Serving Humanity to Honor God
We are broadening the definition of health care beyond providing high-quality care when people are sick to address systemic inequities so that more people can reach their full potential for health and life.
SAN ANTONIO, Texas – Methodist Healthcare Ministries of South Texas, Inc. (MHM) announced key additions to its executive leadership team, including the promotion of Oanh Maroney-Omitade to the newly created role of Chief Administrative Officer (CAO), the naming of Sandra Martinez as Vice President of Strategic Partnerships, the appointment of Dr. Tiffany Grant as Vice President of Organizational Excellence, and the appointment of Stewart C. Weaver as Vice President of Information Technology & Services.
All four leaders assumed their roles during the third quarter of 2026, bringing extensive experience in leadership, strategy, operations, technology, organizational development and stakeholder engagement to support MHM's mission of Serving Humanity to Honor God.
"Strong leadership is essential to advancing our mission and ensuring we continue delivering meaningful impact across South Texas," said Jaime Wesolowski, President and CEO of Methodist Healthcare Ministries. "Oanh, Sandra, Tiffany, and Stewart each bring exceptional expertise, vision, and a deep commitment to service. Together, they will help strengthen our organization and position us for continued success as we work to improve the health and well-being of the communities we serve."
Oanh Maroney-Omitade Promoted to Chief Administrative Officer
As Chief Administrative Officer, Maroney-Omitade will oversee Strategic Planning, Organizational Excellence, Communications, and Human Resources, helping drive alignment across key administrative functions while advancing MHM's long-term strategic priorities and organizational culture.
The creation of the CAO role reflects MHM's continued commitment to strengthening the systems, people, and processes that enable the organization to deliver on its mission and maximize impact across South Texas.
Maroney-Omitade is a key architect of MHM's organizational excellence journey. Throughout her 25+ year tenure, she has led efforts to strengthen organizational effectiveness, leadership development, employee engagement, and continuous improvement. Under her leadership, MHM established its Organizational Excellence function, implemented its first organizational culture map and leadership system, expanded leadership development programs, and advanced inclusion and workforce engagement strategies that continue to shape the organization's culture and performance.
She has also played a pivotal role in guiding MHM's pursuit of performance excellence through the Baldrige Excellence Framework. Working closely with leaders and team members across the organization, Maroney-Omitade helped embed a culture of continuous improvement and accountability that has strengthened operations, enhanced decision-making, and improved outcomes for the individuals, families, and communities MHM serves. Her leadership has helped position MHM as a recognized leader in organizational excellence and reinforced its commitment to becoming a role-model organization at both the state and national levels.
Maroney-Omitade earned a bachelor’s degree from Stanford University and master’s degrees from the University of Texas at San Antonio and Texas A&M School of Law. She is a Baldrige Executive Fellow.
Sandra Martinez Named Vice President of Strategic Partnerships
As Vice President of Strategic Partnerships, Sandra Martinez leads efforts to identify, cultivate, and steward strategic relationships that advance MHM's mission and long-term vision for health equity, thriving people, and thriving places.
Martinez previously served as Vice President of Strategy & Partnerships, where she oversaw MHM's Strategy and Impact department, including strategic planning and development, research, and partnerships. In that role, she provided executive leadership for the organization's strategic planning efforts and helped advance initiatives focused on addressing the systemic and root causes of health inequities across South Texas.
With more than 20 years of leadership experience spanning health and human services, public policy, and the nonprofit sector, Martinez has played a key role in strengthening MHM's capacity as a partner, convener, and catalyst for change. She has led efforts to establish strategic partnerships that support cross-sector collaboration and systems-level impact while helping position MHM as a trusted thought leader in the communities it serves.
In her new role, Martinez will oversee the organization's strategic, systems-level partnerships that strengthen collaboration among philanthropic organizations, healthcare institutions, public and private sector partners, faith-based organizations, and civic leaders. She will also provide leadership for key initiatives, regional convenings, and strategic memberships that support MHM's strategic plan and advance collective action around shared community priorities.
Martinez earned a bachelor's degree from the University of Texas at Austin and a master's degree in political science from the University of Texas at San Antonio
Dr. Tiffany Grant Joins as Vice President of Organizational Excellence
Dr. Grant brings more than 20 years of experience advancing organizational effectiveness, leadership development, and strategic growth across education and nonprofit sectors.
In her role as Vice President of Organizational Excellence, she leads efforts focused on strengthening organizational culture and performance, cultivating leadership capacity, and ensuring sustainable impact across the organization.
Known for building high-performing teams and driving transformational change, Grant has served in senior leadership positions in the education and nonprofit sectors at both the local and national levels. She has served as Chief of Staff for San Antonio Independent School District, and Chief of Staff and Interim Chief Operations Officer for Communities in Schools National Office. Her expertise spans organizational development, change management, strategy execution, and cross-functional leadership.
Grant holds a Doctor of Education from Lamar University, a Master of Business Administration from Wayland Baptist University, and a bachelor’s in communications from Texas A&M University. She is a certified career and life coach.
