Senior Leadership Team

Dr. Ralph de la Torre is the Chairman and CEO of Steward Health Care Systems LLC. Prior to founding Steward, Dr. de la Torre was CEO of Caritas Christi Health Care, where he led the transformation of a six-hospital system and developed the business model for Steward, which was subsequently invested in by Cerberus Capital Management.

Previously, Dr. de la Torre was founder and CEO of the Cardiovascular Institute at Beth Israel Deaconess Medical Center (BIDMC) and of Cardiovascular Management Associates, one of the nation's first totally integrated systems for treating cardiac patients. At the same time, Dr. de la Torre was Chief of Cardiac Surgery at BIDMC and a Harvard Medical Faculty Physician at BIDMC ‒ he was widely recognized as one of the top cardiac surgeons in the nation.

He has founded several health care-related businesses and has numerous issued or pending patents. A frequent commentator on national health care policy issues, Dr. de la Torre has bylined and/or been featured in Businessweek, Fortune, CNBC, The Wall Street Journal, and Fox Business, among other outlets. He was recently voted one of the 25 most powerful physician executives in the United States by Modern Healthcare magazine. Dr. de la Torre graduated from Duke University in 1988 (B.S.E.), where he was a member of Phi Beta Kappa and Tau Beta Pi, and from a joint program between Harvard Medical School (M.D.) and the Massachusetts Institute of Technology (M.S.) in 1992.

As President of Steward Health Care System, Sanjay Shetty, M.D., leads day-to-day operations and strategy for Steward Health Care’s integrated health system in the United States, including 39 hospitals, a large multispecialty medical group, and Steward’s accountable care organization.

Prior to being named to the newly created role of President of Steward Health Care System in March 2021, Dr. Shetty most recently served as President of Steward’s South Region. Throughout his 11-year tenure at Steward, Dr. Shetty has also held the roles of President of Steward Medical Group and President of Steward Health Care Network, as well as Vice President of Radiology, bringing a breadth of knowledge to this role to benefit Steward’s patients, providers and staff.

A graduate of Harvard College (AB, Biochemical Sciences, summa cum laude), Harvard Medical School (MD) and The Wharton School (MBA), Dr. Shetty has held teaching positions at the Harvard Medical School and Tufts University School of Medicine, as well as authored numerous articles, reviews and op-eds as a practicing radiologist actively involved in the state and national level of the American College of Radiology.

Dr. Shetty lives in Dallas with his wife and children and is active in many philanthropic endeavors, including serving as a Trustee of the Phillips Exeter Academy.

Laura Tortorella is the Chief Operating Officer of Steward Health Care System. In this role, she oversees all corporate operations, including labor management, supply chain, pharmacy, lab, predictive analytics and AI platforms, and marketing & communications. Ms. Tortorella has over 15 years in health care business management. Before joining Steward in 2010, she held management positions overseeing the respiratory disease division at Children’s Hospital, Boston. Ms. Tortorella earned a Bachelor of Arts in biology from Harvard College and MBA from Babson College’s F.W. Olin Graduate School of Business

Christopher Dunleavy serves as the Chief Financial Officer of Steward Health Care System. Prior to joining Steward, Mr. Dunleavy was Senior Vice President of Finance and Chief Financial Officer of Brigham Health at Mass General Brigham. At Brigham Health, he oversaw $16 billion in assets across the organization’s 1,000+ bed academic medical center, community hospitals, ambulatory care and urgent care sites. Previous to Brigham, Mr. Dunleavy spent three years at Vizient as Senior Vice President and Chief Financial Officer and prior to that, Executive Vice President and Chief Financial Officer for USMD Holdings, Inc., which includes the USMD Health System serving the Dallas-Fort Worth Metroplex. He also served as Chief Financial Officer for Baylor Heart and Vascular Hospital. Mr. Dunleavy holds an executive MBA from Baylor University and a BBA in Finance from the University of Texas at Arlington.

