John Whittier, MD

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.

Elyse Sipka is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) with over a decade of experience as a mental health RN in outpatient, inpatient, and residential settings, including eating disorder treatment centers, inpatient psychiatric units, and crisis units. She earned her Master of Science in Nursing from Indiana Wesleyan University in 2021 and has been practicing as a PMHNP in an outpatient setting for over four years, caring for adults with a wide range of mental health needs including depression, anxiety, OCD, bipolar disorder, ADHD, PTSD, substance use, eating disorders, and severe mental illness.

Elyse creates a safe and supportive environment where patients feel heard and valued. She is warm, empathetic, and approachable, providing comprehensive and holistic care that combines medication management, therapy, and lifestyle interventions to help clients achieve their treatment goals.

Elyse begins with an in-depth initial assessment exploring physical, mental, emotional, and spiritual health. She collaborates with clients to develop individualized treatment plans, integrating medication management with psychotherapy using principles of supportive therapy, Acceptance and Commitment Therapy (ACT), and Cognitive Behavioral Therapy (CBT).

Dr. Triston Wong is a board-certified adult psychiatrist who emphasizes a collaborative approach and strong therapeutic alliance in the treatment of psychiatric conditions. Though his practice focuses on medication management, Dr. Wong advocates for a holistic approach to treatment. He may incorporate elements of various psychotherapies, including supportive, cognitive-behavioral (CBT), and insight-oriented therapy. At times, Dr. Wong may believe that additional therapy is needed for the best outcome and recommend that you bring a dedicated therapist into your care team. Dr. Wong completed his undergraduate studies at Tulane University. He received his medical degree from Louisiana State University New Orleans School of Medicine, then completed his residency training in general psychiatry at Thomas Jefferson University Hospital in Philadelphia, PA. Dr. Wong has experience working with patients of widely varying backgrounds and socioeconomic statuses. He works primarily with adult patients struggling with depression, anxiety, trauma, and grief. ‍

Dr. Rashelle Tomlinson earned her Bachelor of Science from the College of William and Mary and her medical degree from the University of Virginia School of Medicine. She completed Psychiatry Residency and Child and Adolescent Psychiatry Fellowship training at the University of South Florida and is board certified by the American Board of Psychiatry and Neurology. She has practiced in outpatient settings, both in-office and via telemedicine, and has prior experience in inpatient psychiatry and consult liaison work within hospital systems.

Dr. Tomlinson believes in a whole-body approach to treatment and healing. Her style is warm, friendly, and accepting, creating a space where patients feel seen, heard, and respected. She considers both short-term symptom relief and long-term mental and physical health when developing treatment plans.

She begins by gaining a thorough understanding of each patient’s history, current symptoms, and future goals. She explores potential roadblocks from prior treatment and collaborates on a plan that may include medication management and brief supportive therapy, all aimed at supporting whole health.

Steven Warren, PMHNP, has over 25 years of psychiatric nursing experience in both inpatient and outpatient settings. He has provided extensive individual and group psychotherapy and education, and since 2017, has offered medication management and brief therapy in a collaborative community mental health setting. Steven earned his Bachelor of Nursing in 2011 and Master of Nursing in 2017 from Indiana University, and is ANCC board-certified as a Psychiatric Mental Health Nurse Practitioner.

Steven values open and honest communication, working directly with patients to set clear, achievable treatment goals. He is dedicated to ensuring each person he works with feels heard, respected, and supported throughout their mental health journey. His approach emphasizes collaboration, empathy, and trust.

During the first session, Steven takes time to understand each patient’s history, concerns, and goals. He develops individualized treatment plans that reflect patient values, adapting them as needs evolve. Through a strong therapeutic relationship, he provides guidance and support to help patients achieve meaningful and lasting progress.

Melissa Sims, MSN, APRN, PMHNP-BC, is a board-certified psychiatric mental health nurse practitioner who is passionate about delivering high-quality, compassionate, and comprehensive mental health care. She earned her Master of Science in Nursing from the University of Alabama at Birmingham in 2022 and has since worked in both community mental health and correctional settings.

Melissa takes a collaborative approach to care, working closely with other mental health professionals, medical providers, families, and relevant support systems to ensure well-rounded treatment. She emphasizes a patient-centered, individualized approach, combining medication management with psychotherapy to meet each person’s unique needs.

Patients working with Melissa can expect a thorough evaluation, accurate diagnosis, and a personalized treatment plan tailored to their mental health goals. One of her core priorities is to empower individuals to make informed decisions about their care by providing education grounded in research, evidence-based practices, and clinical experience.

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