Celeste Boyd, PMHNP

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Margaret Mary Reyes DNP, APRN, PMHNP-BC is a board certified Psychiatric Mental Health Nurse Practitioner dedicated to providing patient centered, and compassionate mental health care. As a Florida native, she is a proud graduate of Florida Atlantic University (FAU), where she obtained her Bachelor of Science in Nursing (BSN), Master of Science in Nursing (MSN), and Doctor of Nursing Practice (DNP) with a specialty in Psychiatric Mental Health Nursing. Her doctoral research focused on improving outcomes for women living with Premenstrual Dysphoric Disorder (PMDD).

Dr. Reyes has advanced practice nursing experience in both inpatient and outpatient psychiatric settings. She has cared for individuals with a wide variety of mental health conditions such as Psychotic disorders, Bipolar spectrum disorders, Depressive and anxiety disorders, Trauma-related reactions/disorders, Attention deficit disorders, Personality disorders, substance use disorders, co-occurring disorders, Eating disorders, Suicidality, Homelessness and Severe mental illness (SMI) in the criminal justice system. She also has acute nursing practice experience in oncology, medical-surgical, telemetry/cardiac step-down, intensive care, and nursing research, as well as in Consultation Liaison Psychiatry while in graduate training.

Dr. Reyes implements an integrative and comprehensive approach to mental health care. She focuses on a combination of medication management and evidence based complementary and alternative interventions, with respect to the interconnectedness between mind, body, and spirit as well as the gut-brain axis. She utilizes supportive therapy, motivation interviewing and mindfulness cognitive based therapeutic techniques.

Cassandra Thomas-Jingles, PMHNP

Staff Nurse Practitioner

Cassandra Thomas-Jingles is a dedicated board-certified Psychiatric Nurse Practitioner, who also holds dual certification as a Family Nurse Practitioner. She is very passionate about helping others, she takes a holistic and evidence-based approach to mental healthcare, empowering her patients to live life to their fullest potential. Her practice specializes in medication management and supportive therapy, offering 30-minute follow-up sessions. She recommends incorporating a therapist into the care team to ensure the best possible outcomes if additional therapy is needed. With extensive experience in both outpatient and inpatient settings, Cassandra has worked with adults and children facing a range of mental health conditions, including ADHD, anxiety, depression, and psychotic disorders. She strongly believes in prioritizing the client’s involvement and interprofessional collaboration.

Your mental health journey is unique, and Cassandra is here to listen with compassion and without judgment. Our conversations are confidential, and Cassandra's goal is to create a space where you feel comfortable sharing your thoughts and concerns. During our first appointment, Cassandra will go over your mental health history, current symptoms, lifestyle factors, and any previous treatments to get a full picture of your needs. We will develop a treatment plan that may include therapy, medication, or other supportive strategies. Cassandra believes in shared decision-making, meaning your input is important in every process step. If medication is part of your treatment, Cassandra will provide clear information about its benefits and potential side effects and how we will monitor your progress. Adjustments can be made as needed to ensure the best possible outcome. Healing takes time, and Cassandra will support you throughout the process. Follow-up appointments help us track progress, make any necessary adjustments, and ensure you receive the care you need.

Your mental health journey is unique, and Cassandra is here to listen with compassion and without judgment. Our conversations are confidential, and Cassandra's goal is to create a space where you feel comfortable sharing your thoughts and concerns. During our first appointment, Cassandra will go over your mental health history, current symptoms, lifestyle factors, and any previous treatments to get a full picture of your needs. We will develop a treatment plan that may include therapy, medication, or other supportive strategies. Cassandra believes in shared decision-making, meaning your input is important in every process step. If medication is part of your treatment, Cassandra will provide clear information about its benefits and potential side effects and how we will monitor your progress. Adjustments can be made as needed to ensure the best possible outcome.
Healing takes time, and Cassandra will support you throughout the process. Follow-up appointments help us track progress, make any necessary adjustments, and ensure you receive the care you need.

Bryce Thacker, PMHNP

Staff Nurse Practitioner

Bryce Thacker grew up in a rural community. He learned to be part of a community where helping everyone achieve their “best ‘selves” meant improving/maintaining community health and helping the community thrive. With his passion for helping people live “their best lives”, he received his undergrad in biology from the University of Nebraska and Creighton University where he majored in nursing. He obtained a Master of Science majoring in nursing (Family Nurse Practitioner) and Community health from Creighton University, and a Doctor of Nursing Practice from the University of Colorado where he focused on population and community health. He then obtained a post doctorate/graduate certification in psychiatric mental health from Washburn University.

