Cassandra Garcia-Lozano, LPC

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Michael Russell is a licensed mental health counselor with extensive experience in the mental health field. Michael has worked directly with clients living with various mental health conditions. He attended Undergraduate and Graduate school in Queens, NY. Michael works on continuing to expand upon his experience and knowledge in the mental health field by attending trainings and receiving certifications in niche areas. Michael has been practicing for 6 years as a Clinical Mental Health Counselor, focusing on anxiety and mood disorders and life challenges, which may impact daily life. He likes to tailor treatment to each individual so that it fits that individual's specific needs. Michael uses an integrative approach with a foundation in Cognitive Behavioral Therapy and Person-Centered Therapy.

Nereida Gonzalez-Berrios, MD

Staff Psychiatrist

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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Lea Wersan, LCSW

Staff Therapist

Lea Wersan is a licensed clinical social worker with extensive experience working in the mental health field. She has worked directly with clients of various demographics, living with a variety of mental health conditions. Lea attended undergraduate school in Queens, NY and graduate school in New York, NY. Lea has been practicing for 3 years as a Clinical Social Worker, focusing on anxiety disorders, trauma and life transitions. Her approach is person-centered and trauma informed, focusing on the client as a whole. Working with Lea, treatment is tailored to each individual client, as great effort is put into choosing the treatment modalities that fit the individual's personal needs. Lea uses an eclectic approach with a foundation in cognitive behavior therapy and dialectical behavior therapy, which are intertwined with mindfulness.

Myleka Garnett, LMFT

Staff Therapist

Myleka Garnett is a Licensed Marriage and Family Therapist and a Licensed Professional Clinical Counselor. Myleka attended Baruch College in New York City, where she received her Bachelor of Arts degree, along with receiving her Master of Arts degree in Psychology from Brandman University in Monterey, California. While working towards her goal to become a licensed Therapist, Myleka completed 3000 supervised clinical hours. Myleka has been a part of the Mental Health field since 2016. Myleka has experience working with clients of all ages, backgrounds, and mental and physical health concerns. Myleka has worked in school settings (elementary, high school, and college) and in a primary care physician's office as an on-site mental health therapist. Myleka's main goal is to build rapport and to provide a safe and nonjudgmental space for all to feel comfortable when expressing how they feel, no matter what the topic of discussion may be. Myleka has provided individual and group therapeutic services, depending on what is most suitable for that specific person. Myleka enjoys using Cognitive Behavioral Therapy (CBT) when explaining the importance of how our thoughts have an impact on our emotions and our behaviors/actions. Myleka also practices using client-centered and DBT approaches within therapy.

KaShunda Davis, LPC

Staff Licensed Professional Counselor

KaShunda "Shun” Davis is a Licensed Professional Counselor in Texas. She received her Master of Science in Counseling at Amberton University and postgraduate studies in Professional Counseling and Development at Lamar University. Shun has worked in various settings in the mental health field including community-based counseling centers, private practice, and large group practices providing counseling services to adults, couples, and adolescents. Her professional experience has focused on mood disorders (depression, bipolar disorder, persistent affective disorder), anxiety, trauma, personality disorders, self-esteem and confidence, gender identity and LGBTQIA+ concerns; relationship concerns, and life transitions. Shun's integrative therapeutic style provides an emotionally safe space that supports self-exploration, empowerment, and authenticity. Specializing in cognitive behavior therapy, dialectical behavior therapy, trauma-focused therapy, narrative therapy, and mindfulness; she tailors her approach to meet the unique needs of each individual. She is dedicated and passionate about assisting individuals to work through barriers to create the lives and relationships that they desire and to develop a sense of personal strength and self-acceptance. She celebrates and welcomes the diversity of all clients and strives to create an affirming, inclusive, and non-judgmental space to explore individual needs and therapeutic goals.

