President and CEOMarcel Loh currently serves as the President and CEO of CHA Hollywood Presbyterian Medical Center (CHA HPMC). Loh joins us with more than 40 years of experience in senior leadership roles in healthcare. Prior to joining CHA HPMC, he served as the CEO of Providence Saint John’s Health Center, a research-based community hospital serving the Westside of Los Angeles, and the John Wayne Cancer Institute from 2014 to 2019. During his tenure, he successfully integrated Saint John’s Health Center and John Wayne Cancer Institute into the Providence Health System, established the new service line of neuroscience for the hospital, forged partnerships with leading local hospitals, and implemented Saint John’s Physician Partners, a 200 provider Westside medical foundation. He previously served in executive roles with Providence affiliate Swedish Health Services, a five-hospital, not-for-profit system in Greater Seattle, for 14 years.
Loh earned his master’s degree in hospital administration from the University of Iowa and his bachelor’s degree in business administration from the University of North Dakota. He served as an Army officer in the Medical Service Corps and retired from the Army Reserve as a lieutenant colonel.
In addition to being a past chairman of the Washington State Hospital Association, he also served on the American Hospital Association’s Regional Policy Board for Region 9. Loh is board certified in healthcare management as a Fellow in the American College of Healthcare Executives (ACHE) and served on the ACHE Board of Governors.
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Featuring CHA Hollywood Presbyterian Medical Center President & CEO Marcel Loh
President and CEO
Thomas W. Baumann
Vice President of Strategic Planning and Business DevelopmentTom Baumann is the Vice President of Strategic Planning and Business Development and the Director of Imaging Services at CHA Hollywood Presbyterian Medical Center (CHA HPMC). As part of the executive team, he oversees strategic planning, development of new programs and services, and physician recruitment and retention.
Tom has over 30 years of experience in the healthcare industry spanning various management roles. Most recently, Tom served as the Vice President of Business Development at the Southern California Hospital in Culver City. Previously, he served as the Director of Diagnostic Imaging and Radiation Oncology at the Good Samaritan Hospital, Los Angeles, from 1988 to 1996. He was later promoted as the Director of Business and Physician Development and was instrumental in bringing new programs and services such as Gamma Knife radio surgery, lithotripsy, deep brain stimulation for Parkinson’s disease, Transfusion Free Medicine and Surgery, and expanding international medical referral services to Guam and Micronesia. Tom holds a lifetime teaching credential for the State of California Community Colleges and continues teaching as part of the Pasadena City College Radiology Technology Program since 1986. For 14 years, he developed and taught the ARRT “Advance Placement” year long course for experienced and practicing radiology technologists in preparation for the ARRT examination. He has been invited as a guest speaker on several occasions at CSRT State and Local conferences.
Tom has also donated his time to volunteer and charitable organizations. He has served on the Board of Directors of Culver City Downtown Business Association and as past-president of the Retirement Housing Foundation at Angelus Plaza, Los Angeles. He has received the Presidential Call for Service Award and was nominated for Hospital Association Southern California Employee of the Year Award. Tom helped establish at medical mission service AMNET International which provides ambulance and other critical health care equipment to the people of Guam and Micronesia. He has also served in the US Air Force from 1972-1976 as an EMT paramedic and Radiology Technologist.
Ask him to mix you your favorite cocktail, at times, he moonlights as a professional bartender.
Thomas W. Baumann
Vice President of Strategic Planning and Business Development
Chief Financial OfficerDarryl Linnington is the Chief Financial officer at CHA Hollywood Presbyterian Medical Center (CHA HPMC). With over 25 years of experience as a healthcare financial and information systems professional, Darryl is responsible for overall finance operation at CHA HPMC. He has worked in different parts of the country with providers of all types, including for-profit hospital chains and a physician-owned surgical specialty hospital, and has also worked for healthcare institutions in Canada.
Darryl holds several industry fellowships and certifications. He is a fellow of both the American College of Healthcare Executives (FACHE) and Healthcare Financial Management Association (FHFMA). He is a certified management accountant (CMA), a certified healthcare financial professional (CHFP), and a certified professional in healthcare information management systems (CPHIMS).
Chief Financial Officer
Chief Nursing OfficerNate Mabry MSN, RN, CENP is the Chief Nursing Officer at CHA Hollywood Presbyterian Medical Center (CHA HPMC). Nate has nearly 20 years of experience in the healthcare industry spanning a wide variety of clinical roles and direct leadership oversight of inpatient care units, emergency services, surgical and procedural services and women’s health. At CHA HPMC, he is responsible for the delivery of safe and effective nursing care.
Throughout his career, Nate has held many leadership roles. Most recently, he served as an executive with oversight of Perioperative Services, Women’s Health, and multiple clinical institutes at Providence Saint John’s Health Center.
Nate holds a Bachelor’s degree in Nursing and a Master’s degree in Nursing Leadership and Administration. He recently received his Certification for Executive Nursing Practice (CENP) from the American Organization of Nursing Leadership (AONL).
Chief Nursing Officer
Vice President of QualityJennifer McReynolds serves as the Vice President of Quality at CHA Hollywood Presbyterian Medical Center (CHA HPMC). With over 25 years of nursing experience in quality, Jennifer has extensive knowledge of quality and performance improvement , risk management, patient safety, as well as regulatory requirements and compliance with all governing agencies and accrediting organizations including, California Department of Public Health, Joint Commission, Cal OSHA and the Centers for Medicare and Medicaid Services.
