Lauren Treharn, PMHNP

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Glenn is a Board Certified Psychiatric Mental Health Nurse Practitioner. Glenn has spent the majority of his nearly 30-year career in Health Care working to meet the mental health needs of those in his community. With experience in both inpatient and outpatient settings, Glenn has demonstrated his commitment to helping others become the best versions of themselves regardless of where they are at during that first appointment. When not working Glenn enjoys spending time with his family, biking, and being outdoors.

Glenn is very patient centered and wants you to know he is human too. We all have struggles at times and in various ways. Glenn has a very holistic approach and understands that treatment involves addressing the impacts your challenges are having on your life as a whole. Glenn strives to provide compassionate, empathetic, and yet very practical care to all his patients.

Glenn engages patients in a way that makes it very easy and natural for them to tell their story. From there Glenn promotes a shared decision-making strategy to formulate the optimal treatment plan. Glenn has expertise in psychopharmacology, Cognitive Behavioral, Supportive, and Psychodynamic therapy.

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Hector Cardiel-Sam, MD

Staff Psychiatrist

Dr Cardiel- Sam is Board Certified in both General Psychiatry and Child and Adolescent Psychiatry. He completed undergraduate training at the University of Miami followed by medical school at St. George's University. He has completed a residency in psychiatry at Bergen New Bridge Medical Center and a fellowship training in child and adolescent psychiatry at Penn State University. ‍His training in Child and Adolescent Psychiatry has given him a unique perspective on mental illness. He has found that these conditions rarely start in adulthood, but rather, are a product of multiple factors and years of lived experience. For this reason, Dr Cardiel-Sam approaches his patients through a trauma-informed lens; an acknowledgement of the unique story and challenges that each individual has faced. He is comfortable treating a wide variety of psychiatric conditions including depression, anxiety, bipolar disorder, ADHD and many more. ‍Working with Dr Cardiel- Sam, you can expect holistic and collaborative psychiatric treatment. He believes that medication along with therapeutic treatment should fit seamlessly into a patient's life, with minimal inconvenience. He strives to empower patients in shared medical decision making, making time to explain risks/benefits and alternatives for treatment.

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.

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.

Megan Kelly Gilman, PMHNP

Staff Nurse Practitioner

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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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.

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.

Luna Sanchez Rivera, MD

Staff Psychiatrist

Dr. Luna Sanchez Rivera holds the position of Staff Psychiatrist at Talkiatry. After completing residency in 2016 at the Ponce Medical School Psychiatry Residency in Puerto Rico, she then moved to North Carolina to complete a subspecialty in Child and Adolescent Psychiatry at Duke University Health System. There, she transitioned into an assistant professor position, focused on structuring pediatric emergency psychiatric services, and helped support the consult and liaison pediatric service. Her years of experience have included working as an integrated care child psychiatrist within outpatient clinics at Duke University Health System, and she trained and worked as a staff psychiatrist at the Inpatient State Facility in North Carolina. She also served in the Dayton Children's Hospital outpatient clinics in Dayton, Ohio, the Appalachian Health System outpatient clinics in Linville, North Carolina, and more recently has been serving the Child and Adolescent inpatient population in Bangor, Maine. Dr. Sanchez Rivera has an approachable style aimed at providing a comprehensive evaluation for all age ranges and is comfortable managing various levels of diagnostic complexities. She provides supportive psychotherapy while using psychodynamic therapy skills to clarify her patient's constellation of symptoms, identify unifying themes and provide thorough psychoeducation throughout the process to drive positive outcomes. She integrates psychodynamic medication management approaches and is adept at family therapy interventions.

Mustafa Taquee, MD

Staff Psychiatrist

Dr. Mustafa Taquee is a board-certified Adult Psychiatrist. After receiving his undergraduate degree from Wayne State University in Detroit, he completed his medical degree at Oakland University William Beaumont in Rochester, MI. He is a graduate of the Adult Psychiatry Residency Program at St. Mary Mercy Hospital in Livonia, MI. As a testament to Dr. Taquee's desire to help patients reach their full potential, he has also completed a psychotherapy fellowship through the Michigan Psychoanalytic Institute. Dr. Taquee believes that every patient brings their own mosaic of experiences embedded in a unique story. He understands that building a strong therapeutic relationship through empathy, compassion, trust, and respect is essential. He enjoys taking time to understand his patient's goals, offer psychoeducation, and create a collaborative plan for treatment with the patient. He believes in a holistic approach to mental health treatment, which includes medication management, supportive and cognitive behavioral therapy techniques, as well as mind-body medicine techniques. He also has a special interest in psychodynamic therapy, an in-depth therapy modality, which he incorporates in all patient interactions and sessions. Due to the diversity and richness of culture in southeast Michigan, Dr.Taquee has experience working with patients from varied backgrounds. He enjoys the challenge such a heterogeneous environment brings and is particularly fond of working with young adults experiencing life transitions. He also has experience working with patients from lower socioeconomic backgrounds, as well as adolescents and geriatric populations.

