Breadcrumb Home Departments Medicine Pulmonary, Critical Care & Sleep Medicine Our Team Leadership Team Pulmonary, Critical Care & Sleep Medicine Leadership Team Sub-navigation Sub-navigation Our Team Leadership Team Meet Our Executive Leadership Team Steven M. Dubinett, MD Interim Dean, David Geffen School of Medicine at UCLA Associate Vice Chancellor for Research, UCLA Senior Associate Dean Steven M. Dubinett is director of the UCLA Clinical & Translational Science Institute, Associate Vice Chancellor and Senior Associate Dean for Translational Research. He oversees the translation of UCLA biomedical discoveries into medical products and health interventions and is responsible for the efficient integration of the research infrastructure through the CTSI. John A. Belperio, MD Interim Division Chief, Pulmonary, Critical Care, Sleep Medicine, Clinical Immunology & Allergy Professor of Medicine John A. Belperio, MD is the Interim Chief and Professor of Medicine in the Division of Pulmonary, Critical Care, Sleep Medicine, Clinical Immunology and Allergy at The David Geffen School of Medicine at UCLA. Dr. Belperio completed undergraduate at Drexel University in Philadelphia with a B.S. in Chemical Engineering, Medical School at the Temple University and Residency training at The University of Maryland. Tisha S. Wang, MD Clinical Chief, Pulmonary, Critical Care, and Sleep Medicine Program Director, Pulmonary and Critical Care Medicine Fellowship Dr. Tisha Wang is a pulmonologist and critical care physician who practices in Westwood. She treats adult patients with pulmonary complications of liver disease, rare lung disease, sleep disordered breathing, and other pulmonary conditions, including asthma, COPD and pulmonary embolism. She is director of the liver transplant intensive care unit and co-director of the pulmonary embolism response team. Joseph P. Lynch III, MD Associate Chief, Pulmonary, Critical Care, and Sleep Medicine Dr. Joseph P. Lynch III is a pulmonary and critical care physician who practices in Westwood. He is director of UCLA Health’s Advanced Lung Disease and Lung Transplantation Program, and is the Holt and Jo Hickman Endowed Chair in Advanced Lung Disease and Lung Transplantation. His areas of clinical and research interest include lung transplantation, interstitial and parenchymal lung disease, pulmonary fibrosis, sarcoidosis, pulmonary vasculitis, and other rare lung diseases. Our Leadership Team Ravi S. Aysola, MD Section Chief, Pulmonary, Critical Care, and Sleep Medicine Director, UCLA Pulmonary Sleep Medicine Program Dr. Ravi Aysola, MD is a critical care medicine specialist in Santa Monica, CA and has been practicing for 19 years. He graduated from University Of Texas Southwestern Medical Center At Dallas in 2000 and specializes in critical care medicine, pulmonary disease, and more. Rita Kachru, MD Section Chief, Clinical Allergy & Immunology Dr. Rita Kachru is an allergist-immunologist in Santa Monica, California and is affiliated with multiple hospitals in the area, including UCLA Medical Center and UCLA Medical Center-Santa Monica. She received her medical degree from Medical College of Wisconsin and has been in practice for more than 20 years. Dr. Kachru accepts several types of health insurance, listed below. She also speaks multiple languages, including Spanish. Steven Y. Chang, MD, PhD Medical Director, Medical Intensive Care Unit Health Sciences Clinical Professor, Pulmonary, Critical Care, and Sleep Medicine Dr. Chang has expertise in the management of acute respiratory failure requiring mechanical ventilatory support, and in the management of shock. He is currently involved as a co-primary investigator in ARDS trials overseen by the PETAL network and sponsored by the NIH/NHLBI. He has been involved in multiple clinical trials investigating mechanical ventilation, septic shock, and ICU structure & function. Igor Barjaktarevic, MD, PhD Medical Director, COPD Program Health Sciences Assistant Clinical Professor, Pulmonary, Critical Care, and Sleep Medicine As an intensivist in the Division of Pulmonary and Critical Care medicine, I take care of patients admitted to Medical and Liver-transplant Intensive Care Units at Ronald Reagan Medical Center and participate in education of UCLA residents and fellows. Being a Director of of Bedside ultrasound of the Department of Medicine at UCLA, my clinical and research interest is focused on ultrasound-based technologies in intensive care settings and, in particular, fluid responsiveness in shock. David Sayah, MD, PhD Medical Director, Lung Transplant Program Associate Program Director Dr. David Sayah is a pulmonologist in Los Angeles, California and is affiliated with UCLA Medical Center. He received his medical degree from Columbia University College of Physicians & Surgeons and has been in practice between 11-20 years. Rajan Saggar, MD