Stewart C. Weaver Named Vice President of Information Technology & Services
As Vice President of Information Technology & Services, Weaver oversees MHM's technology strategy, digital infrastructure, cybersecurity, and technical services.
A seasoned executive with more than 25 years of experience, Weaver has led enterprise transformation, cloud modernization, and technology initiatives across healthcare, government, and global business sectors.
Prior to joining MHM, Weaver served as Managing Partner at AOI Business Consulting, where he led digital transformation and artificial intelligence enablement strategies for healthcare and nonprofit organizations. He also held senior technology leadership positions with the Georgia Department of Public Health and InterContinental Hotels Group.
Weaver holds an Executive MBA from Georgia State University and a Bachelor of Science in Computer Information Systems from DeVry University. He is a certified Project Management Professional and holds multiple credentials in change management, Agile methodology, cloud technologies, and AI leadership.
Wesolowski added that these leadership appointments reflect MHM's continued investment in talent, innovation, and organizational excellence.
"Fulfilling our mission for the people and places we serve begins with empowering and equipping our team members to operate at the highest levels of skill and impact," Wesolowski said. "The addition of Tiffany and Stewart, alongside Oanh's promotion to CAO and Sandra’s appointment to a new role, reflects our commitment to investing in exceptional leadership that strengthens our organization from within. Together, these leaders bring the expertise, innovation and collaborative spirit needed to help Methodist Healthcare Ministries advance health equity and create lasting impact throughout South Texas."
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About Methodist Healthcare Ministries of South Texas, Inc.
Methodist Healthcare Ministries broadens the definition of healthcare by providing low-cost clinical care for the uninsured and by supporting community-led efforts that improve living conditions that cause people to be sick in the first place. We use our earnings as co-owners of Methodist Healthcare to ensure that people who are economically disadvantaged and uninsured can live their healthiest lives. We do this by advocating for, investing in and providing access to quality clinical care and addressing factors that affect health—including economic mobility, supportive relationships, food security, broadband access, and safe neighborhoods. Ultimately, we fulfill our mission of “Serving Humanity to Honor God” by advancing health equity so that more resilient individuals and families living in the 74 counties we serve can thrive.
SAN ANTONIO, Texas – Methodist Healthcare Ministries of South Texas, Inc. (MHM) announced key additions to its executive leadership team, including the promotion of Oanh Maroney-Omitade to the newly created role of Chief Administrative Officer (CAO), the naming of Sandra Martinez as Vice President of Strategic Partnerships, the appointment of Dr. Tiffany Grant as Vice President of Organizational Excellence, and the appointment of Stewart C. Weaver as Vice President of Information Technology & Services.
All four leaders assumed their roles during the third quarter of 2026, bringing extensive experience in leadership, strategy, operations, technology, organizational development and stakeholder engagement to support MHM's mission of Serving Humanity to Honor God.
"Strong leadership is essential to advancing our mission and ensuring we continue delivering meaningful impact across South Texas," said Jaime Wesolowski, President and CEO of Methodist Healthcare Ministries. "Oanh, Sandra, Tiffany, and Stewart each bring exceptional expertise, vision, and a deep commitment to service. Together, they will help strengthen our organization and position us for continued success as we work to improve the health and well-being of the communities we serve."
Oanh Maroney-Omitade Promoted to Chief Administrative Officer
As Chief Administrative Officer, Maroney-Omitade will oversee Strategic Planning, Organizational Excellence, Communications, and Human Resources, helping drive alignment across key administrative functions while advancing MHM's long-term strategic priorities and organizational culture.
The creation of the CAO role reflects MHM's continued commitment to strengthening the systems, people, and processes that enable the organization to deliver on its mission and maximize impact across South Texas.
Maroney-Omitade is a key architect of MHM's organizational excellence journey. Throughout her 25+ year tenure, she has led efforts to strengthen organizational effectiveness, leadership development, employee engagement, and continuous improvement. Under her leadership, MHM established its Organizational Excellence function, implemented its first organizational culture map and leadership system, expanded leadership development programs, and advanced inclusion and workforce engagement strategies that continue to shape the organization's culture and performance.
She has also played a pivotal role in guiding MHM's pursuit of performance excellence through the Baldrige Excellence Framework. Working closely with leaders and team members across the organization, Maroney-Omitade helped embed a culture of continuous improvement and accountability that has strengthened operations, enhanced decision-making, and improved outcomes for the individuals, families, and communities MHM serves. Her leadership has helped position MHM as a recognized leader in organizational excellence and reinforced its commitment to becoming a role-model organization at both the state and national levels.
Maroney-Omitade earned a bachelor’s degree from Stanford University and master’s degrees from the University of Texas at San Antonio and Texas A&M School of Law. She is a Baldrige Executive Fellow.
