Briana Mathews, MD

Margaret Mary Reyes, MSN, APRN, PMHNP-BC, is a board-certified Psychiatric Mental Health Nurse Practitioner committed to delivering patient-centered and compassionate mental health care. A proud Florida native, she earned her Bachelor of Science in Nursing (BSN), Master of Science in Nursing (MSN), and post-master’s certification in Psychiatric Mental Health Nursing from Florida Atlantic University (FAU). Her academic research focused on improving outcomes for women living with Premenstrual Dysphoric Disorder (PMDD).

Margaret has advanced practice experience in both inpatient and outpatient psychiatric settings. She has treated individuals with a wide range of mental health conditions, including psychotic disorders, bipolar spectrum disorders, depressive and anxiety disorders, trauma-related disorders, attention deficit disorders, personality disorders, substance use and co-occurring disorders, eating disorders, suicidality, homelessness, and severe mental illness (SMI) within the criminal justice system. Her clinical background also includes acute care experience in oncology, medical-surgical, telemetry/cardiac step-down, intensive care, nursing research, and consultation-liaison psychiatry.

She takes an integrative and comprehensive approach to mental health care, combining medication management with evidence-based complementary and alternative interventions. Her practice is grounded in the understanding of the mind-body-spirit connection and the gut-brain axis. Margaret incorporates supportive therapy, motivational interviewing, and mindfulness-based cognitive techniques to support her patients’ overall well-being.

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Dr. Michelle Zaydlin is a board-certified psychiatrist who has experience in caring for diverse patient populations presenting with an array of diagnoses. Her interests include neurodevelopmental disorders (autism, ADHD), mood disorders, anxiety, trauma, and comorbid medical conditions. She has completed internships in pediatric neuropsychology and worked as a behavior therapist, delivering Applied Behavior Analysis (ABA) therapy, enriching her understanding of development and neurocognitive functioning. Additionally, Dr. Zaydlin actively participates in research and is actively engaged in educational initiatives for other healthcare providers. Dr. Zaydlin believes in a collaborative and compassionate approach to mental health care. She works with patients across their lifespans, integrating psychopharmacology and psychotherapy. She integrates cultural sensitivity with evidence-based practices to provide individualized, holistic care. Her empathetic approach and clinical knowledge enable her to foster meaningful connections with her patients and facilitate positive treatment outcomes.

Dr. Rania Elkhatib is a board-certified general psychiatrist with extensive experience in clinical care, teaching, and research. She earned her medical degree from the University of Texas Medical Branch in Galveston and completed her psychiatry residency at UTHealth Science Center in Houston, where she later served as an Assistant Clinical Professor. During that appointment, Dr. Elkhatib was heavily involved in medical education and has developed courses in cultural psychiatry and psychiatry boot camps for medical students.

Dr. Elkhatib specializes in treating a wide range of psychiatric conditions, including Major Depressive Disorder, Anxiety Disorders, Bipolar Disorder, OCD, ADHD, and PTSD. Dr. Elkhatib focuses on evidence-based medication management but will also incorporate supportive therapy and cognitive-behavioral techniques to optimize treatment management and patient’s wellness. She is fluent in Arabic and English and has a strong interest in working with diverse patient populations.

Dr. Elkhatib has a holistic approach with focus on medication management while incorporating supportive therapy and cognitive-behavioral techniques to optimize patient wellness.

Background and credentials    

Dr. Catherine Cashman is triple board-certified by the American Board of  Psychiatry and Neurology in Adult Psychiatry, Child & Adolescent  Psychiatry, and Forensic Psychiatry. She holds two Bachelor’s degrees: one in  Finance from New York University, and another in Biology from the University  of New Orleans. She earned her medical degree from Nova Southeastern  University and completed an Adult Psychiatry residency at LSU Health Sciences  Center in New Orleans. Dr. Cashman subsequently completed two fellowships:  the first in Child & Adolescent Psychiatry at LSU New Orleans, along with  a certification in Infant Mental Health (working with children ages 0–6 years  and their caregivers); the second fellowship was in Forensic Psychiatry at  the University of Rochester and the Rochester Regional Forensic Unit.    

