Akif Khawaja, MD

Dr. Kira Posteraro is double board-certified in Adult and Addiction Psychiatry and has over 10 years of clinical experience. She completed her General Adult Psychiatry Residency at Allegheny General Hospital in Pittsburgh, PA, followed by a fellowship in Addiction Psychiatry at Beth Israel Medical Center in New York, NY.

Dr. Posteraro’s career has included serving as Director of Psychiatric Services at an addiction treatment center in Pittsburgh, PA, where she provided care across the full continuum of substance use disorder treatment—including residential, acute PHP, IOP, outpatient, and aftercare services. She later held the role of Section Chief Psychiatrist for the Center for Treatment of Addictive Disorders at VA Pittsburgh Healthcare System, offering both residential and outpatient services and acting as Medical Director for the SAMHSA-certified Opioid Treatment Program. Most recently, she served as Chief of Psychiatry for the Behavioral Health Service Line at VA Pittsburgh, where she had the honor of caring for our nation’s Veterans.

While her clinical expertise centers on the diagnosis and treatment of substance use disorders, Dr. Posteraro also has extensive experience treating a wide range of psychiatric conditions, including depressive and bipolar spectrum disorders, anxiety disorders, and trauma-related disorders.

Dr. Posteraro uses a collaborative, supportive approach to care, incorporating motivational interviewing to help guide patients on their journey to wellness. She integrates holistic strategies alongside medication management and is dedicated to meeting patients where they are in treatment to build individualized, effective recovery plans.

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Dr. Leslie Davis became a psychotherapist because she believes that mental health shapes and influences various aspects of life. Mental health is considered vital! She has been a Doctor of Social Work since 2021 and a Licensed Clinical Social Worker since 2019, with experience supporting children, adolescents, young adults, and adults with concerns such as trauma, substance abuse, intimate partner violence, depression, anxiety, PTSD, mood disorders, marital issues, and more. She has extensive experience in various settings including inpatient, outpatient, partial hospitalization (PHP), intensive outpatient (IOP), school settings, community-based settings, and emergency departments.‍Dr. Leslie Davis does not see her role as a therapist as needing to "save the world” or "empower” clients. Instead, she believes in working alongside clients to help them identify tools within themselves and community resources to successfully achieve their goals. The types of therapy offered include, but are not limited to, Cognitive-Behavioral Therapy (CBT), Culturally Sensitive Therapy, Dialectical Behavior Therapy (DBT), Motivational Interviewing, Multicultural Therapy, Person-Centered Therapy, and Solution-Focused Therapy. Alongside the use of evidenced-based practices and culturally informed care, Dr. Leslie Davis has developed a proven approach for helping clients (a) identify the root cause of their challenges and (b) create a tailored plan that leads to measurable progress.

Serena Mirchandani is a board-certified psychiatric nurse practitioner with extensive experience treating serious mental illnesses such as bipolar disorder and schizophrenia spectrum disorders. She also provides care for individuals with depression, anxiety, PTSD, OCD, autism spectrum disorder, and substance use disorders. Serena earned both a Master of Science in Nursing and a Doctorate in Nursing Practice in psychiatry from Columbia University. She completed a Nurse Practitioner Fellowship at Community Healthcare Network and worked at Bellevue Hospital for 2.5 years, providing care on an inpatient psychiatric unit for a diverse, underserved population.

Serena’s approach is grounded in open communication, evidence-based care, and deep respect for each patient’s lived experience. She prioritizes a collaborative, safe space where individuals feel heard, respected, and empowered. Her holistic style supports honest conversation, transparency in treatment options, and patient-centered goals.

Serena begins with a comprehensive assessment to understand each patient's full story—biological, psychological, and social. She then partners with patients to develop personalized, evidence-based treatment plans that align with their values and goals. She emphasizes education, transparency, and regular follow-up to support ongoing progress and informed decision-making.

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.

Ernest Smith, LPC, specializes in supporting adolescents, young adults, adults, and older adults as they navigate grief, anxiety, depression, trauma, and life transitions. With a compassionate and client-centered approach, he creates a safe, nonjudgmental space for individuals to explore their experiences and build the skills necessary for healing, growth, and resilience.

Ernest draws from a range of evidence-based modalities—including solution-focused therapy, person-centered therapy, cognitive-behavioral therapy (CBT), and dialectical behavior therapy (DBT). He tailors each session to meet the unique needs of his clients, whether helping adolescents manage emotional regulation and identity development or supporting older adults in coping with grief and life changes.

Ernest provides trauma-informed care and recovery-focused strategies that foster emotional safety, self-awareness, and long-term well-being. His goal is to walk alongside each person with empathy, understanding, and practical tools that promote lasting change and inner strength.

Dr. Dominique Holley is a triple board-certified psychiatrist in Adult Psychiatry, Child and Adolescent Psychiatry, and Addiction Medicine. Dr. Holley completed her post-doctoral residency and fellowship training at Walter Reed National Military Medical Center. She has served as an active US Army officer and recently separated from the US Army after 11 years of service. In her most recent role, she served as the Deputy Chief of the Department of Behavioral Health at Fort Campbell, KY where she provided clinical and administrative supervision, as well as mentorship and guidance for an interdisciplinary team of over 140 personnel. She maintained oversight of behavioral health care being delivered through 11 clinics and satellite locations, providing patient care for over 30,000 beneficiaries. While in leadership, she continued to provide direct patient care for service members and dependents including child and adolescent populations. Due to her experience with this unique population, she has extensive experience in treating individuals with trauma. She offers an holistic approach when caring for individuals dealing with mental illness as well as phase of life circumstances. She believes in treating the whole person and attending to physical, spiritual, and mental health. Dr. Holley provides supportive, cognitive behavioral, acceptance and commitment, and psychodynamic therapy skills that complement medication management in order to help improve wellness.