Cassandra Garcia-Lozano, LPC

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Dr. Matthew Hamilton is a psychiatrist who works with adults at all stages of life in improving mental health. He emphasizes a holistic approach in collaboration with patients to help them identify and achieve their goals. He has experience helping adults from a diversity of backgrounds with depression, anxiety, bipolar disorder, PTSD, panic, OCD, ADHD, substance use and autism spectrum disorder. He offers one-hour initial consultation appointments, as well as 20 to 30 minutes for follow-up visits. Dr. Hamilton received his undergraduate education at the University of Texas at Austin, his medical degree at Texas Tech University Health and Sciences Center, and completed his residency training at the University of Texas Medical Branch. During training he worked primarily with adults in local clinics and acute care hospitals in the greater Houston area. He was honored with an award for his accomplishments in psychotherapy during his senior year of residency. Dr. Hamilton offers his expertise in both medication management and psychotherapy in his practice, including cognitive, behavioral, motivational, and supportive therapies. He will collaborate with your therapist when you are working with one and may offer a referral to a specialist therapist if indicated.

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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Samantha Iannuzzi, LMHC

Staff Licensed Mental Health Counselor

Samantha Iannuzzi is a licensed Mental Health Counselor who specializes in grief and bereavement. Samantha specialized in trauma and loss in her graduate program at Pace University. It was there, where she learned the importance of talking about the inevitable and the uniqueness of each bereaved individual's experience. Before joining Talkiatry, she was both an intern and Bereavement Counselor at Calvary Hospital, where she provided both individual and group support to bereaved members of New York's five boroughs. Samantha is experienced working with both adults and young adults. Samantha provides a safe space for all her clients where they can be heard, validated, and supported in their individual process. Samantha also provides psychoeducation and coping strategies and explores ways to navigate life changes. In addition to her clinical work, Samantha has presented to many community organizations, engaged in outreach for crisis intervention and lectured for informative clinical courses. Samantha's experience and expertise with death, cumulative loss and trauma responses due to loss helps provide clients with effective treatment and a space where their experience will never be disenfranchised.

Amanda Wright, MD

Staff Psychiatrist

Dr. Amanda Wright is a board-certified adult Psychiatrist who has been in practice for ten years. Her practice offers in-depth evaluations for new patients, personalized medication management, and supportive and motivational therapy within 30-minute follow up visits. Dr. Wright's professional interest is in mind-body wellness; she believes in psychotropic medication management as one of the tenants of overall wellness and also recognizes that non-medicinal interventions such as psychotherapy can enhance patients' ability to reach their full potential. To that end, if Dr. Wright feels you would benefit from working with a therapist in conjunction to medication management, she welcomes collaboration with your therapy provider. Dr. Wright is a graduate of the University of Texas Health Science Center in San Antonio, where she completed her psychiatric internship and residency training in 2013. From 2013 through 2022 she practiced Psychiatry in Louisiana. While practicing with Ochsner Health System, Dr. Wright was recognized locally (within her practice region) as "Provider of the Month” and later, "Provider of the Quarter” for the larger system of Ochsner. These awards were based primarily on patient feedback and highlight her warm and open approach as well as her genuine care for each patient's best long-term outcomes. In 2022, Dr. Wright and her family moved back to her home state of Texas where she has been practicing both in- and outpatient Psychiatry within a hospital system in the Rio Grande Valley. The broad scope of her professional experience lends itself to working with a variety of Psychiatric issues ranging from mood to anxiety spectrum disorders. Dr. Wright looks forward to returning her focus to outpatient Psychiatry and providing compassionate, individualized care for those seeking treatment.

Brittany Stef, LMHC

Staff Therapist

Brittany Stef is a Licensed Mental Health Counselor (LMHC) in New York and a National Certified Counselor (NCC). With extensive experience in education and various clinical settings, she has supported individuals and families of all ages in overcoming diverse mental health challenges, including depression, anxiety, mood disorders, self-esteem issues, and significant life changes. Brittany is passionate about therapy and employs empowerment-driven, holistic approaches. Her techniques include Cognitive Behavioral Therapy (CBT), Dialectical Behavioral Therapy (DBT), Motivational Interviewing, Solution-Focused Therapy, and Person-Centered Therapy.

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.

Paula Wilt, MD

Staff Psychiatrist

Dr. Wilt is board certified in adult psychiatry. She earned her medical degree from Louisiana State University in New Orleans, where she also completed her four-year residency in psychiatry. Dr. Wilt takes a biopsychosocial approach to mental health and has over 13 years of experience with an array of mental health diagnoses including Depression, anxiety, ADHD, PTSD, bipolar disorder, and sleep disorders. Dr. Wilt enjoys spending time getting to know her patients and working hand in hand with them to accurately diagnose and treat the symptoms they are experiencing. Dr. Wilt employs a holistic approach to mental health with a focus on incorporating medication management and supportive therapy to improve her patients' quality of life.‍

