Executive Management Team
|Chief Executive Officer
|Chief Operating Officer
|Chief Financial Officer
|Chief Nurse Executive/Chief Clinical Officer
||Barbara A. Vogelsang, RN, MBA, MSN, NEA-BC
|Chief Medical Officer
||Gene Ma, MD, FACEP
|Chief External Affairs Officer
||Aaron Byzak, MBA, FACHE
Steve Dietlin – Chief Executive Officer
Mr. Dietlin joined Tri-City Medical Center as the Chief Financial Officer in February 2013 and was then promoted to Chief Executive Officer in March of 2016. Since his arrival at Tri-City, he has navigated the financial pressures created by federal health care reform as well as those he inherited when he stepped into his role and led the fiscal ’14 financial turnaround. Mr. Dietlin previously served as an executive and a consultant to multiple public, private and not for profit healthcare systems and facilities, and has over 25 years of healthcare financial and operational management experience. As a healthcare executive, Mr. Dietlin has extensive experience leading strategic planning and operations, acquisitions, expansions, affiliations, feasibility studies, turnarounds and community involvement. He began his career as a healthcare audit specialist with Ernst & Young and is a CA Licensed Certified Public Accountant.
Scott Livingstone – Chief Operations Officer
Scott Livingstone is currently the Chief Operations Officer of Tri- City Medical Center. Scott joined the Tri-City Medical Center Team in August, 2010 and has held many leadership roles; from the Director of Case Management to the VP of Hospital Transformation to our Interim Chief Compliance Officer; providing leadership and direction to the Medical Center’s Case Management and population health initiatives, which includes our PRIME Projects. Scott began his career in healthcare in the US Navy as Hospital Corpsman and he completed his nursing education while serving in the Massachusetts Army National Guard. Throughout his nursing career, Scott has worked in many clinical areas – from critical care to trauma and burn unit nursing to case management. And he has held leadership roles in Case Management, Risk Management & Compliance.
Livingstone completed his undergraduate studies at University of Massachusetts, Amherst, graduating with a BSN and is a graduate of Massachusetts School of Law where he earned a Juris Doctorate.
Ray Rivas – Chief Financial Officer
Ray Rivas joined Tri-City Medical Center in 2012 as Senior Director of Revenue Cycle Integrity and in March 2016 assumed the position of Chief Financial Officer (CFO).
Rivas has a finance background that includes over 25 years in the healthcare sector with a proven track record of improving profitability and streamlining processes. During his time at Tri-City, Rivas has successfully led initiatives to improve cash collections and reduce patient registration waiting times. He was also an integral part of the team responsible for securing a $25 million line of credit for the hospital.
Rivas has held CFO roles at Suburban Medical Center in Paramount, Calif., Western Medical Center in Anaheim, Calif., and Chapman Medical Center in Orange, Calif. He has an MBA from Pepperdine University and is registered as a Certified Public Accountant with the State of California.
Barbara A. Vogelsang, RN, MBA, MSN, NEA-BC
Barbara joined the Tri-City Medical Center team in April of 2019 as the Chief Nursing Executive. With over 18 years of experience in Nursing / Hospital Leadership roles, Barbara has been a Registered Nurse for more than 30 years. Prior to assuming this role at TCMC, Ms. Vogelsang served as the Chief Nursing Officer / Chief Operating Officer of Sonoma West Medical Center in Sebastopol, California; Chief Nurse Executive and Clinical Service Director of various clinical areas at Kaiser Permanente San Francisco Medical Center, including Critical Care, Perioperative and Maternal & Child Health.
Born and raised in Louisville, Kentucky, Barbara received her BSN at the University of Louisville. She worked as a Critical Care Nurse and became a Critical Care Clinical Nurse Specialist after completing a Master of Science in Nursing Program at Duke University. In 2001, Barbara began her career in leadership with Providence Health Services in Washington State, moved to California in 2007 and completed a MBA Program at the University of Phoenix in San Jose. She holds a Nurse Executive Advanced Certification from the American Nurses Credentialing Center.
Gene Ma, MD, FACEP – Chief Medical Officer
Dr. Gene Ma has served as an emergency department physician at Tri-City for over 19 years, during which time he was honored as San Diego’s Top Doctor in Emergency Medicine 10 times. Dr. Ma has served numerous administrative roles within Tri-City, culminating in his election as the chief of staff, a role which he held from 2015-2017. He brings with him a wealth of experience in business and practice management, along with demonstrated prowess in adapting to a constantly changing medical field to provide quality care.
Dr. Ma attended medical school at the University of California, San Francisco. He then completed his internship at Stanford, followed by a residency in Emergency Medicine at UC San Diego. He joined Tri-City Emergency Medical Group in July of 2000, subsequently becoming their executive director and managing partner.
Aaron Byzak – Chief External Affairs Officer
Aaron Byzak joined Tri-City Medical Center as the Chief External Affairs Officer in May 2018. In this role, Byzak is responsible for the healthcare district’s marketing, communications, government affairs, and community engagement activities.
For more than two decades, Byzak has served in positions of progressive leadership in Emergency Medical Services, health policy, health care management, and consulting. He has received numerous best practice awards and national recognitions for his leadership and work in health care, public health, advocacy, and communications including four Emmy Awards. Byzak was recognized by the Health Care Communicators of San Diego County with the Communicator of the Year Award in 2017.
Byzak is also founder and chief advocate of Hazel’s Army, a community advocacy and education group that in 2014 helped pass the most comprehensive assisted living reform agenda in California’s history.
He earned his Master of Business Administration in Health Care Management and policy from UC Irvine’s Merage School of Business and a Bachelor’s degree in Social Science from Chapman University. Additionally, Byzak earned certificates in leadership from Cornell University and UCLA’s Anderson School of Management. He is Board Certified in Health Care Management as a Fellow of the American College of Healthcare Executives (FACHE). Byzak resides in Vista with his family.