Medical Director, Medical Intensive Care Unit Medical Director Dr. Rajan Saggar is a pulmonologist in Los Angeles, California and is affiliated with multiple hospitals in the area, including Providence St. John's Health Center and UCLA Medical Center. He received his medical degree from Medical College of Wisconsin and has been in practice between 11-20 years. Richard N. Channick, MD Medical Director, Thromboembolic Program Medical Director, Acute and Chronic Thromboembolic Disease Program Dr. Channick is Co-Director of the Pulmonary Vascular Disease Program and Director of the Acute and Chronic Thromboembolic Disease at UCLA Medical Center and is the incoming President of the PERT Consortium. Dr. Channick received his medical degree from Temple University Medical School, where he was elected to the Alpha Omega Alpha Medical Honor Society. Steven Samuel Weigt, MD Medical Director, Interstitial Lung Disease Center Associate Professor in Residence Dr. Sam Weigt is an Assistant Professor in the Division of Pulmonary and Critical Care Medicine. He is also the director of the Interstitial Lung Disease Center and Pulmonary Fibrosis Foundation Care Center at UCLA. He is a graduate of Creighton University School of Medicine, where he earned his M.D. degree. He then did his residency training in Internal Medicine and fellowship in Pulmonary and Critical Care at UCLA. Patricia H. Eshaghian, MD Medical Director, Cystic Fibrosis Program Health Sciences Assistant Clinical Professor Dr. Eshaghian graduated from the Albert Einstein College of Medicine in 2002. Dr. Eshaghian works in Los Angeles, CA and 2 other locations and specializes in Pulmonary Critical Care and Pulmonary Disease. Dr. Eshaghian is affiliated with Ronald Reagan UCLA Medical Center and Santa Monica UCLA Medical Center with 17 years of experience. Michelle R. Zeidler, MD Program Director, Sleep Medicine Fellowship Dr. Michelle Zeidler is a pulmonologist in Los Angeles, California and is affiliated with multiple hospitals in the area, including Cedars-Sinai Medical Center and LAC-Olive View-UCLA Medical Center. She received her medical degree from Keck School of Medicine of USC and has been in practice for more than 20 years. Scott S. Oh, DO Section Chief, Interventional Pulmonology Program Director, Interventional Pulmonology Fellowship Dr. Oh grew up in Southern California and after spending time in Boston returned to Los Angeles. He trained in Internal Medicine at GLAVAHS where he also served as Chief Medical Resident. After completing Pulmonary and Critical Care Fellowship through Cedars-Sinai Medical Center he joined the faculty at UCLA. He obtained further training in Interventional Pulmonology through the Harvard Interventional Pulmonology Program and returned to UCLA as Co-Director of UCLA Interventional Pulmonology. Irawan Susanto, MD Medical Director, Santa Monica Interventional Pulmonology Health Science Clinical Professor Dr. Irawan Susanto is a pulmonologist in Los Angeles, California and is affiliated with multiple hospitals in the area, including UCLA Medical Center and UCLA Medical Center-Santa Monica. He received his medical degree from University of Texas Medical School and has been in practice for more than 20 years. Tao He, MD, PhD Medical Director, San Fernando Valley Interventional Pulmonology Health Science Assistant Clinical Professor Dr. Tao He is a Pulmonary Disease Specialist in Santa Monica, California. He graduated with honors in 2003. Having more than 16 years of diverse experiences, especially in PULMONARY DISEASE, CRITICAL CARE (INTENSIVISTS), INTERNAL MEDICINE, Dr. Tao He affiliates with many hospitals including Santa Monica - Ucla Med Ctr & Orthopaedic Hospital, Ronald Reagan U C L A Medical Center, Los Robles Hospital & Medical Center. Colleen L. Channick, MD Medical Director, Ronald Reagan Interventional Pulmonology Health Science Clinical Professor Dr. Colleen Channick is a nationally recognized interventional pulmonologist who provides both inpatient and outpatient care in Westwood and Santa Monica, and performs diagnostic and therapeutic procedures in both settings. She is board certified in internal medicine, pulmonary medicine and critical care medicine, and is a diplomat of the American Association of Bronchology and Interventional Pulmonology. Catherine L. Oberg, MD Director, South Bay Interventional Pulmonology Health Science Clinical Professor, Pulmonary, Critical Care, and Sleep Medicine Dr. Catherine Oberg is a board-certified interventional pulmonologist who practices in Torrance. She performs a variety of diagnostic and therapeutic respiratory system procedures, and always works with patients to find the least invasive option that aligns with their goals of care. Her clinical interests include minimally invasive diagnostic procedures, bronchoscopic lung volume reduction and central airway obstruction.