Samuel Russell, MD

Dr. Fisher is a psychiatrist with over 20 years of experience in adult psychiatry, military health, addiction medicine, business leadership, and executive consultation.  His background has given him the opportunity to work with a diverse range of individuals, and he brings that breadth of experience to every patient relationship. In addition to his medical training, Dr. Fisher completed advanced training in psychodynamic and person-centered psychotherapy, which helps him provide care that’s not only evidence-based, but also deeply respectful of each person’s unique story.

Patients often describe Dr. Fisher as easygoing, kind, and patient. He takes pride in being someone who truly listens. he strives to create a safe, nonjudgmental space where you can be yourself—no matter where you're starting from. His goal is to meet you where you are, both emotionally and practically, and help you move toward where you want to be.

Dr. Fisher's approach is collaborative and flexible. He begins by getting to know you—your history, your concerns, and your goals. From there, we work together to create a treatment plan that may include therapy, medication, or both, depending on what’s appropriate for your needs. He integrate both psychodynamic insight and person-centered techniques, always with an emphasis on mutual respect and open communication. Progress takes time, and he's here to support you every step of the way.

David Arabie is a licensed professional counselor and certified tobacco treatment specialist with extensive experience working in the mental health field. David has worked directly with clients from various demographics and in various clinical settings, from inpatient hospitals, outpatient clinics, private practice, to working with the incarcerated. David has a long history of working with clients with an array of mental health conditions and challenges, from mood disorders, adjustment-related issues, addiction, family dynamics, relationship issues, emotional trauma, behavioral issues, anger management, and clinical anxiety and depression. He has a working knowledge of psychotropic medications to help with med-compliance and treatment barriers. David obtained undergraduate and graduate degrees from the University of Houston Clear Lake in Houston, Texas. David has been practicing as an LPC for 19 years but has also worked as a Licensed Chemical Dependency Counselor before obtaining his LPC. Working with David, treatment is tailored to the individual, so the goals of therapy can be met, and the client can experience a sense of vested interest in their own emotional contentment and growth. David uses an eclectic approach to therapy, with a strong foundation in Solution-Focused Therapy, Cognitive-Behavioral Therapy, and Rational Emotive Behavioral Therapy. Personally, David is a musician, community theater actor, educator, coach, and swim official.‍

Megan is a Board-Certified Psychiatric Mental Health Nurse Practitioner specializing in medication management and various therapeutic techniques. She earned a Master of Science in Nursing as a Psychiatric Nurse Practitioner from Regis College and has board certification from the American Nurses Credentialing Center (ANCC).

Megan has extensive experience in psychiatric settings, including private practice, inpatient facilities, and substance use treatment programs. She has worked on community initiatives, such as the Mobile Suboxone Van program, which provides treatment to individuals in high-need areas.

She utilizes evidence-based practices in treating clients with mood and anxiety disorders, ADHD, trauma, and substance use disorders, among other mental health disorders.

The first priority is establishing a therapeutic relationship and providing adequate support, which can substantially impact outcomes. The combination of medication management and therapy can effectively reduce symptoms and contribute to the remission of mental health symptoms.

The first session will involve a 60-minute psychiatric evaluation to gather history and discuss current symptoms and goals. Clients starting medication will need more frequent 30-minute follow-up appointments for medication management and therapy, ensuring a positive response to treatment.

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Dr. Erica Mark is a board-certified psychiatrist with experience in both inpatient and outpatient care. She formerly served as a Staff Psychiatrist at a VA Medical Center, where she specialized in the mental health needs of veterans. Dr. Mark earned her B.S. in Biological Sciences, Summa Cum Laude, from Hampton University, received her MD from the University of Texas Medical Branch, and completed her psychiatry residency at Tulane University School of Medicine, serving as Chief Resident in 2017.

Dr. Mark fosters a warm, supportive environment where patients feel heard and respected. She values open communication and works collaboratively to set clear, personalized treatment goals. Deeply committed to service, she has supported underserved and marginalized communities through various nonprofit initiatives.

During initial sessions, Dr. Mark takes time to understand each patient’s history, concerns, and goals. She then creates individualized treatment plans aligned with each patient's unique needs and preferences. Dr. Mark encourages ongoing dialogue to adapt care plans and support long-term progress.

Dr. Corey Greenwald is a board-certified psychiatrist with years of experience treating patients in both acute inpatient psychiatric emergencies and outpatient medication and psychotherapy settings. He earned his medical degree from Brown University, completed his internship in the Columbia system, and pursued residency training at Mount Sinai Medical Center in New York City. Dr. Greenwald has practiced in academic, urban, suburban, and rural environments, which has given him broad perspective and adaptability in caring for diverse patient populations.

Dr. Greenwald emphasizes psychoeducation as a core part of care, ensuring patients are active participants in understanding and managing their mental health. He brings a deep interest in transcultural issues and in how social media and news cycles impact emotional well-being. Having witnessed the effects of mental illness within his own family, Dr. Greenwald approaches his work with empathy, insight, and a strong commitment to helping patients feel supported throughout their journey.

Dr. Greenwald works collaboratively with patients to define or clarify concrete treatment goals by the end of the initial appointment. He maintains a low threshold for revisiting and adjusting treatment plans if progress feels unsatisfactory, ensuring care remains flexible and effective. His informal, eclectic interpersonal style allows him to tailor his approach to each individual, fostering trust and partnership in the therapeutic process.

Background and credentials

Dr. Nereida Gonzalez-Berrios is a general psychiatrist fluent in English and Spanish. She earned her bachelor’s degree in Microbiology from the University of Puerto Rico and her medical doctorate from Ponce School of Medicine (now Ponce Health Sciences University). She completed her General Psychiatry Training Program at the University of Puerto Rico Medical Sciences Campus, graduating in 2008. After practicing privately in Puerto Rico, she relocated to Texas, where she worked for over five years at the Michael E. DeBakey VA Health System, providing mental health care to veterans. She has also gained extensive experience in telemedicine, working both within the VA system and as a locum tenens provider.

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Treatment approach

Dr. Gonzalez-Berrios has extensive experience treating a wide range of psychiatric conditions, including mood disorders, anxiety disorders, psychotic disorders, intellectual impairment, ADHD, eating disorders, PTSD, and personality disorders. She integrates traditional psychiatric treatment with a holistic wellness approach, drawing on her background as a motivational speaker, wellness coach, certified personal fitness trainer, nutrition coach, and weight-loss specialist. Her approach emphasizes improving overall mental and physical well-being through personalized treatment plans that incorporate psychiatric care, wellness strategies, and lifestyle modifications.

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What you can expect in a first visit

Patients can expect a comprehensive psychiatric evaluation where Dr. Gonzalez-Berrios carefully assesses their symptoms, medical history, and personal wellness goals. She takes a collaborative and patient-centered approach, ensuring that treatment is tailored to each individual’s mental and physical health needs. As an experienced telemedicine provider, she offers accessible and flexible mental health care, combining medication management and holistic wellness strategies to help patients achieve lasting well-being.

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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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