Jessica Brusgul, LMHC

Staff Therapist

Jessica Brusgul is a LMHC with over nine years of experience working with individuals with a wide range of mental health challenges. She attended Oswego State and completed her undergraduate degree as an older, non-traditional student. She then pursued graduate school at SUNY Oswego, which she completed in 2016. During this time, Jessica has gained a great deal of experience with clients from various backgrounds who are faced with numerous life challenges. This includes anxiety, depression, relationship issues, and those in need of anger management. Jessica has also worked with those faced with substance abuse related problems, life transitions, career counseling, and parenting education. Her approach is to get to know her clients, their presenting concerns, and some history as well. Through these conversations, Jessica helps her clients feel comfortable in a non-judgmental setting and express themselves freely. Jessica also incorporates a sense of humor, when appropriate, as well as assisting people in identifying their inner strengths and skills. Jessica believes that everyone can overcome their obstacles and make positive changes for themselves. She incorporates such modalities as encouraging clients to maintain a journal and share entries during session, exercise regularly, and begin their journey towards overall wellness. Jessica has found that an eclectic approach, depending upon the needs of the individual, and the client's adherence to this between sessions, can be highly beneficial.

Karelis Sierra-Cintron, MD

Staff Psychiatrist

Dr. Sierra-Cintron is board-certified in adult psychiatry by the American Board of Psychiatry and Neurology and has been in practice for 12 years. Dr. Sierra-Cintron focuses her practice on medication management. She also engages in supportive therapy in a comprehensive way, focusing on the patient as a whole and not just the symptoms. Dr. Sierra-Cintron has a broad understanding of vitamin support as an adjunctive treatment to traditional medication. She has broadened her understanding of second-line treatment, having been certified in Electroconvulsive Therapy (ECT), conducting clinics in Clozapine and Long-Acting Antipsychotics (LOA), and even conducting assessments for patients interested in weight loss surgery. Dr. Sierra-Cintron has a comprehensive approach to treatment, and might consider the addition of therapy, either by referral or collaborating with an existing therapist for a more rounded approach and improved outcome. Dr. Sierra-Cintron received her medical degree from the Universidad Central del Caribe located in Bayamon, Puerto Rico. Upon graduation, she relocated to Philadelphia, where she started her residency program at Einstein Medical Center. After completing her training, she worked for 8 years in a community mental health clinic, treating an underserved population in all modalities of psychiatric care. In her 12-year career, Dr. Sierra-Cintron has treated both adult males and females, including seniors. This has led to varied and wide-ranging diagnoses during the length of her career. After leaving the community clinic setting, she started working for an outpatient clinic in a suburb of Philadelphia. Dr. Sierra-Cintron's current areas of focus are adults with Mood Disorders, Anxiety Co-Occurring Substance disorders, as well as patients with varied concomitant medical problems.‍

Kristina Bona, LPC

Staff Therapist

Kristina Bona is a Licensed Professional Counselor with extensive experience working in the mental health field. Kristina received her bachelor's from The University of Texas at Austin and proceeded to obtain her Master's degree in Counseling from The University of Texas at San Antonio. Since graduating with her Master's, she has worked in the mental health field, providing mental health relief to a wide demographic of clients. Over the past 10 years, Kristina has worked for various agencies, ranging from the local mental health authority to private practice. Kristina has experience working with people experiencing Anxiety, Depression, Mood disorders, and other mental health diagnoses interfering with daily living. As a clinician, she meets the client where they are in their life and tailors her treatment style to help them learn/apply strategies in developing skills for emotional regulation, developing healthy boundaries, effective communication skills, and more. Kristina uses an eclectic blend of cognitive behavioral therapy, dialectical behavioral therapy, solution-focused therapy, and mindfulness to increase the clients' resiliency and autonomy and empower them to live full lives.

Kazi Hossain, MD

Staff Psychiatrist

Dr. Kazi Hossain is a board-certified psychiatrist with a strong commitment to providing compassionate and comprehensive mental health care. Dr. Hossain developed an early interest in the biological sciences, which led him to pursue a Bachelor's degree in Biology from George Mason University. He earned his medical degree from the American University of Antigua College of Medicine in 2012 and subsequently completed his psychiatry residency at East Carolina University, graduating in 2016. Most recently, Dr. Hossain has served as an inpatient psychiatrist in Florida, where he has been dedicated to supporting individuals during their most vulnerable moments. His approach combines clinical expertise with a genuine understanding of his patients' diverse backgrounds and experiences. Dr. Hossain is deeply aware of the cultural nuances that can influence mental health. He takes pride in bringing this perspective to his practice, ensuring that every patient feels seen, heard, and respected. Dr. Hossain is passionate about giving back to the community. He regularly hosts seminars to raise awareness about mental health, break stigmas, and encourage open, meaningful conversations. His dedication to psychiatry stems from a desire to make a difference in the lives of his patients. Dr. Hossain's combination of professionalism, empathy, and cultural understanding makes him a trusted partner in his patients' journeys toward healing and well-being.

