Rajesh Gaddam, MD

Dr. Osman Athar is board certified in General Psychiatry and board eligible in Consult-Liaison Psychiatry. He graduated with a Bachelor of Arts in English from Rice University and McGovern Medical School for his medical doctorate, and went on to complete a psychiatry residency at the University of Texas-Houston, where he served as a chief resident. Afterward, he completed a fellowship in Consult-Liaison Psychiatry at Louisiana State University - Ochsner Medical Center in New Orleans. Dr. Athar has experience in treating a wide variety of conditions, including Major Depression, OCD, Bipolar Disorder, ADHD, Eating Disorders, Anxiety Disorders, PTSD, Substance Use Disorders, Delirium, Dementia, and Mental Disorders due to Another Medical Condition. Dr. Athar primarily focuses on medication management in his practice but will typically also use supportive therapy and cognitive behavioral therapy skills with his patients in order to maximize wellness and recovery. Dr. Athar held an academic appointment at the University of Mississippi Medical Center where he was an assistant professor of psychiatry. He served as the clerkship director for the Medical Neuroscience and Behavior Course during his appointment, which required a six-week course for third-year medical students, which included four weeks of psychiatry education. During his appointment, Dr. Athar was also very active in resident education, focusing on topics related to consult-liaison psychiatry. Dr. Athar has experience in treating a wide variety of conditions, including Major Depression, OCD, Bipolar Disorder, ADHD, Eating Disorders, Anxiety Disorders, PTSD, Substance Use Disorders, Delirium, Dementia, and Mental Disorders due to Another Medical Condition. Dr. Athar primarily focuses on medication management in his practice.

Margaret Ngumi, MSN, APRN, FNP-C, PMHNP-BC, is a dual board-certified Psychiatric Mental Health and Family Nurse Practitioner with over 20 years of experience in healthcare. She began her career as a Family Nurse Practitioner before recognizing the urgent need for accessible mental health services. This led her to pursue a post-master’s certification in psychiatry, allowing her to provide comprehensive psychiatric care. Margaret has extensive experience treating patients in both inpatient and outpatient settings, addressing conditions such as depression, anxiety, PTSD, mood disorders, and substance use disorders.

Margaret believes in a collaborative, patient-centered approach to mental health care. She strives to create a safe and supportive space where patients feel heard and empowered to take an active role in their treatment. With a strong emphasis on holistic care, she considers all aspects of a patient’s well-being, including lifestyle, relationships, and overall health. Whether through medication management, therapy, or lifestyle modifications, she is committed to helping patients achieve meaningful and lasting improvements in their mental health.

Margaret begins with a comprehensive psychiatric evaluation to understand each patient’s history, concerns, and treatment goals. She then works closely with them to develop an individualized care plan that may include medication management, therapy, and evidence-based lifestyle interventions. She prioritizes open communication, patient education, and ongoing collaboration to ensure that treatment remains effective and evolves with each patient's needs. Through her compassionate and evidence-based approach, Margaret is dedicated to helping patients find balance and improve their overall quality of life.

Dr. Laura Rosas is an adult psychiatrist at Talkiatry who practices compassionate, patient-centered care. As a multiracial psychiatrist, she serves diverse communities and focuses on treatment plans that respect each patient's background. She treats various diagnoses, including trauma, mood, personality, and eating disorders, with a particular interest in the student and LGBTQ+ communities. Using a range of skills and interventions from psychodynamic therapy, cognitive behavioral therapy (CBT), dialectical behavior therapy (DBT), acceptance and commitment therapy (ACT), and mentalization-based therapy (MBT), Dr. Rosas prioritizes a collaborative approach. She ensures patients are actively involved in shaping their treatment, including decisions about medication and supplements. This cooperation allows for personalized care plans that align with each patient's needs, values, and goals. Recognizing that cultural influences, substance use, financial constraints, and other societal factors impact mental health, Dr. Rosas examines these personal aspects to provide effective, holistic care in a non-judgmental space. She graduated from McGovern Medical School (UT Houston) and completed her residency in psychiatry at the University of Chicago. She aims to make healthcare more accessible and affordable, driving systemic changes in mental health care.

Dr. Richard McCall is a board-certified psychiatrist with over 25 years of comprehensive experience in delivering exceptional mental health services across various settings. He received his medical degree from the University of Virginia School of Medicine and completed his Psychiatry residency training at Duke University School of Medicine. He treats adult patients of all ages and is known for a compassionate, patient-centered approach. Dr. McColl integrates psychopharmacology with multiple psychotherapy modalities. He has specialized training in psychodynamic psychotherapy, Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), Acceptance and Commitment Therapy (ACT) and more. He looks forward to helping patients reach their goals for mental health care while providing a compassionate and collaborative environment.

Dr. TreSina E. Steger (Dr. Tre) is a licensed professional counselor (LPC) who has practiced as a mental health therapist for several years. She received a Bachelor of Science degree from Mount Olive College, in NC, a Master of Science in Psychology and Clinical Mental Health Counseling from Capella University, in MN, and a Doctorate in Education, in Higher Educational Leadership from Liberty University in VA. She has worked in business, outpatient mental health, non-profits, in private practice, and with the military. She is a National Certified Counselor (NCC), a Board Certified Tele-Mental Health Provider (BC-TMH), Certified Dialectical Behavioral Therapist (CDBT), and Certified Trauma Focused Cognitive Behavioral Therapy (C-TFCBT). Dr. Tre uses person-centered, solution-focused, DBT, CPT, CBT, motivational interviewing, mindfulness, psychodynamic, and other approaches to assist clients. She strides in aiding clients work on attachment issues, relationship problems, ADHD, self-esteem, self-worth, gender identity, boundary issues, trauma, depression, and anxiety. Dr. Tre has worked with clients from a variety of backgrounds, populations, and identities and takes pride in being a LGBTQIA+ affirming, a gender-affirming, BIOPC therapist who has worked with clients who have experienced various types of traumas. Clients will find she has a conversational tone, direct, non-judgmental approach when addressing their therapeutic goals and provides a safe space for them to do their work.

Background and credentials

Dr. Diane Lewis is board-certified in general psychiatry by the American Board of Psychiatry and Neurology. She earned both her undergraduate and medical degrees at Texas A&M University (College Station and Temple, TX) before completing her general psychiatry residency at UT Southwestern - Austin Programs (now Dell Medical School residency programs). After her residency, she practiced for eight years as a staff psychiatrist at the University of Texas' student counseling center. She also has experience working in hospital admissions and emergency department settings.

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Treatment approach

Dr. Lewis employs a medication-management-focused approach typically paired with supportive therapy during 30-minute follow-up visits. She strongly values a collaborative treatment approach, frequently encouraging patients to incorporate additional therapy for the best outcomes. Her primary specialty is college mental health, treating patients aged 18-45 with a range of mental health conditions from mild to complex. Dr. Lewis emphasizes authenticity, compassion, and recognizing patients beyond their diagnoses, providing care tailored to individual circumstances and goals.

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What you can expect in a first visit

During a first visit, patients can expect Dr. Lewis to conduct a thorough evaluation, carefully listening to their concerns, and considering their symptoms within the broader context of their lives. Her patients appreciate her down-to-earth and compassionate communication style. She aims to create an environment where patients feel understood, respected, and actively involved in shaping their personalized treatment plan, often recommending additional therapy support when beneficial for achieving optimal outcomes.

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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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