Sandra Martinez Named Vice President of Strategic Partnerships
As Vice President of Strategic Partnerships, Sandra Martinez leads efforts to identify, cultivate, and steward strategic relationships that advance MHM's mission and long-term vision for health equity, thriving people, and thriving places.
Martinez previously served as Vice President of Strategy & Partnerships, where she oversaw MHM's Strategy and Impact department, including strategic planning and development, research, and partnerships. In that role, she provided executive leadership for the organization's strategic planning efforts and helped advance initiatives focused on addressing the systemic and root causes of health inequities across South Texas.
With more than 20 years of leadership experience spanning health and human services, public policy, and the nonprofit sector, Martinez has played a key role in strengthening MHM's capacity as a partner, convener, and catalyst for change. She has led efforts to establish strategic partnerships that support cross-sector collaboration and systems-level impact while helping position MHM as a trusted thought leader in the communities it serves.
In her new role, Martinez will oversee the organization's strategic, systems-level partnerships that strengthen collaboration among philanthropic organizations, healthcare institutions, public and private sector partners, faith-based organizations, and civic leaders. She will also provide leadership for key initiatives, regional convenings, and strategic memberships that support MHM's strategic plan and advance collective action around shared community priorities.
Martinez earned a bachelor's degree from the University of Texas at Austin and a master's degree in political science from the University of Texas at San Antonio
Dr. Tiffany Grant Joins as Vice President of Organizational Excellence
Dr. Grant brings more than 20 years of experience advancing organizational effectiveness, leadership development, and strategic growth across education and nonprofit sectors.
In her role as Vice President of Organizational Excellence, she leads efforts focused on strengthening organizational culture and performance, cultivating leadership capacity, and ensuring sustainable impact across the organization.
Known for building high-performing teams and driving transformational change, Grant has served in senior leadership positions in the education and nonprofit sectors at both the local and national levels. She has served as Chief of Staff for San Antonio Independent School District, and Chief of Staff and Interim Chief Operations Officer for Communities in Schools National Office. Her expertise spans organizational development, change management, strategy execution, and cross-functional leadership.
Grant holds a Doctor of Education from Lamar University, a Master of Business Administration from Wayland Baptist University, and a bachelor’s in communications from Texas A&M University. She is a certified career and life coach.
Stewart C. Weaver Named Vice President of Information Technology & Services
As Vice President of Information Technology & Services, Weaver oversees MHM's technology strategy, digital infrastructure, cybersecurity, and technical services.
A seasoned executive with more than 25 years of experience, Weaver has led enterprise transformation, cloud modernization, and technology initiatives across healthcare, government, and global business sectors.
Prior to joining MHM, Weaver served as Managing Partner at AOI Business Consulting, where he led digital transformation and artificial intelligence enablement strategies for healthcare and nonprofit organizations. He also held senior technology leadership positions with the Georgia Department of Public Health and InterContinental Hotels Group.
Weaver holds an Executive MBA from Georgia State University and a Bachelor of Science in Computer Information Systems from DeVry University. He is a certified Project Management Professional and holds multiple credentials in change management, Agile methodology, cloud technologies, and AI leadership.
Wesolowski added that these leadership appointments reflect MHM's continued investment in talent, innovation, and organizational excellence.
"Fulfilling our mission for the people and places we serve begins with empowering and equipping our team members to operate at the highest levels of skill and impact," Wesolowski said. "The addition of Tiffany and Stewart, alongside Oanh's promotion to CAO and Sandra’s appointment to a new role, reflects our commitment to investing in exceptional leadership that strengthens our organization from within. Together, these leaders bring the expertise, innovation and collaborative spirit needed to help Methodist Healthcare Ministries advance health equity and create lasting impact throughout South Texas."
# # #
About Methodist Healthcare Ministries of South Texas, Inc.
Methodist Healthcare Ministries broadens the definition of healthcare by providing low-cost clinical care for the uninsured and by supporting community-led efforts that improve living conditions that cause people to be sick in the first place. We use our earnings as co-owners of Methodist Healthcare to ensure that people who are economically disadvantaged and uninsured can live their healthiest lives. We do this by advocating for, investing in and providing access to quality clinical care and addressing factors that affect health—including economic mobility, supportive relationships, food security, broadband access, and safe neighborhoods. Ultimately, we fulfill our mission of “Serving Humanity to Honor God” by advancing health equity so that more resilient individuals and families living in the 74 counties we serve can thrive.
Due to expected inclement weather, all Methodist Healthcare Ministries San Antonio area locations will be closed starting at 3:00 PM on Thursday, October 1, 2026. This includes: Wesley Health & Wellness Center; Dixon Health & Wellness Center; San Antonio Wesley Nurse sites; the Corporate and the Northwest Center Office. Patients with existing appointments for Thursday afternoon will be rescheduled.
Operations outside of the San Antonio area will follow the guidelines of local school districts. Please call your local Methodist Healthcare Ministries contact for guidance on programs and services.
All operations are scheduled to resume on Friday, October 2.
The safety of our patients, clients and team members is of utmost importance.