Dr. Octavio J. Diaz is Chief Medical Officer of Steward Health Care System. In his role, Dr. Diaz is responsible for physician performance, quality outcomes, regulatory oversight, risk management and patient safety at all Steward facilities. Board certified in emergency medicine, Dr. Diaz received his undergraduate degree in Public Health from the University of Massachusetts at Amherst and earned his MD degree from the University of Illinois College of Medicine. He completed a residency in Emergency Medicine at the University of Massachusetts Medical Center and received a Master of Public Health degree from Boston University School of Public Health.

David Colarusso has over 25 years of Healthcare Information Technology (HIT) experience, holding leadership roles for both the HIT vendor industry and large integrated healthcare provider organizations. Mr. Colarusso joined Steward in 2012 and has held numerous leadership roles, most recently serving as Steward’s Deputy Chief Information Officer. He has led Steward’s initiative to standardize the EMR platform, successfully transitioning all Steward’s acute care facilities to one platform in 2020. He has been a leading executive in the acquisitions and on boarding of new hospitals to the Steward system. Prior to joining Steward, Mr. Colarusso spent 17 years on the EMR vendor side implementing, developing and updating hospital software. He has also served as the CIO Forum Co-Chair for the Massachusetts Health Data Consortium. Mr. Colarusso is an industry thought leader who has been keynote speaker at many HIT industry and EMR vendor conferences such as HIMSS, Microsoft, and others. Mr. Colarusso holds a B.S. in Biology from Stonehill College.

Rubén José King-Shaw, Jr., is the Chief Strategy Officer. Mr. King-Shaw previously held the position of Chairman and Chief Executive Officer of Mansa Equity Partners, Inc, and was a member of Steward Health Care System’s board of directors. Throughout his career, he has spent considerable time in public service leading both state and federal government health programs. At the state level, under Florida Governor Jeb Bush, Mr. King-Shaw was the Secretary of the Florida Agency for Health Care Administration. The Agency was responsible for Florida’s State Medicaid Program, Health Quality Assurance, Survey and Certification of healthcare facilities, Managed Care and the Child Health Insurance Program (CHIP).

Mr. King-Shaw also served as Deputy Administrator and Chief Operating Officer of the Centers for Medicare and Medicaid Services (CMS) from 2001 to 2003 during the administration of President George W. Bush. He was also senior advisor to the Secretary of the U.S. Treasury, where he led the Administration's Health Coverage Tax Credit policies to finance coverage for the uninsured. In 2011, Mr. King-Shaw was appointed to the Obama Administration's Program Advisory and Oversight Committee to monitor and provide guidance to Medicare's value-based purchasing program for Durable Medical Equipment. Currently, he is an advisor to the Trump Administration in the areas of fraud, waste and abuse, and alternative payment models.

Dr. Michael Callum is the Executive Vice President for Physician Services for Steward Health Care and immediate past president of Steward Medical Group, a network of physicians employed by Steward that includes both specialists and primary care physicians. Under his leadership, Steward Medical Group has emerged as a national leader in clinical integration, quality performance and patient outcomes-based reimbursement. Dr. Callum is a graduate of the Boston University School of Medicine, where he received his M.A. in medical science and his M.D. He also holds an M.S. in public health from the University of Rochester School of Medicine and Dentistry.

Dr. Joseph Weinstein is Chief Physician Executive, Steward Health Care Network. A fellow of the American College of Physicians and the American College of Cardiology, he has since 1987 been at the forefront of providing high-quality cardiovascular care to patients of Southeastern Massachusetts. Dr. Weinstein is board certified in internal medicine and cardiovascular disease. He completed his residency in internal medicine at Boston City Hospital before a fellowship in cardiovascular disease with Boston University. He graduated summa cum laude from a six-year medical education program at Boston University and the Boston University School of Medicine.

