John Whittier, MD

Background and credentials

Dr. Jonathan Myrtil is a board-certified adult psychiatrist. He earned his medical degree from Ross University School of Medicine and completed his residency in Adult Psychiatry at the University of Central Florida, affiliated with North Florida Regional Medical Center. After completing his training, he remained at North Florida Regional as an adult psychiatrist and supervising physician, gaining experience treating patients in inpatient, outpatient, partial hospitalization, and intensive outpatient program (IOP) settings.

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Treatment approach

Dr. Myrtil takes a collaborative approach to psychiatric care, integrating medication management with supportive therapy to provide well-rounded treatment. His primary focus is on treating adults with mood and anxiety disorders, PTSD, and ADHD. He prioritizes patient involvement in treatment decisions, ensuring that care plans align with individual needs and goals.

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What you can expect in a first visit

Patients meeting Dr. Myrtil for the first time can expect a thorough evaluation where he assesses their symptoms, treatment history, and personal goals. He fosters a supportive and collaborative environment, working closely with patients to create a personalized treatment plan that incorporates medication management and therapeutic interventions tailored to their specific needs.

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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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Dr. Fatima Ghandour is an adult psychiatrist originally from Southeast Michigan. She earned her undergraduate degree at the University of Michigan and her medical degree at Western Michigan University Homer Stryker MD School of Medicine. She completed her psychiatry residency at Authority Health in Detroit, where she was recognized as Resident of the Year in her graduating class. Dr. Ghandour has experience practicing in both outpatient and inpatient settings and has treated a wide range of conditions including depression, anxiety, ADHD, and PTSD.

Dr. Ghandour values open communication and collaboration, working closely with patients to set clear and meaningful treatment goals. She fosters a warm, supportive environment where patients feel heard, respected, and empowered to take an active role in their care. Her empathetic and patient-centered approach helps individuals feel safe sharing their unique experiences and challenges.

Dr. Ghandour begins each relationship with a thorough evaluation, taking time to understand each patient’s history, concerns, and goals. From there, she develops an individualized treatment plan that reflects the patient’s needs and preferences. She combines evidence-based strategies with ongoing dialogue to ensure treatment remains responsive and aligned with each patient’s progress and well-being.

Daniel Ebert, MD, earned his medical degree from Vanderbilt University School of Medicine and completed his psychiatry residency at Massachusetts General Hospital and McLean Hospital. He has served on the faculty at Harvard Medical School and Johns Hopkins School of Medicine for over 15 years. Board certified in psychiatry by the American College of Psychiatry and Neurology, Dr. Ebert has extensive experience treating mood, anxiety, psychotic, and substance use disorders across inpatient and outpatient settings, including student mental health, community psychiatry, and academic outpatient practices.

Dr. Ebert strives to create a respectful environment where patients feel heard as they build a strong therapeutic alliance. He values long-term collaboration to achieve meaningful treatment goals and improve quality of life. With clinical experience guiding his approach, he offers reasonable therapeutic optimism while addressing challenging symptoms and issues.

Dr. Ebert begins with a comprehensive clinical assessment to understand each patient’s symptoms, life story, behavior, and personality. He develops a collaborative treatment plan, revisiting it over time. Follow-up appointments integrate medication management, if prescribed, and psychotherapy tailored to the individual, using a combination of standard therapeutic approaches aligned with the shared plan.

