiatrist who works with adults at all stages of life in improving mental health. He emphasizes a holistic approach in collaboration with patients to help them identify and achieve their goals. He has experience helping adults from a diversity of backgrounds with depression, anxiety, bipolar disorder, PTSD, panic, OCD, ADHD, substance use and autism spectrum disorder. He offers one-hour initial consultation appointments, as well as 20 to 30 minutes for follow-up visits. Dr. Hamilton received his undergraduate education at the University of Texas at Austin, his medical degree at Texas Tech University Health and Sciences Center, and completed his residency training at the University of Texas Medical Branch. During training he worked primarily with adults in local clinics and acute care hospitals in the greater Houston area. He was honored with an award for his accomplishments in psychotherapy during his senior year of residency. Dr. Hamilton offers his expertise in both medication management and psychotherapy in his practice, including cognitive, behavioral, motivational, and supportive therapies. He will collaborate with your therapist when you are working with one and may offer a referral to a specialist therapist if indicated.

Dr. Parker Loy holds the position of Staff Psychiatrist at Talkiatry. After finishing undergraduate studies at the University of Tennessee, Knoxville, he completed the University of Tennessee Health Science Center (UTHSC) Master of Science program before enrolling in medical school at the same institution. After graduating from medical school, he completed his residency at UTHSC, during which he trained in a variety of inpatient and outpatient settings and treated a broad spectrum of mental health conditions. He enjoys treating a wide variety of conditions, including mood and anxiety disorders. Therapeutic techniques are incorporated into medication management visits when indicated, and collaboration with therapists may also be recommended.