Amy Guay, MPH, FHFMA, ACMPE is President of Steward Medical Group (SMG), overseeing Steward Health Care’s division of primary care physicians and multi-specialty providers. Prior to her role as President, Guay served as SMG’s Chief Financial Officer, offering a wealth of experience having previously served as CFO and SVP at Partners Continuing Care, Inc., in Boston, and as CFO and VP of Finance at Harvard Medical Faculty Physicians at the Beth Israel Deaconess Medical Center. She holds a Master of Public Health from Boston University and earned her Bachelor of Science in Business at Bentley University, in addition to being a Fellow in the Healthcare Financial Management Association.

Roger Mitty, MD, MBA, serves as Chief Physician Executive of Steward Medical Group (SMG) 

– Steward Health Care’s division of primary care physicians and multi-specialty providers. Dr. Mitty is a native of the New York City area who attended Wesleyan University as an undergraduate and then obtained his MD from New York University School of Medicine. After he completed his Residency in Internal Medicine at Mount Sinai Hospital in New York, he trained in Gastroenterology at Boston University. He obtained his MBA from the Isenberg School of Business at the University of Massachusetts. Dr. Mitty has 27 years of clinical experience at Steward’s St. Elizabeth’s Medical Center (SEMC) and has served in numerous leadership roles at SMG, Steward Health Care Network, and SEMC

Patrick Lombardo is the Executive Vice President of Human Resources of Steward Health Care System. In this role, he oversees benefit administration, compensation, labor relations, employee relations, learning and development, and serves as part of the Executive Leadership Team. Mr. Lombardo has more than 25 years in health care senior leadership positions. Prior to joining Steward, he held human resource executive positions at IASIS Health Care and Community Health Systems, which are both located in Nashville, Tennessee, and at Health Management Associates in Naples, Florida. Mr. Lombardo received a bachelor’s degree and master’s degree in human resources and a master’s in counseling from the University of Scranton.

Brian Dunn is the regional president of Steward Health Care’s Western Region comprised of the States of Utah and Arizona, including the affiliated hospitals, surgical centers, urgent care centers, and imaging centers, as well as Steward Medical Group practices and affiliated Steward Health Care Network providers. He has been at the helm of leading health care organizations across Utah for more than 30 years. Brian holds a Bachelor of Arts from the University of Utah and earned his Master of Health Administration from Virginia Commonwealth University/Medical College of Virginia.

Harrison Bane is President of Steward’s North Region, comprised of Massachusetts, Ohio, and Pennsylvania. Previously, Bane was President of St. Elizabeth’s Medical Center and Good Samaritan Medical Center, the two largest hospitals in Steward’s North Region. Earlier in his career, Bane led the system-wide integration of health care delivery and value-based care of 14 skilled nursing facilities, three adult day health centers, and two assisted living facilities for BaneCare. A graduate of Middlebury College, Bane earned his Master’s from the Tuck School of Business and Geisel School of Medicine at Dartmouth

Joe DeSchryver is President of Steward’s South Region, comprised of Texas, Florida, Louisiana, and Arkansas. Joe brings over 20 years of experience operating acute care hospitals and affiliated entities, most recently serving as Chief Executive Officer of the multi-campus Good Samaritan Hospital in San Jose, CA. Previously, he held leadership roles at Sierra Vista Regional Medical Center and West Boca Medical Center, among others. Joe is a graduate of the University of Southern California (BS, Public Policy) and Arizona State University (MBA and MHSA).

With over 20 years of experience in health care around the world, Dr. Armin Ernst brings deep expertise in traditional and innovative delivery systems and extensive managerial experience in building integrated, high-performance systems and teams within large academic medical centers, ambulatory care systems, and for-profit and non-profit health care environments. A Harvard-trained and globally-recognized physician and teacher, Dr. Ernst emphasizes the need for fully integrated high-quality care to achieve best outcomes and create sustainable delivery systems.