Bryce practiced for 18 years in family practice before specializing in psychiatric mental health. This helped him gain a holistic view of mental and physical health. Since focusing on psychiatric mental health in 2022, he has helped people live “their best lives” through medication management. Whether mood disorders, PTSD, anxiety, ADHD, or other mental health conditions which may disrupt your desired QOL, he would like to be part of your journey to achieve your desired mental health goals. Bryce still lives in a rural community with his family and continues to enjoy being part of helping people live “their best ‘selves”.

Bryce understands that his goals are not your goals, and that everyone’s “best ‘self” is unique to them. He understands “meeting someone where they are at” regarding their mental health is important when helping them on their journey to “living their best life” and having a quality of life they desire. He will always keep you at the center of your care and would love to be part of your journey to achieve your mental health goals in a safe, sustaining way.

Bryce will take time to learn about you and understand what adverse symptoms are disrupting your quality of life, and how they impact your ability to “live your best self”. Keeping your personal quality of life goals at the center, he will work with you to help overcome self-defeating thoughts and mental health labels you may have been told there is only a certain way to achieve goals that may not even be your goals. Finding a safe, sustainable way for you to achieve your desired quality of life in a holistic approach will always be at the center of your care.

Lena Champlin, PMHNP

Staff Psychiatric Nurse Practitioner

Lena Champlin, PMHNP-BC is a dual certified Family Practice and Psychiatric Mental Health Nurse Practitioner. She received her Family Nurse Practitioner degree from the University of South Florida and her Psychiatric Mental Health Nurse Practitioner degree from Augusta University. Since beginning practice in 2013, she has worked in inpatient and outpatient settings seeing a wide range of clients. Her expertise covers psychiatric issues of all types, including anxiety, depression, mood disorders, and ADHD. She is committed to finding solutions for her clients by using a holistic approach that takes into account physical and mental issues. Treatments include therapy, medication, and lifestyle modifications. She enjoys working with clients who are motivated to change and feel better. She takes time to listen to clients and treats each as an individual.

Deborah Bearman, PMHNP

Staff Nurse Practitioner

Deborah Bearman, PMHNP, is a board-certified psychiatric nurse practitioner who is dedicated to helping those struggling with mental health concerns to live a more fulfilling life. Deborah received her Master of Science in Nursing with a specialty in psychiatry from SUNY Upstate Medical University. She is trained in psychiatric diagnosis, medication management, and psychodynamic and cognitive behavioral therapies. Over the past 10 years, she has gained valuable experience in a number of settings, including inpatient and outpatient facilities, community mental health clinics, and private practice. Deborah is devoted to addressing adult mental health from a holistic perspective, utilizing a combination of medication management with supportive counseling, which she offers during 30-minute follow up sessions. While she focuses on medication management, she believes most people benefit from therapy as well and has extensive experience in psychodynamic and cognitive behavior therapies. She also believes in providing psychoeducation to patients, families, and caregivers. As a psychiatric nurse practitioner, Deborah understands the value of the therapeutic relationship and the positive impact it can have on daily function. By working with patients to create comprehensive and effective treatment plans, Deborah supports her patients in living healthier and more satisfying lives.

Bryce Cragg, MD

Staff Psychiatrist

Dr. Bryce Cragg is a board-certified psychiatrist with over 10 years of experience in medicine, medical education, and research. He has a special interest in treating anxiety and depression, and he is passionate about helping his patients achieve their mental health goals. Dr. Cragg is a strong advocate for evidence-based treatments, and he is committed to providing his patients with the highest quality of care.

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.

Lorangelly Rivera, MD

Staff Psychiatrist

Dr. Lorangelly Rivera is board-certified in Adult psychiatry and has been practicing for over 5 years. Dr. Rivera focuses on medication management and brief psychotherapy utilizing techniques from cognitive behavioral therapy, psychodynamic therapy, and supportive therapy in 30-minute appointments. When appropriate, Dr. Rivera may recommend additional psychotherapy with a psychologist as part of the treatment plan. She is fluent in both Spanish and English and is passionate about working with the Latinx population. She completed her bachelor's degree in Cellular Molecular Biology from Metropolitan University, San Juan, Puerto Rico, and her postgraduate work at the National Cancer Institute in Bethesda, Maryland. Dr. Rivera received her medical degree from Ponce Health Sciences University School of Medicine, Ponce, Puerto Rico. She completed her residency training in psychiatry at the University of Rochester Medical Center. After completing her training, she began working for Lifespan Physician Group where she became program director for Lifespan Latinx Mental Health Services and served as Staff Psychiatrist at Rhode Island Hospital and The Miriam Hospital. She holds a faculty position in The Warren Alpert Medical School of Brown University, Department of Psychiatry and Human Behavior as a Clinical Instructor. ‍

