Katherine was born and raised in San Diego, California. She obtained her undergraduate education in physiological science at the University of California at Los Angeles, and later went on to complete a master's in public health at the UCLA School of Public Health. She graduated from the David Geffen School of Medicine at UCLA in 2003, and completed residency in emergency medicine at King/Drew Medical Center in 2006.

She currently resides with her six-year-old son in Rancho Palos Verdes. In addition to being a full-time ER physician and mother, she enjoys water sports, multi-media art and has practiced yoga for over 13 years.

Dr. Au Hargraves' practice of Emergency Medicine emphasizes bedside patient education. She focuses on strengthening relationships between patients, their primary physicians and specialists to improve continuity of care, reduce unnecessary ER visits, and thereby encourage appropriate ED usage.

Dr. Kristopher Robert Rinehart was born in Huntington Beach California and grew up in various Orange County beach cities. He attended Saddleback Junior College where he pursued both his academic and athletic interests. Kris earned his undergraduate degree in psychology and biological sciences at the University of California–Irvine, where he graduated cum laude while also winning the martial arts national sparring championship. After working as a research associate at the Institute for Brain Aging and Dementia, he entered medial school in St. Louis, MO. His studies included externships in emergency medicine at Harvard and Loma Linda, where he was offered residency positions. Upon graduation, however, Dr. Rinehart elected to complete his residency training in South Central Los Angeles at Martin Luther King Hospital, a busy county facility with high-volume, high-acuity, level one-trauma facilities and profound medical pathology.

During his residency, Dr. Rinehart served as chief of improved organizational performance and kept a busy moonlighting schedule at both Kaiser and County. He was awarded the Dedicated Service Award and the Charles R Drew Mission Award for his service during residency. Dr. Rineart continued to work for Kaiser per diem after graduating while also working in a number of other ER's in a Locum Tenens capacity. He was then invited to return to Martin Luther King Hospital as an attending physician and associate professor of clinical emergency medicine. During his tenure, Dr. Rinehart served as chairman of the Peer Review Committee and participated in the residency-training program as the director of clinical performance.

Dr. Rinehart left the hospital to organize the partners of California Mobile Physicians (CMP) and begin service to a number of Southern California emergency departments contracted to many different emergency medicine groups. He currently serves as president, CEO and chief medical officer for CMP, while keeping a rigorous clinical schedule.

A native of the Chicago area, Scott first came to California to complete his undergraduate studies at the University of Southern California. He returned after graduating from medical school at the University of Illinois and completed a Residency in Emergency Room Medicine at King/Drew Medical Center in Los Angeles, CA. Scott thrives on the challenges of emergency room medicine and his enthusiasm and work ethic are contagious.