Ali Imran, MD

Staff Psychiatrist

Dr. Ali Imran is double board-certified in Adult Psychiatry and Child and Adolescent Psychiatry by the American Board of Psychiatry and Neurology. He completed his psychiatry residency training at SUNY Downstate Medical Center. He completed his Child and Adolescent Psychiatry Fellowship at Hofstra/Northwell Zucker Hillside Hospital. He has practiced in various settings over his career, including inpatient psychiatric units, adult and child outpatient treatment clinics, urgent care centers, and emergency psychiatric treatment centers. Dr. Imran has more than five years of experience treating patients with depression, anxiety, OCD, bipolar disorder, ADHD, and learning disorders. Dr. Imran's approach is collaborative, supportive, and patient-centered.�

Grace Smith, LCSW

Staff Therapist

Grace is a LCSW, and LISW-CP licensed in Florida, North Carolina, and South Carolina. She holds a Bachelor of Science in Family and Consumer Sciences with a specialization in Nutrition from Solusi University in Zimbabwe and a Master of Social Work in Clinical Practice from Andrews University in Berrien Springs, MI. Grace has 20 years of experience providing mental health and psychotherapy services to diverse populations in various settings, including telehealth, outpatient care, residential programs for youth and adults, Assertive Community Treatment, foster care, inpatient units, intensive in-home services, and private practice. Her approach is individualized, solution-focused, holistic, and goal-oriented, emphasizing clients' strengths and fostering a positive, affirming perspective. Grace specializes in treating individuals facing anxiety, depression, trauma, low self-esteem, mood instability, anger, unresolved emotional challenges, relationship difficulties, and life transitions. She works with adults, couples, and families. Grace's therapeutic techniques include counseling for emotional and personal growth, fostering purpose and meaning, and empowering self-esteem. Grace draws on evidence-based practices tailored to each client's needs, including Trauma-Informed Care, CBT, Trauma-Focused CBT, Motivational Interviewing, Collaborative Problem Solving, Positive Behavior Support, and Family Systems approaches.

Celeste Boyd, PMHNP

Staff Nurse Practitioner

Ms. Celeste Boyd is a dual board certified Psychiatric Mental Health and Family Nurse Practitioner. She is the CEO and Founder of Metamorphosis Psyche, a psychiatric mental health resource platform. She has practiced in family medicine since 2011 and psychiatric mental health medicine since 2013. She has clinical experience and expertise in substance use disorders, addiction rehabilitation, sleep medicine, general psychiatry, and serious mental illness (SMI) in both private and public sectors. In Academia, she has extended her knowledge and experience as Adjunct Clinical Faculty at School of Nursing Graduate Programs.

Since 2017, Ms. Boyd has been practicing general psychiatry in the outpatient private sector. Ms. Boyd provides medication management and psychotherapy for acute, chronic, and comorbid psychiatric conditions that include Anxiety Disorders, Depression, Mood Disorders, ADHD, OCD, and PTSD. Her clinical treatment modalities include supportive therapy, solution-focused therapy, motivational enhancement, mindfulness, and cognitive behavioral therapy.

As a clinician, she promotes mental health awareness to reduce stigmatization and empower those suffering and struggling with mental illness. Ms. Boyd clinical practices are oriented towards the Mental Health Recovery Model, which permits individuals to go through an active process of change, being in control, strengthening, and empowering themselves to improve their mental health and well-being.

David Guggenheim, PsyD

National Director of Psychotherapy

Dr. David Guggenheim is an experienced clinical psychologist and health care administrator. He has worked with patients at different stages of life, including children, adolescents, and adults, and he has treated patients living with a wide range of mental health conditions, including anxiety, depression, post-traumatic stress disorder (PTSD), substance use, and attention-deficit hyperactivity disorder. Dr. Guggenheim has specific training in Trauma-Focused Cognitive Behavioral Therapy, Motivational Interviewing, and foundational training in dialectical behavioral therapy. Prior to joining Talkiatry, Dr. Guggenheim served as the Chief Behavioral Health Officer at Callen-Lorde Community Health Center in New York City, specializing in LGBTQ+ health care. In that role, he oversaw teams of providers including psychiatrists, psychologists, and social workers, who collectively provided care to thousands of patients in the New York metropolitan area. While at Callen-Lorde, he also served as co-chair for the behavioral health subcommittee of the Community Health Center Association of New York State; worked as an Adjunct Professor at Post University; and performed volunteer clinical work at the Weill Cornell Center for Human Rights. Before joining Callen-Lorde, Dr. Guggenheim worked as Associate Chief Behavioral Health Officer at Community Health Center, Inc., a federally qualified health center in Connecticut. A recognized expert, Dr. Guggenheim has delivered lectures to audiences ranging from medical schools to corporate executives, and he has been quoted in national media including The Advocate, Yahoo Finance, and Teen Vogue. Dr. Guggenheim has also been honored with an Early Career Achievement Award from the American Psychological Association in 2016. Dr. Guggenheim received his Bachelor of Arts from the University of Connecticut in 2002 and his Doctor of Psychology in Clinical Psychology from the American School of Professional Psychology at Argosy University/Washington, DC in 2009.

Cassandra Garcia-Lozano, LPC

Education and training

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