Our Physicians

Dr. Culjat earned his B.S. at University of California San Diego and his M.D. at Chicago Medical School. He completed his Residency and his Pulmonary, Critical Care and Sleep Fellowship at USC Medical Center in 2007. Dr. Culjat is Board Certified in Internal, Pulmonary, Critical Care Medicine and Sleep Medicine. Dr. Culjat is fluent in Spanish and has moderate fluency in Croatian and Czech languages.

Dr. Caleb Hsieh is a pulmonary, critical care and sleep medicine physician who practices in Torrance. He sees patients with a wide range of conditions, from asthma and COPD to sleep apnea and insomnia. He works to explain and translate evidence-based medicine to patients in a way that empowers them to make informed decisions. He is triple board-certified in internal medicine, pulmonary medicine, and critical care, and is board-eligible for 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.