Thayanne Delima-Tokarz, DO

Staff Psychiatrist

Dr. Delima-Tokarz is double Board Certified in Psychiatry and Lifestyle medicine. She completed her psychiatry residency training at the University of Maryland/Sheppard Pratt, where she served as the chief resident. She has practiced in various settings over her career, including working for the Department of Defense, private practice, and community mental health. Dr. Delima-Tokarz is fluent in Portuguese, English, and Spanish. Dr. Delima-Tokarz has more than five years of experience treating patients with anxiety, depression, PTSD, Bipolar, OCD, ADHD, and other mental health issues. She employs pharmacotherapy along with supportive therapy and integrative approaches. Dr. Delima-Tokarz is currently working on completing her Ph.D. in Integrative Medicine and is passionate about a holistic and integrative approach to mental health. Her philosophy includes a healing-oriented approach that considers the whole person, including all lifestyle aspects. Dr. Delima-Tokarz aims to provide collaborative and comprehensive care, which may include medication management, lifestyle interventions, stress reduction techniques, and other integrative approaches. She believes building a strong therapeutic relationship where the patient feels empowered is the key to healing.‍

Sumeet Singh, MD

Staff Psychiatrist

Dr. Sumeet Singh is board-certified by the American Board of Psychiatry and Neurology in General Adult Psychiatry. He completed his psychiatry residency training at Howard University Hospital and Saint Elizabeth's Hospital in Washington, DC., where he was voted as Chief resident. He went on to serve as vice chair of the Department of Psychiatry at Adventist HealthCare in Maryland, where he worked in both an administrative and clinical role treating adults in inpatient settings. Additionally, he served as a Clinical Instructor of Psychiatry at Georgetown University School of Medicine, teaching medical students about the art of medicine. Dr. Singh received his undergraduate degree in Neuroscience from the University of Michigan and received his medical degree from Xavier University School of Medicine. Most recently, Dr. Singh worked for Life Stance Health, an outpatient telehealth company, where he treated patients between the ages of 18-65 years old with both medication management and therapeutic interventions. Dr. Singh has years of experience treating the following disorders/diagnoses: depression, anxiety and panic attacks, bipolar disorder, PTSD, ADHD, and OCD.‍

Sallie Jo Hadley, MD

Staff Psychiatrist

Dr. Sallie Jo Hadley holds the position of Staff Psychiatrist at Talkiatry. She is board-certified in psychiatry and pediatrics and is board-eligible in child and adolescent psychiatry. She has been practicing for 22 years. Dr. Hadley's practice is focused on medication management with supportive therapy in follow-up sessions of 15 or 30 minutes. Dr. Hadley is experienced with collaborative treatment and encourages adding a therapist to your care team in those situations where additional therapy might be helpful. Dr. Hadley is a graduate of the Mount Sinai School of Medicine's triple-board program (psychiatry, pediatrics, and child and adolescent psychiatry). She completed post-doctoral research fellowships at Mount Sinai's Seaver Center for Autism Research/Compulsive-Impulsive Anxiety Disorders and at Columbia University's New York State Psychiatric Institute, the latter focusing on metabolic and weight issues in children and adolescents with psychiatric disorders. Dr. Hadley had an early background as a nurse, receiving her B.S. in Nursing from the University of North Carolina-Chapel Hill. Her experience in neonatal, psychiatric, and hospice nursing led her to pursue her degree in medicine. Dr. Hadley has worked in pharmacologic research in both academic and industry settings. Prior to joining Talkiatry, she practiced in a multi-specialty clinic for individuals and families dealing with autism or intellectual disabilities and complex medical co-morbidities. Dr. Hadley enjoys working with motivated individuals of all ages who are seeking to better their life or better cope with life circumstances. She has particular expertise in working with individuals and their families suffering from anxiety, depression, and obsessive-compulsive disorders.

Cassandra Garcia-Lozano, LPC

Education and training

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