Courtney Flynn, LCSW

Staff Therapist

Courtney Flynn, LCSW, earned her Bachelor of Social Work in 2015 and Master of Social Work in 2017 from Colorado State University in Fort Collins, Colorado. She has over a decade of experience practicing psychotherapy in the Northern Colorado region.

Courtney began her career in 2014, working with high-risk youth on parole in a residential treatment setting. In this role, she provided crisis intervention and therapeutic support to adolescents with complex trauma. In 2015, she served as a facilitator at a high school Wellness Center, supporting teens struggling with substance use, trauma, and mental health challenges by connecting them with individualized resources.

From 2017 to 2022, Courtney worked at Mountain Crest Behavioral Health Center in Fort Collins as a care coordinator and behavioral health therapist. There, she provided a wide range of services, including crisis intervention, individual therapy, family and couples counseling, group therapy, trauma-focused care, and discharge planning for adolescents and adults in an inpatient psychiatric setting.

In 2022, Courtney shifted her focus to clients with substance use disorders. She joined Northpoint Recovery in Loveland, Colorado, where she served as a primary therapist for both adolescents and adults in intensive outpatient and inpatient programs, offering individual and group therapy.

In 2023, Courtney began working at The Redpoint Center in Fort Collins, an intensive outpatient program specializing in mental health and substance use treatment. There, she facilitated individual and group therapy sessions, helping clients explore and address the underlying causes of their behaviors in a safe, supportive, and authentic therapeutic environment.

Courtney is skilled in a range of therapeutic approaches, including Dialectical Behavior Therapy (DBT), Cognitive Behavioral Therapy (CBT), Motivational Interviewing, recovery-oriented care, and Internal Family Systems (IFS). She has extensive experience working with individuals and families affected by trauma, and has successfully treated a variety of concerns, including mood disorders, PTSD, anxiety, depression, family conflict, personality disorders, and substance use disorders. Courtney takes a strengths-based approach with her clients, tailoring her methods to their unique needs and empowering them to create a life worth living.

Courtney's passion for this work is driven by a deep commitment to supporting her community and a genuine sense of empathy and compassion for others. Outside of her clinical work, she has been a professional dancer for over 15 years and has taught dance in her community for the past 12. In her free time, she enjoys spending time outdoors, listening to music, seeking new adventures, and being with her friends, family, and loved ones. Traveling is also one of her greatest joys when she's not working or dancing.

Courtney's approach to working with clients is rooted in meeting them where they are, respecting their autonomy, and empowering them to connect with both their past and present selves. She prioritizes building rapport and trust from the very first session, ensuring clear goals and objectives are established early on. Courtney brings a kind, compassionate, and positive attitude to each session, fostering a structured yet upbeat environment where clients feel safe to explore their thoughts and emotions freely.

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Thomas Spina, MD

Staff Psychiatrist

Dr. Thomas Spina is an adult psychiatrist who began his practice at Talkiatry after completing his psychiatry residency at the Eastern Long Island branch of Stony Brook University, where he treated a diverse patient population. Dr. Spina received his undergraduate degree from St. John's University in Queens where he studied Philosophy. Initially interested in a career in law, Dr. Spina decided to change gears and pursue a career in medicine after watching a relative struggle with her diagnosis of Diabetes Mellitus. Dr. Spina then completed medical school at Tel Aviv University in Israel, where he fell in love with psychiatry during his clerkship at Ichilov medical center. During that rotation, he came to appreciate how each patient has his or her own unique story, regardless of their diagnosis. Dr. Spina favors a holistic and integrative approach to psychiatry, combining medication management with supportive therapy, elements of cognitive behavioral therapy, while remaining open to other treatment modalities depending on the needs of his patients. When more focused therapy is indicated, Dr. Spina may recommend that his patient work with a provider specializing in a particular modality of therapy as part of their treatment. Dr. Spina treats adult patients with mood disorders including major depressive disorder and bipolar disorder, anxiety spectrum disorders, OCD, PTSD and specific phobias. In his spare time, Dr. Spina enjoys a variety of hobbies, including Brazilian Jiu-Jitsu, running, baseball, and exploring new eateries and shops.

Talkiatry staff

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Our team of professional healthcare writers work closely with our clinical staff and are trained in scientific research methods. As a medical practice, we adhere to principles of evidence-based medicine and are dedicated to bringing you accurate, accessible, and up-to-date information.

Lauren Treharn, PMHNP

Education and training

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