Peter Truong, MD

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.

Jan Hollis-Cole, LCSW, began her career as a social worker for hospice in 1999 and has extensive experience helping families cope with death and grief due to illness and/or trauma. Following her foundational work with hospice care, Jan expanded her clinical knowledge and expertise in a variety of settings to include substance abuse, challenges related to ADHD, anxiety, depression, LGBTQIA+ issues, and navigating the foster care/adoption system.

Jan believes that connection is the foundation of positive growth and dedicates her work to providing a safe place for clients to engage in self-expression and to explore the particular challenges they face on a daily basis.

Her approach is client centered, focusing on evidenced based therapies such as Cognitive Behavioral Therapy (CBT), Dialectical Behavorial Therapy (DBT) and Eye Movement Desensitization Reprocessing (EMDR). Jan works with clients of all ages and encourages inclusion and diversity within families to promote individual growth.

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Dominika is a Licensed Clinical Social Worker (LCSW) who has been in the field for ~20 years performing individual, group, and family service. During her education, Dominika focused on various forms of treatment modalities including DBT, ACT, CBT, trauma informed, family systems, motivational interviewing, and substance abuse treatment. Dominika has been an active remote, mental health therapist for the past several years, and has experience with working with diverse populations providing services to adults and children in mixed settings.

Dominika has an extensive background working with survivors of trauma, depression/bipolar disorder, anxiety, ADD/ADHD, grief, PTSD, schizophrenia and other forms of psychosis, gender/sexual identity difficulties, eating disorders, substance abuse, domestic violence, life transitions, as well as combinations of multiple problems. Dominika is a firm believer meeting people at their own pace to accomplish their objectives at their own speed.

Dominika’s initial appointment is an assessment, gathering the client’s background information and reason for seeking treatment, focusing on the client's own specific goals/desires for therapy and helping ct envision what this would look like for them in order to establish a general roadmap on moving towards their aspirations. After the first session, Dominika concentrates on what complications exist to ct’s objectives and how ct can utilize supportive tools/resources to help overcome these barriers. Dominika then helps cts establish weekly, smaller goals that can lead cts to their larger scale aspirations.

Deora Johnson, PMHNP, is a board-certified adult psychiatric nurse practitioner with 24 years of experience. He is passionate about providing clients with a holistic approach to mental health care, incorporating both pharmacologic and non-pharmacologic interventions. Deora works with adult and senior populations, focusing on the assessment, diagnosis, and treatment of mental health conditions. He collaborates closely with clients to guide them through understanding and selecting the most effective interventions and medication management options for their needs. Supportive therapy, solution-focused therapy, and motivational interviewing are integral components of his medication management sessions.

Deora earned his Master of Science in Nursing from Vanderbilt University in Nashville, Tennessee, and completed a nursing practice degree at the University of Alabama in Birmingham. He has experience treating patients in a variety of outpatient and inpatient settings.

His areas of specialty include the treatment of major depressive disorder, anxiety disorders, bipolar disorder, ADHD, PTSD, and insomnia. His research focused on non-pharmacologic interventions for insomnia in individuals with depression.

Deora also has experience working with military veterans. At the VA Outpatient Clinic in Baltimore, Maryland, he treated veterans returning from Operation Iraqi Freedom and Operation Enduring Freedom, as well as those from the Vietnam and Korean War eras. His clinical work focused on PTSD, major depressive disorder, anxiety disorders, and bipolar disorder.

Deora believes the therapeutic relationship offers a unique opportunity to work collaboratively through life’s challenges. He views medication management as an important part of a comprehensive treatment plan that also includes therapy.

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Background and credentials

Dr. Matthew Koller is a board-certified adult psychiatrist who completed his undergraduate training at The University of Texas at Austin. He earned his medical degree from The University of Texas Health Science Center at San Antonio and completed his general adult psychiatry residency at Baylor College of Medicine in Houston, TX, where he served as Chief Resident of Education in his final year of training.

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Treatment approach

Dr. Koller believes that understanding a patient fully is essential before treatment begins, emphasizing a collaborative and patient-centered approach to care. His practice is primarily focused on medication management, but he also incorporates supportive therapy and other therapeutic modalities as needed. He may recommend including a therapist in the treatment plan to ensure comprehensive, well-rounded care. He has experience treating a wide range of mental health conditions, including depression, anxiety, insomnia, personality disorders, bipolar disorder, PTSD, and psychotic disorders.

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What you can expect in a first visit

During the first visit, patients can expect a thorough and individualized psychiatric evaluation, where Dr. Koller takes the time to understand their symptoms, history, and treatment goals. He prioritizes open communication and shared decision-making, working closely with patients to develop personalized treatment plans. While medication management is the foundation of his approach, he remains flexible and adaptive, incorporating therapy and other interventions as needed to help patients achieve optimal mental health.

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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. Silverberg is a licensed counselor in Arizona, California, and Washington, and has been licensed since 2008.  Dr. Silverberg has extensive experience working in the mental health field with varied client demographics, helping clients with varied conditions including a Federally Qualified Health Center.

Historically, Dr. Silverberg attended the University of Delaware, majoring in psychology and minoring in cognitive science.  After a master’s degree from the University of Phoenix, he went on to complete a Doctor of Behavioral Health degree from Arizona State University in 2011.

Dr. Silverberg has an eclectic approach to mental health issues including pieces of ACT, CBT, DBT and Motivational Interviewing.  He believes in the mind-body connection and that both affect each other.