Dr. Mary O'Malley is board certified in Adult Psychiatry and Sleep Medicine. She received her medical degree from Weill Cornell Medical School and PhD in Neurobiology from The Rockefeller University. She completed her Psychiatry residency and Sleep Medicine Fellowship training at the New York University Medical Center. In her psychiatric practice, Dr. O'Malley uses an integrative approach to health, combining evidence-based concepts in neurobiology with psychological, social and spiritual/existential worldviews to understand and treat every patient. Her primary practice is medication management. She also integrates elements of psychotherapy into her work, typically within 30-minute follow-up visits. In addition to medication and psychotherapy, she incorporates wellness tools into visits, such as mindfulness exercises and sleep management strategies. If she believes that additional psychotherapy is needed, she will recommend that you add a therapist to your care team. Dr. O'Malley has extensive experience working with people from many stages of life, with diverse world views and cultural backgrounds. She has always had an inclusive practice and welcomes people who identify as LBGTQIA+. As part of her own life path she became an Interfaith Minister and enjoys including spirituality and the supportive role it can play in healing for her patients. Her primary focus is working with adults with mood and anxiety disorders, trauma symptoms, ADHD, and problems with sleep. She enjoys working with people facing life transitions, especially older adults and women who are struggling with mental health challenges related to pregnancy and post-partum health. Prior to joining Talkiatry, Dr. O'Malley was working at Hartford Healthcare with adults in intensive outpatient programs and at Hackensack Meridian Health outpatient clinics. She was the medical director of the Consultation Liaison Service at Berkshire Medical Center in Pittsfield, Massachusetts, and an assistant professor at UMass Medical School. She has published and presented widely on topics related to Wellness in Psychiatry, Ethics and Sleep Medicine. She is an advocate for finding your voice in medical decision-making and enjoys using sound healing for relaxation and stress management.

Lisa Mazzotti is a Licensed Professional Counselor in Colorado, and a Licensed Mental Health Counselor and Certified Addiction Professional in Florida. She earned her bachelor’s in Psychology and a master’s in Human Development Counseling from the University of Illinois. With more than 30 years of clinical experience, she has worked with adolescents, adults, and older adults in individual, couple, family, and group settings. Lisa also served as an adjunct professor, teaching psychology and sociology courses for over a decade in high schools, colleges, and correctional facilities. Her extensive background includes treating addictions, trauma, mood and anxiety disorders, OCD, ADHD, self-harm, and eating disorders.

Lisa meets each person where they are, creating a safe space where clients feel heard, valued, and respected. She emphasizes open communication, collaboration, and mutual trust, encouraging patients to share what feels most comfortable and meaningful to them. Lisa’s goal is to empower clients to identify and pursue their personal goals at their own pace, fostering lasting growth. She brings compassion, positivity, experience, and humor to her sessions, reminding patients that change begins with understanding and acceptance.

Lisa tailors her approach by exploring each patient’s history, strengths, and priorities to create an individualized treatment plan. Drawing on Acceptance and Commitment Therapy (ACT), Cognitive Behavioral Therapy (CBT), Dialectical Behavior Therapy (DBT), Rational Emotive Behavior Therapy (REBT), Mindfulness, Motivational Interviewing, and Solution-Focused Therapy, she adapts her methods to meet each client’s needs. Lisa has facilitated Intensive Outpatient (IOP), Partial Hospitalization (PHP), and inpatient group therapy for co-occurring disorders. She supports clients with a broad range of concerns, including anxiety, depression, PTSD, grief, self-harm, abuse, and both physical and psychological addictions.

Dr. Peter Szeibel is board certified in adult psychiatry and has been practicing for over 36 years. His practice has focused primarily on medication management within the context of a supportive psychotherapeutic relationship. He also utilizes cognitive behavioral techniques. If the patient requires more intensive psychotherapy, Dr. Szeibel refers the patient to a therapist and collaborates with the therapist. Dr. Szeibel has experience in treating Depressive Disorders, PTSD, Panic Disorder, OCD, Bipolar Disorder, ADHD, and many other conditions. He feels his personal strengths include his inquisitiveness, scientific curiosity, and his desire to understand his patients better. Dr. Szeibel was born in Hungary, just a few months before the Hungarian Revolution against the Soviets broke out in 1956. He and his family fled under difficult circumstances and immigrated to the United States. Dr. Szeibel grew up in New York City. He attended The Bronx High School of Science, followed by Columbia University for his B.A., where he took a double major in chemistry and music. After obtaining his M.D. from S.U.N.Y in Syracuse, he returned to New York City for residency and fellowship training. During this time he won the Bendheim Fellowship Award at Cohen Children's Medical Center for his research study which examined the effects of background music on the academic performance of children with ADHD. His current areas of interest include adult ADHD, psychiatric and medical co-morbidities, and the LGBTQ population.