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As it celebrates 35 years of impact in Orange County and beyond, OCCF transforms its executive team to meet the dynamic needs of local philanthropists, nonprofits and businesses

IRVINE, Calif. (Jan. 22, 2024) — The Orange County Community Foundation (OCCF), one of the nation’s largest and fastest-growing community foundations, will celebrate its 35th anniversary in 2024, commemorating three and a half decades of amplifying the impact of charitable giving in Orange County, across the country and around the world.

Distinguished among its peers in both growth and impact, the Foundation recently surpassed $1 billion in cumulative granting since its inception, stewards more than $600 million in charitable assets through 640 funds benefiting a wide range of causes, and has led critical initiatives to build a stronger, healthier, more vibrant Orange County for all.

“Ranking in the top 1% in grantmaking and top 7% in asset size among nearly 800 U.S. community foundations, we are on a trajectory of unmatched growth thanks to our exemplary leadership team,” said Shelley Hoss, OCCF’s chief executive officer of 24 years. “As we celebrate 35 years of impact, our new leadership model will be well positioned to amplify OCCF’s impact with the community of philanthropists and nonprofit partners we serve.”

A Foundation for the Future

Orange County’s diverse and growing population of more than 3.1 million residents reflects a thriving community of entrepreneurs, innovators and first-generation wealth creators. In this environment, OCCF has distinguished itself as an expert guide and facilitator for forward-thinking philanthropists aiming for next-level impact. As OCCF prepares for the future, it sees growing opportunities to expand support for the next generations of donors, dreamers and doers through strategic investments in technology, systems, programs and leadership.

To ensure that OCCF continues to build a strong foundation for the future, key leadership roles have been restructured to leverage the unique skills and experiences of each of OCCF’s senior leaders. Effective January 1, 2024, OCCF’s executive team will be organized as follows:

Shelley Hoss

Shelley Hoss will remain the organization’s chief executive officer. She will focus on supporting OCCF’s board, key partners and donors, and community leaders to amplify philanthropic impact in Orange County and beyond.

Tammy Tumbling

Tammy Tumbling, who brought over 20 years of leadership experience when she joined the Foundation as executive vice president and chief operating officer in 2019, has been promoted to president to lead organization-wide operations to ensure that OCCF excels in achieving its strategic vision and goals.

Cathleen Otero

Cathleen Otero, with 10 years of stellar leadership at OCCF, will succeed Tumbling as chief operating officer to continue to elevate OCCF’s donor and community engagement platform and provide leadership to the Foundation’s ongoing innovation and technology transformation.

Tracy Branson

Tracy Branson, OCCF’s chief financial officer of more than 33 years, will remain in her role providing stellar leadership of the Foundation’s finance, accounting, audit and investment functions.

“OCCF is building on our strong history to elevate donor experience and philanthropic innovation and excellence throughout Orange County and beyond,” said Rachid Chamtieh, partner at Deloitte & Touche and chairman of OCCF’s Board of Governors. “We are thrilled to have leaders who are so passionate about the Foundation’s vision and work during such a pivotal time.”

About Orange County Community Foundation
The Orange County Community Foundation (OCCF) combines giving strategy, community intelligence, enduring relationships, and heartfelt intention to amplify the power of giving and its profound result: greater good in Orange County, and beyond. We serve as a resource for individual and family philanthropists, facilitate grant and scholarship programs, and lead community-based initiatives. We inspire giving and connect people and resources to create sustainable impact, granting more than $1 billion since 1989 in Orange County, across the country, and around the world. For more information, visit or call (949) 553-4202. Be a part of our conversation on Facebook, LinkedIn and Instagram. View OCCF’s 2023 annual report here.


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Media Contact
Alexandre Torres
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