A private life in public view
I have followed the threads of a life that lives mostly between quiet private spaces and carefully framed public moments. Stacey Siebel is a name that surfaces in philanthropy rosters, in equestrian show programs, and at high profile gatherings. She is, by public record and social presence, the spouse of entrepreneur Thomas M. Siebel. Yet calling her only by that relationship flattens a life that shows itself in charities, stables, and family photographs. I write this to paint a picture stitched from dates, events, and recurring roles rather than to pry into private corners.
Family and personal relationships
Stacey moves through family scenes as both partner and parent. In public view she tends to be the steady figure at local charity events and horse shows, the person standing beside an entrepreneur whose name appears on corporate lists and philanthropic headlines. Family life is central to her public persona. Below is a concise table introducing the family members that appear consistently in public accounts.
| Name | Relationship | Notes |
|---|---|---|
| Stacey Siebel | Subject | Publicly seen at philanthropic and equestrian events; co-named on family foundation |
| Thomas M. Siebel | Spouse | Founder of Siebel Systems and C3.ai; principal family donor and public figure |
| Taylor Siebel | Child | Appears in event photos and social mentions with the family |
| Hunter Siebel | Child | Named in event captions and equestrian coverage |
| Riley Siebel | Child | Public professional profile aligns with family context |
| Fourth child | Child | Public references indicate four children though not all are named consistently |
| Jennifer Siebel Newsom | Extended relation to spouse | A distant family connection to Tom Siebel; a separate Stacey appears in Jennifer’s family history and should not be conflated |
I have chosen to introduce each member by the role they occupy in public life rather than by private detail. That keeps the focus on verifiable presence and avoids speculation. Family photos from charity balls and horse shows often show multiple generations together, a pattern I see repeated over the last decade.
Career, finance, and visible achievements
I must answer cautiously when asked what Stacey does for a living. Her significant public records show no prominent corporate title. Philanthropy and equestrian sport are her main outlets. She and Thomas share the Thomas and Stacey Siebel Foundation name. That foundation publicizes family gifts to education, research, and community projects. The Siebel family banner includes Stacey, but financial headlines normally mention Tom as primary.
Numbers have followed the family recently. In 2024, university news revealed a $50 million Siebel family contribution. Whether personal gifts or foundation funding, the cash establish Stacey as co-patron. She also owns and shows competitive horses. Family horses have participated in regional and national hunter and jumper classes. Show rings are ledgers too: placements, years, and named horses become public accomplishments, not corporate CV.
Recent news and social mentions
I tracked the visible mentions that brought the family into the headlines. A notable date is September 2024, when a high profile political fundraiser took place at the family property in Woodside. Tom and Stacey were listed as hosts, which brought concentrated press attention. In the same stretch of years the family foundation continued to appear in philanthropy reports and university news. Outside of hard news, Stacey shows up frequently in event photography galleries for charity benefit dinners and horse shows in California. Social media mentions are more commonly found through family members and third party photographers than from a personal, high profile account under Stacey’s own name.
Public roles and interests I observe
I perceive three consistent public roles:
- Philanthropic partner – Co-named on the family foundation and present at donor events.
- Equestrian participant – Owner and supporter of show horses and equestrian programs.
- Family anchor – The steady presence in event photos and community gatherings where multiple generations are present.
Those roles are not mutually exclusive. They overlay one another like stitching across a coat: each keeps the whole intact.
Extended timeline of public appearances and events
Below is a timeline composed of public dates and recurring years that I have seen referenced repeatedly.
| Year | Event or Pattern |
|---|---|
| 1996 | Early philanthropic activity and foundation records begin to appear under the family name |
| 2000s | Large university gifts and endowed programs begin appearing in press cycles under the Siebel name |
| 2010 to 2018 | Regular appearances at charity horse shows, benefit galas, and equestrian circuits |
| 2019 | Continued philanthropic engagement, university ties deepen |
| 2023 to 2024 | High profile political hosting and a reported 50 million dollar university gift; continued event presence |
I use years and round numbers because many public reports cluster around these markers. The timeline is intended to show rhythm rather than to imply a complete dossier.
The Thomas and Stacey Siebel Foundation in practice
I write about the foundation as a practical instrument. Foundations give while families govern. The family name on gifts creates programs, endowed chairs, and scholarship activity. Categorically the giving focuses on education, research, and community health initiatives. A gift of fifty million in 2024 is an example of scale; smaller event sponsorships and local grants reveal the same family interest closer to home.
How Stacey appears in the equestrian world
Horses and their names become a separate vocabulary. The family has owned and shown mounts in hunter and jumper rings. Competition results, owner credits, and stable affiliations place Stacey in a circuit that values both aesthetics and performance. I find that equestrian involvement often serves both a personal passion and a public presence: the show ring becomes a stage where goodwill, community, and family intersect.
FAQ
Who is Stacey Siebel?
I see Stacey as a private individual who appears publicly in family, philanthropic, and equestrian contexts. She is married to Thomas M. Siebel and is co-named on the family foundation. She attends and hosts events that place her among donors and community supporters.
Who are the members of her immediate family?
Her immediate family includes spouse Thomas Siebel and four children who appear in public accounts. Named children that recur in event coverage are Taylor, Hunter, and Riley. A fourth child is referenced in several accounts but is not always named in mainstream summaries.
Does Stacey have a public career outside family philanthropy?
Not in the way corporate biographies often list board seats or executive titles. Her public activities center on philanthropy through the family foundation and participation in equestrian sport. Those are visible achievements that do not read like a traditional corporate resume but are public and enduring.
Is she related to Jennifer Siebel Newsom?
There is a separate family link through Tom Siebel that places him as a distant relation to Jennifer Siebel Newsom. It is important to note that Jennifer’s family history also includes a different Stacey in a childhood context. Do not conflate the two Staceys.
Has Stacey been in the news recently?
Yes. Public mentions concentrated around 2023 and 2024 include philanthropic gifts and a September 2024 fundraising event hosted at the family property. Beyond news cycles, Stacey appears regularly in charity event photography and equestrian coverage.
What are the key public dates and numbers associated with Stacey and her family?
Key entries include foundation activity beginning in the 1990s, a cluster of university gifts during the 2000s and 2010s, and a notable 50 million dollar gift reported in 2024. The family hosted a high profile fundraiser in September 2024 and continues to appear at charity and equestrian events annually.