Catherine Shim, MD

Staff Psychiatris

Dr. Catherine Shim is a board-certified psychiatrist and completed her training at the University of Washington, where she received additional certifications in Psychotherapy and Community Psychiatry. Prior to joining Talkiatry, she spent years serving the mental health needs of underserved communities as well as our Veteran population. Dr. Cat is excited to bring that same dedication and selfless service to her Talkiatry patients!

Dr. Cat is experienced in managing a multitude of mental health conditions, but her specialty is providing behaviorally oriented trauma-informed care. Her approach is to treat primarily through psychotherapy and behavioral change, with medication management serving as an important (and often essential) adjuvant to optimizing mental health.

Dr. Cat tends to have a very casual engagement style, so expect a frank but open conversation during your first meetings with her. Following that initial screening, anticipate a candid discussion about her approach to your condition and an initial treatment plan. Please feel free to bring up any questions or concerns at any time during this process, and note-taking is highly encouraged!

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Priya Mukhopadhyay, MD

Staff Psychiatrist

Dr. Priya Mukhopadhyay is a board certified adult psychiatrist. She completed her psychiatry residency training at Richmond University Medical Center in NYC. She has practiced in various settings over her career including inpatient, outpatient, comprehensive psychiatric emergency program (CPEP), and the consult liaison service to name a few. She has experience providing patients with compassionate psychiatric care treating patients with anxiety, depression, bipolar disorder, PTSD, family and relationship issues, as well as other mental health issues. Dr. Priya's practice focuses on medication management. Typically, she offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. The philosophy of her practice is to collaborate with patients to meet their specific needs and make an impact in various stages of their lives. Growing up in NYC as a South Asian American female in medicine, Dr. Priya strongly values diversity and compassion and strives to make her patients feel heard, validated, and comfortable at all times.

Nakia Roberson, LPC

Staff Therapist

Nakia is a Licensed Professional Counselor Supervisor and Certified Sex Therapist with a Master of Education in Counseling and Development from Sam Houston State University. With extensive experience in education and private practice, she has helped individuals and couples navigate life's challenges and create meaningful change. Her expertise includes issues related to sexual health, intimacy, relationships, depression, anxiety, self-esteem, life transitions, and grief and loss. Specializing in working with individuals and couples, Nakia creates a warm and supportive environment where others feel heard and empowered. She guides them in making choices to change hindering situations and gain clarity through clinical tools to interpret and respond differently to life's challenges. Her approach is collaborative and tailored, ensuring therapy meets the unique needs of each person while celebrating progress. Nakia uses a holistic approach that integrates Cognitive Behavioral Therapy (CBT), Solution-Focused Therapy, and Person-Centered Therapy. She is also trained in Gottman Levels 1 and 2, providing evidence-based techniques to strengthen relationships and improve intimacy and communication. She believes change happens when individuals are honest with themselves and willing to do the work. As Carl Rogers said, "One must accept themselves as they are before change can occur.” Nakia considers it a privilege to support others as they heal, grow, and embrace life's possibilities.

Patricia Michel-Garrison, DO

Staff Psychiatrist

Dr. Patricia Michel-Garrison is a board-certified psychiatrist by the American Osteopathic Board of Neurology and Psychiatry (AOBNP) with over a decade of experience in inpatient psychiatry. She completed her undergraduate training in Chemistry in Florida, having moved there from Chicago in 2000, followed by medical school at the Lake Erie College of Osteopathic Medicine (LECOM). She completed her residency in Psychiatry in Largo, Florida. Dr. Michel-Garrison specializes in treating adults aged 18 and over, addressing a wide range of psychiatric conditions including anxiety, mood disorders, and personality disorders. She is known for her holistic approach, integrating both traditional and osteopathic principles to provide comprehensive care. Her treatment style is patient-centered, emphasizing individualized care plans tailored to each patient's unique needs. Dr. Michel-Garrison fosters a collaborative therapeutic relationship, promoting open communication and trust with her patients. Throughout her career, Dr. Michel-Garrison has remained committed to staying current with the latest advancements in psychiatric care. She is dedicated to helping her patients achieve optimal mental health and well-being through a combination of evidence-based practices and empathetic support.

Celeste Boyd, PMHNP

Education and training

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