Kathleen Ann Trost, RN, BSN - Administrator


Kathy serves as the Administrator of Aspen Surgery Center. With more than 20 years of clinical experience, Kathy’s passion has always been in the Operating Room setting. Kathy’s leadership style focuses on teambuilding and systems implementation to ensure safe patient care. Prior to joining Aspen Surgery Center, Kathy worked for Kaiser Permanente in Walnut Creek for 10 years in various positions including Director of the Emergency Department and Director Perioperative and Interventional Services. Kathy earned her Bachelor of Science in Nursing (BSN) from Regis University in Colorado and her nursing degree from Saddleback College. Kathy’s interests include her love of reading, biking, and shopping. She loves the outdoors and spending time with family and friends in the mountains or on any sunny beach. Kathy also has two German Shepherds who share with her, a love for the outdoors.

Lara Smith, RN, BSN - Director of Nursing


Lara Smith is the Director of Nursing at Aspen Surgery Center and oversees staffing in the preop, recovery, and operating rooms. In addition, she is the Infection Control Coordinator for the facility, assuring appropriate processes and measures are in place to reduce risk of infection. Included in her responsibilities is providing employee vaccinations and tB screening tests annually. Lara received her Bachelor’s degree from Samuel Merritt College of Nursing and is a member of the nursing honor society, Sigma Theta Tau. Her nursing background includes specialization in pediatric critical care and over 20 years in the outpatient surgery environment, mostly in the preoperative and recovery areas. At present, Lara has the best commute to work as she can walk along the canal path from her home in the nearby neighborhood where she lives with her husband and 3 teenage sons. She enjoys spending time scrapbooking and wine tasting.

Rita Rohit, CASC, CPC-H - Director of Business Operations


Rita Rohit has an extensive background in surgery center business office operations with more than ten years of experience in management positions. Rita is currently the Director of Business Operations at Aspen Surgery Center, where she has proudly served in this capacity for more than five years. In her role, she oversees the Business Office, Scheduling, Materials Management and Central Processing. Rita also serves on the Quality Assurance Performance Improvement Team. Before her position at Aspen, Rita worked at Brentwood Surgery Center and Sierra Surgicenter as their Director of Business Operations. And prior to those positions, she worked as Sierra Surgicenter as the Billing Supervisor and Patient Account Coordinator and at Sequoia Surgical Pavilion in various positions such as Business Office Lead and Senior Biller. In her free time, Rita enjoys hiking and traveling to the coastal cities Half Moon Bay, Monterey and Pismo Beach.

Dr. Haywon Lieh - Medical Director


Dr. Haywon Lieh grew up in southern California and attended UCLA where she majored in biochemistry and graduated Summa Cum Laude. Dr. Lieh went to UCSF Medical School, then did Internal Medicine residency at University of Texas, Southwestern in Dallas, Texas. After completing Internal Medicine residency, she returned to the Bay Area for anesthesia residency and cardiac anesthesia fellowship at UCSF. Dr. Lieh is Board-certified in Internal Medicine and Anesthesiology. She joined Medical Anesthesia Consultants in 1994 and has been a fulltime outpatient anesthesiologist for over ten years and Medical Director for over seven years. When not working at Aspen Surgery Center, Dr. Lieh is busy trying to keep up with her 2 sons.