Jennifer is responsible for quality, infection control, risk management and patient relations. She has led hospital-wide efforts to improve the quality of care by implementing a comprehensive initiative built on integrated teams focusing on quality, safety, patient experience and hospital acquired infections. Performance improvement data continue to bear out effective, sustainable changes in culture and management systems.
Most recently, Jennifer served as Chief Clinical Officer at Bakersfield Heart Hospital. Jennifer implemented a Versant Nurse Residency Program, Daily Safety Huddle, and Jennifer’s work on HAI’s led to a decrease in Hospital Acquired Infections. Prior to her role with Bakersfield Heart Hospital Jennifer served as the Director of Quality at Glendale Memorial Hospital where she led system-wide initiatives for quality as well as led the implementation of High Reliability.
Jennifer is a RN and certified with The Healthcare Accreditation C.
Vice President of Quality
Vice President of Human Resources
Irene Ruiz serves as the Vice President of Human Resources at CHA Hollywood Presbyterian Medical Center (CHA HPMC). With over 30 years of HR experience in regulated and unionized environments, Irene is responsible for talent acquisition, succession planning, performance and compensation programs, training and development, change management, labor and employee relations, disability management, licensure and HR compliance as well as benefit administration.
Prior to joining CHA HPMC, Irene served as the Director of Human Resources at Kaiser Permanente, focusing on innovative ways to engage employees, as well as establishing the culture, systems and training to develop leaders.
Irene received her Bachelor of Science in Management, with an emphasis in Human Resources and State of California Self-Insured Certification in Workers Compensation Administration.
Vice President of Human Resources
Rohit Varma, MD, MPH
Chief Medical OfficerRohit Varma, MD, MPH, is the chief medical officer of CHA Hollywood Presbyterian Medical Center, a nationally recognized acute care facility providing compassionate support for Hollywood and its surrounding communities since 1924. He is also the founding director of Southern California Eye Institute (SCEI) located within CHA Hollywood Presbyterian Medical Center.
An accomplished physician-scientist and board-certified ophthalmologist, Dr. Rohit Varma is recognized worldwide as a visionary leader in glaucoma and the epidemiology of eye diseases. He is an expert on changes in the optic nerve in glaucoma and is also studying new imaging techniques in the early diagnosis of glaucomatous optic nerve damage.
Dr. Varma’s primary research focuses on epidemiologic studies of eye disease in children and aging populations. He is principal investigator of several National Institutes of Health-funded studies, including the African American Eye Disease Study, the Chinese American Eye Study, the Los Angeles Latino Eye Study and the Multi-Ethnic Pediatric Eye Diseases Study. His epidemiological studies have significantly impacted health care policy and have allowed for a deeper understanding of how disease affects different populations. Most recently, Varma has been involved in the development of novel implantable intraocular pressure sensors and drainage devices.
Dr. Rohit Varma also served as principal investigator for studies on blindness and vision impairment for the World Health Organization. Further, he is one of the highest National Institutes of Health-funded vision investigators, with continuous funding for more than two decades, demonstrating the importance, relevance and impact of his work.
Dr. Varma has authored or co-authored more than 275 articles in peer-reviewed journals and edited or authored three books. He serves on the Institute of Medicine’s Roundtable on Health Disparities and sat on the Board of the Scientific Counselors of the National Eye Institute.
He is a member of several prestigious academic societies, including the Association for Research in Vision and Ophthalmology, the American Glaucoma Society and the American Academy of Ophthalmology, which has awarded him its Secretariat Award and its Lifetime Achievement Award. He also received the Innovation in Medicine Award from the National Medical Fellowships Foundation and the President’s Award from the Glaucoma Research Foundation.
Prior to founding the SCEI, Dr. Rohit Varma was professor of ophthalmology and preventive medicine and the Grace and Emery Beardsley Chair in Ophthalmology at Keck School of Medicine of USC. Previously he served as dean of the Keck School of Medicine of USC, and president and chair of the Board of Directors of USC Care. He was also chair of the Department of Ophthalmology, and founding director of the USC Gayle and Edward Roski Eye Institute. In addition, he served as associate dean for strategic planning and community network development.
Dr. Varma was professor and chair of the Illinois Eye and Ear Infirmary at the University of Illinois at Chicago where he held the Charles I. Young Endowed Chair of Ocular Research and served as associate dean of strategic planning.
Dr. Varma completed his residency in ophthalmology at the internationally renowned Wilmer Eye Institute at Johns Hopkins School of Medicine, as well as earning a master of public health degree from Johns Hopkins School of Public Health, both located in Baltimore. He completed two glaucoma fellowships, one at the Wills Eye Hospital in Philadelphia and the other at Keck School of Medicine of USC. A native of India, he obtained his medical degree from the University of Delhi.
Rohit Varma, MD, MPH
Chief Medical Officer
Chief Information Officer
Jason Williams is the Chief Information Officer at CHA Hollywood Presbyterian Medical Center (CHA HPMC). He is responsible for stabilization and optimization of our EHR system, along with strengthening IT infrastructure and enhancing patient record systems. He has over 20 years of experience in healthcare and has extensive knowledge of healthcare IT requirements and compliance.
Prior to joining CHA HPMC, Jason served in numerous roles, including regional IT manager at West Anaheim Medical Center, overseeing applications and Infrastructure for four hospitals. Most recently, he served as the IT manager at Olympia Medical Center where he managed the IT department and was responsible for IT procurement, budgeting, and streamlining processes.
Jason holds a Bachelor’s degree in Business Administration Accounting from California State University. He is a certified HIPAA professional and a HIPAA Security Specialist. Jason also holds various training certifications in Meditech (integrated EHR software), Client Server MIS and Client Server PCM, among other technical certifications.
Chief Information Officer