Luna Sanchez Rivera, MD

Dr. Jiang is a board-certified adult psychiatrist. His practice focuses on medication management and supportive therapy. His major goal is for treatment to be patient centered, with a focus on high quality, evidence-based care in the safest and most meaningful way. Dr. Jiang completed an undergraduate degree at the University of California, Los Angeles. He received his medical degree from Oakland University William Beaumont, School of Medicine. He then completed his psychiatry residency at Loyola University Medical Center. Dr. Jiang's areas of interest include depression and post-traumatic stress disorder.‍

Dr. Zac Keller, DO, DABPN (he/his), is a board-certified psychiatrist with experience across inpatient and outpatient settings. He has held leadership roles including Interim Medical Director and Director at Richard Young Hospital, where he also created and led the hospital’s ECT program. Dr. Keller’s clinical focus includes ADHD, PTSD, and personality disorders, and he brings an integrative lens to psychiatric care.

Dr. Keller takes a collaborative, supportive, and evidence-based approach to treatment. He values confidentiality, culturally sensitive care, and trauma-informed practice. Known for his warm yet direct communication style, he works to create a respectful, nonjudgmental environment where patients feel heard, understood, and actively involved in their care.

Care begins with a comprehensive intake that explores medical, psychiatric, social, and functional aspects of a patient’s life. Session length and frequency are tailored to individual needs. Treatment plans are developed collaboratively and may include medication management combined with talk therapy and other evidence-based interventions. Progress is reviewed regularly and adjusted based on ongoing dialogue.

Dr. Rania Elkhatib is a board-certified general psychiatrist with extensive experience in clinical care, teaching, and research. She earned her medical degree from the University of Texas Medical Branch in Galveston and completed her psychiatry residency at UTHealth Science Center in Houston, where she later served as an Assistant Clinical Professor. During that appointment, Dr. Elkhatib was heavily involved in medical education and has developed courses in cultural psychiatry and psychiatry boot camps for medical students.

Dr. Elkhatib specializes in treating a wide range of psychiatric conditions, including Major Depressive Disorder, Anxiety Disorders, Bipolar Disorder, OCD, ADHD, and PTSD. Dr. Elkhatib focuses on evidence-based medication management but will also incorporate supportive therapy and cognitive-behavioral techniques to optimize treatment management and patient’s wellness. She is fluent in Arabic and English and has a strong interest in working with diverse patient populations.

Dr. Elkhatib has a holistic approach with focus on medication management while incorporating supportive therapy and cognitive-behavioral techniques to optimize patient wellness.

Nan Ambrosy is a PMHNP with over 23 years of experience in outpatient and inpatient settings, caring for patients across the lifespan with a wide range of diagnoses. She earned her Doctor of Nursing Practice from Graceland University and holds master’s and post-graduate certificates from Wichita State University. She is ANCC board-certified as both an Adult Psychiatric Clinical Nurse and Lifespan Psychiatric Nurse Practitioner.

Nan uses a patient-centered approach with shared decision-making, fostering strong therapeutic relationships. She focuses on the whole person, emphasizing a balanced lifestyle that includes physical health, sleep, nutrition, exercise, social connections, and spirituality.

She begins with a thorough biopsychosocial assessment and collaborates with patients to set treatment goals. Using clinical judgment and diagnostic criteria, she develops individualized plans, discussing evidence-based treatment options such as therapy and medications. Follow-ups include ongoing monitoring to assess progress and refine goals as needed.

Dr. Seth Flesher is double board-certified in adult psychiatry and addiction medicine.  Dr. Flesher’s practice focuses on medication management of psychiatric illness without the use of controlled substances.  Typically, he offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. However, occasionally Dr. Flesher may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome.

Before joining Talkiatry Dr. Flesher was Medical Director of Advanced Psychiatric Services [complex/high profile cases] at Kings County Hospital and Unit Chief of the Covid19 positive unit.  He was also a clinical professor at Downstate Medical College where he was voted educator of the year numerous times by psychiatric residents and medical students.  Dr. Flesher is a graduate of the prestigious combined 6-year BS/MD program at The Sophie Davis School of Biomedical Education.  He did research at the neuropsychiatric branch of the National Institute of Mental Health, completed his psychiatric residency at St. Lukes/Roosevelt Hospital, and he received his master’s degree in public health from Columbia University.

Dr. Flesher believes that psychiatry should start with a thorough assessment to arrive at an accurate diagnosis.  Then a discussion with the patient of the different evidence-based options available.  Followed by shared decision-making to arrive at an effective treatment plan to achieve the goals that the patient identifies as being important.  This should be done in an honest, open, non-judgmental, but realistic environment.  Understanding that the ultimate goal is to get the patient to a position where they will no longer need medication and/or therapy.

Dr. Barbara Lampert is a board certified psychiatrist, diplomat of The American Board of Addiction Medicine, and Fellow of the American Society of Addiction Medicine. She trained at the Downstate School of Medicine in Brooklyn, NY, completed her internship at Georgetown University in Washington, DC, and her residency in Psychiatry at the David Geffen School of Medicine at UCLA in Los Angeles. Over 30 years, she has worked in inpatient and outpatient settings, taught 3rd-year residents psychopharmacology in the Mood Disorder clinic she created, consulted in the prison system, and volunteered in the aftermath of natural disasters. She joined the New Mexico Medical Reserve Corps and was active in the Corps while working in her private practice. She continued to study the effects of trauma when she returned to California in 2008. She received specialized training in EMDR and Dialectic Behavior Therapy. In addition, she studied substance abuse problems and became a Diplomate of the American Board of Addiction Medicine. Empathy forms the core of Dr. Lampert's approach to treating patients. Working with trauma survivors, she believes that the goal is not to dwell on "the story” because patients often need time to reconstruct an accurate history. Rather, helping patients manage the challenge of living in the present moment is a worthy goal. Dr. Lampert has been named one of the Best Doctors in America for the treatment of mood disorders and one of the Best Doctors in California. She has remained dedicated to the dual path she's followed for years: excellence in Biological Psychiatry and psychology. She looks forward to working with you to help you achieve your treatment goals.