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Treatment approach    

Dr. Cashman brings an extensive and specialized skillset to psychiatry,  informed by her triple board-certifications. Her treatment approach  integrates clinical expertise from adult, child and adolescent, and forensic  psychiatry, emphasizing accurate diagnosis, risk assessment, and  evidence-based care. With specialized expertise in forensic psychiatry and  competency assessments, she employs rigorous evaluation methods to accurately  inform treatment planning and risk management, particularly in complex or  legally-involved cases.    

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What you can expect in a first visit    

Patients visiting Dr. Cashman for the first time can expect a detailed and  comprehensive psychiatric evaluation. Given her forensic and clinical  experience, initial assessments are thorough, focusing on clear diagnostic  understanding, individualized risk assessment, and appropriate treatment  planning. Patients can anticipate a collaborative, professional, and  structured environment aimed at clarifying diagnoses and addressing their  unique mental health needs effectively.    

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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. Ruchir Arvind is an Adult General psychiatrist. He is a Diplomat of the American Board of Psychiatry and Neurology. He has been practicing for 4 years.

Dr. Arvind believes in collaborative and educational approaches to address his client’s needs. He believes that therapy is a foundational part in building a long term therapeutic relationship with his clients. He tries to put some educational part in helping his client’s to have a deeper understanding about their illness and related struggles and needs. He likes to follow up closely regarding progress towards his client’s goals. He integrates psycho education in all sessions into explaining his reasoning behind the choice of treatment options based on evidence based medicine. He also provides a brief supportive psychotherapy and Cognitive Behavioral Therapy to aid in treatment for depression, anxiety and insomnia.

Dr. Arvind received his medical degree from PramukhSwami Medical College in India and completed his residency training at University of Texas Health Science Center in his Hometown of Houston, Texas. He held an academic position as a faculty with University of Texas Health Science Center – McGovern Medical School in Houston as assistant professor and enjoyed teaching opportunities.

During his pursuit for residency training in psychiatry Dr. Arvind had been extensively involved in clinical research understanding neurobiological and psychological aspects of development of different anxiety disorders and bipolar disorders as early as in childhood populations. He has had Publications for several peer-reviewed articles and manuscripts and presentations at annual conferences.

Dr. Arvind has experience in treating versatile patient populations. His areas of focus have been anxiety disorders, Acute stress and Post traumatic stress disorder, Attention Deficit Hyperactivity Disorder( ADHD ) and Attention Deficit Disorder ( ADD ) , Tics  and Tourette Syndrome ,Insomnia and depression. He has also worker with adults with Bipolar illness and pregnancy related anxiety and depression and helping clients with any psychiatric illness due to underlying neurological issues like Seizures, Multiple Sclerosis and NeuroCognitive Issues along with addressing Caregiver Burden for some clients.

Patients looking for a psychiatric provider will find Dr. Arvind’s approach in a gentle, friendly and educational way with a composed demeanor. He tends to approach Individualized treatment plans based on different needs for different clients and will always welcome any questions regarding the plan to reach Client’s Goals.

Lance Briggs is a dedicated Psychiatric Nurse Practitioner with over a decade of clinical and leadership experience. A graduate of the University of North Dakota, Lance began as a psychiatric RN in acute inpatient settings before becoming a psychiatric RN supervisor in a major Houston hospital while pursuing advanced practice.

After becoming a PMHNP, Lance initially worked with outpatient addiction treatment and severe mental illness populations, later expanding into bariatric psychiatry to support patients preparing for weight-loss surgery. When the COVID-19 pandemic paused bariatric procedures, Lance founded a private practice—Grey Matters Mental Health—in Seattle, which was later sold to a larger healthcare organization in Minnesota. Lance then transitioned into correctional mental health, serving underserved populations within the criminal justice system. Currently, Lance is working at Talkiatry, providing compassionate, high-quality care informed by experience across diverse and challenging environments.

Lance understands that every patient is unique. His approach is grounded in Carl Rogers’ principle of unconditional positive regard, creating a safe, calming space where patients feel heard and valued. Lance takes time to explore developmental history, family background, and major life events, recognizing how past experiences shape present challenges. He aims to understand each symptom fully and offers thoughtful, collaborative treatment options.