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Board and Leadership

Board of Directors


Senior Leadership Team

Charles “Chuck” Gijanto
President and CEO for Oswego Health

Charles “Chuck” Gijanto joined Oswego Health as President and CEO in September of 2015.

As president of the health system, Gijanto provides strategic, executive and operational guidance for the Oswego Health System, which includes Oswego Hospital, The Manor at Seneca Hill, Springside at Seneca Hill, Oswego Health Home Care, Physician Care, P.C., and other supporting affiliates that provide health services to approximately 120,000 people in the Oswego County region.

Gijanto has 32 years of healthcare leadership experience. He began his career with the U.S. Department of Health, Education and Welfare in New York City. Since then, he has served in a variety of prominent positions providing him with broad-based community hospital experience, a strong emphasis on quality, program development and efficiency, as well as a consistent focus on service excellence, engagement and culture.

He most recently served as the president of Baystate Regional Markets, which is a division of Baystate Health, Springfield, MA. Baystate Regional Markets includes two hospitals and 18 physician practices that provide health services in central Massachusetts. Together, the hospitals and practices combined for an annual budget of approximately $150 million.

Prior to his role as a CEO, Gijanto served in several leadership roles at Champlain Valley Physicians Hospital Medical Center (CVPH) in Plattsburgh, including executive vice president/chief operating officer and chief financial officer. He also served as the chief financial officer at both Fanny Allen Hospital in Colchester, VT and at Moses-Ludington Hospital in Ticonderoga..

While working at CVPH as the vice president of strategic business development, Gijanto earned his master’s degree in Health Systems Administration from the Rochester Institute of Technology. Gijanto previously earned a bachelor’s degree in Business Administration from Siena College.


Allison A.N. Duggan, MD
Executive Vice President and Chief Operating Officer for Oswego Hospital

Since she arrived at Oswego Health in 2001, Allison A.N. Duggan, MD, has enjoyed continued career advancement. Her first leadership position was chief of surgery at Oswego Hospital. Other roles have included president of the Oswego Hospital medical staff and vice president for medical affairs. In January 2014, she began her current position as Oswego Hospital's vice president and chief operating officer.

While fulfilling a leadership position at Oswego Hospital, she continues to provide a wide range of general surgery services, including breast care, on a part-time basis. Dr. Duggan earned her bachelor's degree at New York University and her medical degree from Upstate Medical University. She completed her internship and residency at Howard University and recently completed the Cornell University/Healthcare Association of New York State (HANYS) Academy for Healthcare Leadership Advancement program.

She is a member of the American College of Surgeons, American Medical Association, American Society of Breast Surgeons, Association of Women Surgeons and American Association for Physician Leadership.


Renato Mandanas, MD
Chief Medical Officer

Renato Mandanas, MD, has been with Oswego Health since 1989 and is currently the health system's chief medical officer. He is a long-serving member of the healthcare system's board of directors. Previously, he served in the roles of vice president of medical affairs and chairman of the department of medicine. Dr. Mandanas completed medical school at the University of the Philippines and his residency in internal medicine at SUNY Buffalo, Mercy Hospital. He also fulfilled a Pulmonary Fellowship at Wayne State University, Detroit Medical Center.

At Oswego Health, Dr. Mandanas has been a performance-excellence and quality leader. He has an in-depth knowledge of national trends and has translated broad strategies into specific objectives and goals related to quality. Dr. Mandanas is currently the president of the Medical Society of the State of New York for Oswego County and is a member of the American College of Physicians and of the American College of Chest Physicians.

Along with his Oswego Health duties, Dr. Mandanas also provides care to patients in his private practice, allowing him to keep current on health trends in the community at large.


Jeff Coakley
Vice President for Communications and Government Affairs

Jeff Coakley joined Oswego Hospital in 1997 and has 17 years of progressive management experience in the areas of strategic planning, business development and physician engagement.

Coakley leads the health system's strategic planning, corporate and business development, advertising, media relations, community relations, grant development and governmental affairs functions for the Oswego Health system.

During his tenure, Coakley played an integral role in the organization's growth into a health system. He assisted with the planning, development and actual day-to-day construction activities for many facilities within the system, including the major transformations of the Central Square and Fulton Medical Centers.

Coakley holds a bachelor's degree from Oswego State University and earned his master of business administration from LeMoyne College. He took part in the Cornell University/Healthcare Association of New York State (HANYS) Academy for Healthcare Leadership Advancement program. He is also a member of the Society for Healthcare Strategy and Market Development and has served as president of the local Kiwanis and Chamber of Commerce boards. In 2013, Coakley was named as a Rural Healthcare Worker of the Year. He currently serves as co-chair of the Rural Health Network of Oswego County's Advisory Board and is an Operation Oswego County board member.


Jason Santiago
Chief Operating Officer, The Manor at Seneca Hill

Jason Santiago joined Oswego Health in August 2014. He previously served in leadership positions in nursing home and assisted-living facilities. Santiago previously was the administrator at Camillus Ridge Terrace, an assisted-living facility in Camillus. In this role, he established a quality assurance program, increased occupancy, and established strong relationships with residents and staff. Santiago has also worked at the Auburn Nursing Home, where he earned his administrator's license and was promoted to assistant administrator. In addition to his administrator experience, Santiago has strong financial acumen and held the position of treasury analyst at the Chubb Corporation in Warren, New Jersey. He holds a master of public administration in health services management from Mercy College in Dobbs Ferry and graduated from the Dale Carnegie management and leadership training program.



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