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Our Senior Team

Our senior team brings hundreds of years of experience to the Greater Waterbury Health Network.

Darlene Stromstad, FACHE


President & CEO, Greater Waterbury Health Network and Waterbury Hospital

Darlene Stromstad, FACHE, has been President & CEO of the Greater Waterbury Health Network (GWHN) and Waterbury Hospital since July 2011. For the past five years she has successfully led the organization’s efforts to navigate the rapidly changing waters of healthcare reform. Her relentless pursuit of excellence and focus on cultural transformation is evident by improvements in quality indicators of care, enhanced patient satisfaction, and recognition of Waterbury Hospital by US News & World Report, Consumer Reports, and Healthgrades, among other organizations. In 2015, Waterbury Hospital was recognized as a high performing, “regional best” hospital by U.S. News & World Report for both knee and hip replacements and named one of the top hospitals in Connecticut.   In 2014, Waterbury Hospital was the only Connecticut hospital to receive the Distinguished Hospital Award for Clinical Excellence from Healthgrades, placing it among the top 5 percent of hospitals nationwide in clinical outcomes.

Before joining GWHN and Waterbury Hospital, Stromstad was President and CEO of Goodall Hospital, Sanford, ME. She also served as Senior Vice President of Catholic Medical Center, Manchester, NH.

Stromstad is actively engaged in national, state, and local organizations. She is a Fellow of the American College of Healthcare Executives, and has served as ACHE Regent for Maine, a member of the national Board of Governors of ACHE, and now serves on the ACHE Ethics Committee. She is also a member of the board of the Connecticut Association Health Care Executives.

At the state level, she is a board member of the Connecticut Hospital Association. Locally, Stromstad is a member of the board of directors for the Waterbury Regional Chamber of Commerce and the Greater Waterbury United Way. She also serves on the Naugatuck Community College Advisory Council.


A native of North Dakota, Stromstad received her BA from the University of North Dakota, and her MBA from Rivier College in Nashua, NH.

Dr. David J. Pizzuto, M.D.

Dr. David Pizzuto

Vice President of Medical Affairs/CMO

Dr. Pizzuto became vice president of medical affairs and chief medical officer in June 2011. A graduate of the Waterbury Hospital Internal Medicine Residency Program (1987), he has been a member of the Attending Medical Staff since January 1988. In addition to his administrative duties, Dr. Pizzuto also continues to practice internal medicine full time. Additionally, Dr. Pizzuto has held various leadership roles at Waterbury Hospital including Chairman of the Department of Medicine (1997-2007), Chief of Staff (2008-2010), and a member of the Board of Trustees (2011 – present).

Dr. Pizzuto holds and M.D. from New York Medical College (1984), a Master of Science from the University of Minnesota (1980), and a Bachelor of Science Degree from the University of Connecticut (1977). He is certified by the American Board of Internal Medicine (1996 and 2006 – recertified).

Mark Holtz, MS, FACHE

Mark Holtz, Waterbury Hospital, March 2015.

Senior Vice President and Chief Operating Officer of the Greater Waterbury Health Network

In this role, Mark’s current responsibilities are in patient care services, contracted services, hospital outpatient services, laboratory, pharmacy, Alliance Medical group, and the Cardiology Service line including the Cardiology Associates of Greater Waterbury. Mark’s prior positions include, SVP/COO of Glens Falls Hospital in NY, COO of Overlook Medical Center which is part of the Atlantic Health System, and SVP of Operations for Lehigh Valley Health Network. Mark received his Bachelor of Arts in Psychology from Herbert H. Lehman College of the City University of New York in 1979, and Master of Science in Healthcare Systems Management from Iona College in New Rochelle NY in 1984. Mark is also a Fellow of the American College of Healthcare Executives and an Eagle Scout, Boy Scouts of America.

Guy DiStefano, MBA, CPA

Guy DiStefano

Guy DiStefano is the Chief Financial Officer . Guy has a wealth of experience in acute and behavioral hospital finance and operations in both not-for-profit and for-profit healthcare organizations.  Previous positions include Chief Financial Officer for Bluffton Regional Medical Center in Indiana; Chief Financial Officer at Hampton Behavioral Health Systems in Westhampton, New Jersey; Chief Financial Officer of CFG Health Systems in Marlton, New Jersey; and other executive level financial positions at the Children’s Hospital of Philadelphia, the Joseph J. Peters Institute in Philadelphia, and Cooper Health System.  
Guy holds a Master’s Degree in Business Administration from Rowan University and a Bachelor’s Degree in Accounting from Rutgers University.


Sandra Iadarola, RN, MBA, BSN, CPHQ

Sandy Ladarola

Sandra Iadarola is the Chief Nursing Officer and Vice President of Patient Care Services at Waterbury Hospital. Sandi has been the Chief Nursing Officer at Waterbury Hospital since 2011. A Waterbury native, Sandi started her career as a nurse at Waterbury Hospital. She has worked as a nurse leader in different hospitals in Connecticut for more than 30 years. Sandi served as Administrative Director of Medical/Surgical and Critical Care Services at Waterbury Hospital for eight years prior to her current role. Before that, she served as Vice President of Patient Care at Charlotte Hungerford Hospital in Torrington.

Sandi holds a Bachelor’s of Science in Nursing from University of Connecticut and a Master of Business Administration from Rensselaer Polytechnic Institute. She is a Certified Professional in Healthcare Quality by the National Association of Healthcare Quality.

Richard P. Kropp

Vice-President of Human Resources at Waterbury Hospital/Greater Waterbury Network

Richard has more than 30 years of experience in human resources including as Vice President of Human Resources for Lourdes Health System in Camden, New Jersey, as Senior Vice President for Human Resources for Caritas Christi Health Care in Boston, Massachusetts and as Vice President for Human Resources for Cape Cod Healthcare.

Richard has a Master’s Degree in Human Resources from Penn State University, and a Doctoral Degree in Humanistic Psychology from Boston University. He is the co-author of several books on human resources including: Human Resources Planning and Development in Healthcare and Performance Management and Collaborative Leadership and Communicating in the Business Environment.

Michael Cemeno

Michael Cemeno

Vice President and Chief Information Officer at Waterbury Hospital and the Greater Waterbury Health Network

Michael's responsibilities include Information technology, telecommunication, facilities and clinical engineering. Under Michael’s leadership Waterbury Hospital was named Most Wired Hospital, four years in a row, in an annual survey conducted by Hospital & Health Networks Magazine, the flagship magazine of the American Hospital Association. Waterbury Hospital is fully compliant with Meaningful Use 2 Stage 2 Criteria under the HITECH Act since September 2015. In addition, Waterbury Hospital is among less than 25 percent of hospitals in the country that have reached Level 6 in Electronic Health Records adoption with criteria in place for the final Level 7.

Prior to joining Waterbury Hospital in 2011, Cemeno served as an Associate Chief Information Officer for Yale New Haven Health Systems for nearly eight years. Cemeno served as Vice President and Chief Information Officer for Greater Hudson Valley Health System prior to that.

Cemeno holds a Bachelor of Business Administration degree from the Fox School of Business and Management at Temple University.