Billy Seidl became a familiar name to reality-TV audiences for a reason that had little to do with baseball statistics. His relationship with Brielle Biermann, the daughter of reality television personality Kim Zolciak-Biermann, pushed the professional baseball player into a much wider spotlight.
That attention naturally led people to search for the basics: How old is Billy Seidl? When was he born? Where is he from? What does he do? And who is the baseball player who became engaged to Brielle Biermann?
The answer to the age question is relatively straightforward once the conflicting information scattered around the internet is separated from documented records. Billy Seidl was born on November 9, 1999, in Newton, Massachusetts. That makes him 26 years old as of October 3, 2026. His 27th birthday will come on November 9, 2026.
But age is only one part of Seidl’s story. Before his name became connected with a reality-TV family, he was building a baseball career through Massachusetts prep baseball, Duke University and the Chicago White Sox organization.
| Detail | Information |
|---|---|
| Full Name | William Randall Seidl |
| Known As | Billy Seidl |
| Date of Birth | November 9, 1999 |
| Age | 26 years old as of October 3, 2026 |
| Birthplace | Newton, Massachusetts, United States |
| Nationality | American |
| Profession | Baseball player / pitcher |
| Height | 6 feet |
| Bats / Throws | Right / Right |
| College | Duke University |
| High School | St. Sebastian’s School |
| MLB Organization | Chicago White Sox organization |
| Draft | 2022, 15th round, 461st overall |
| Minor-League Status | Released by Winston-Salem Dash in March 2025 |
| Public Relationship | Engaged to Brielle Biermann as announced in 2024 |
Billy Seidl Age: How Old Is He in 2026?
Billy Seidl is 26 years old in 2026.
His documented date of birth is November 9, 1999. Because October 3 falls before his November birthday, he has not yet turned 27. He will turn 27 on November 9, 2026.
This is one of those celebrity-search questions where a small date discrepancy can create surprisingly different answers. Articles written during earlier years naturally listed Seidl as 23, 24 or 25. Those numbers weren’t necessarily wrong when they were published; they simply became outdated.
The birth date itself is supported by baseball records rather than depending solely on entertainment websites. Duke University’s official baseball biography identifies him as William Randall Seidl and gives November 9, 1999, as his birth date. Baseball-reference and Minor League Baseball records provide the same date.
That makes the current calculation much more reliable than copying an age from an older celebrity biography.
Why Do Some Websites Give Different Ages?
The confusion largely comes from the way online biographies are maintained.
A page may have been written in 2024, for example, when Seidl was 24. If that page remains online without an updated age field, a reader can encounter an apparently different answer years later.
There has also been at least one notable incorrect birth-date listing online. A celebrity biography page has previously listed September 11, 1999, while the official Duke biography and established baseball databases record November 9, 1999.
For that reason, the most defensible answer is to use the documented November 9, 1999 date rather than whichever age happens to appear in a copied profile.
Who Is Billy Seidl?
Billy Seidl is an American baseball player who developed as a right-handed pitcher.
His full name is William Randall Seidl, although professional baseball records and entertainment coverage generally use Billy Seidl.
Long before his engagement became part of the public conversation, Seidl had a fairly conventional route through American competitive baseball. He attended St. Sebastian’s School in Massachusetts, played both baseball and football, and later joined the Duke Blue Devils baseball program.
At Duke, he developed into a pitcher capable of working both as a starter and out of the bullpen. His college career wasn’t simply a footnote, either. He was part of a Duke program that won the ACC Baseball Championship in 2021, the first ACC tournament title in program history for the Blue Devils.
That athletic background is important because Seidl’s public identity can sometimes be reduced to his relationship with Brielle Biermann. His baseball career existed well before entertainment media began covering the couple.
Early Life and Family Background
Seidl was born and raised in Massachusetts.
Duke’s official player biography identifies his parents as Randall and Janet Seidl and lists three siblings: brothers Tommy and Philip and sister Shannon. His brother Tommy also pursued college baseball, playing at Harvard.
Seidl attended St. Sebastian’s School in Needham, Massachusetts, where baseball was a major part of his athletic development. He also played football and was described by Duke as a scholar-athlete.
His high-school baseball résumé included a particularly strong 2018 season. Duke’s biography notes that Seidl went 7-0 that year, posted a 0.58 ERA across 48.1 innings and recorded 63 strikeouts. He also received Independent School League honors, including MVP and Most Valuable Pitcher recognition.
Those details help explain why he progressed into college baseball rather than arriving at Duke as an unknown prospect.
Billy Seidl at Duke University
Seidl played college baseball for the Duke Blue Devils during the 2021 and 2022 seasons.
His first season at Duke was shortened by the COVID-19 pandemic, so the opportunity to establish himself came primarily during the 2021 campaign.
Duke’s official statistics and biography show that Seidl appeared in 17 games in 2021, including four starts. He finished that season with a 4-0 record and recorded 34 strikeouts in 25 innings.
His strikeout-to-walk ratio was particularly notable. Duke reported a 5.67 ratio, along with a 1.12 WHIP.
More important than individual statistics, though, was the team environment around him. Duke won the ACC tournament in 2021 and entered the NCAA postseason after a 12-game winning streak.
Seidl’s role developed again in 2022. Across his two Duke seasons, he made 34 appearances, including 13 starts, and finished with 89 strikeouts over 68.2 innings according to Baseball-Reference.
His college numbers weren’t perfect. His overall college ERA was 6.55, which shows that his route toward professional baseball involved development rather than a flawless statistical record.
That’s worth remembering when looking back at his career. Professional baseball is full of players who don’t follow a straight line from dominant college numbers to a major-league roster.
The 2022 MLB Draft and Chicago White Sox Opportunity
Seidl was selected by the Chicago White Sox in the 15th round of the 2022 MLB Draft, with the 461st overall selection.
The White Sox subsequently signed him, giving him the opportunity to begin his professional career.
For a pitcher coming out of college, getting into a professional organization is itself a significant milestone. But the draft is not the same thing as reaching Major League Baseball.
Seidl entered the White Sox minor-league system and began working through its development structure.
He made his professional debut in 2022 with the organization’s Arizona Complex League affiliate before moving to the Kannapolis Cannon Ballers.
According to Minor League Baseball records, he finished his professional career with 90 minor-league appearances, 110.2 innings pitched, 113 strikeouts and 16 saves.
Those numbers tell a more complete story than simply saying he was “a baseball player.” He spent multiple seasons attempting to progress through the professional ranks.
His Minor-League Career
Seidl’s professional baseball career covered three seasons from 2022 through 2024.
His first professional season was short but encouraging statistically. Across eight appearances for two minor-league teams in 2022, he posted a 1.00 ERA and struck out eight batters in nine innings.
The 2023 season brought a much larger workload. Pitching for Kannapolis, he appeared in 47 games and threw 53.1 innings. He recorded 53 strikeouts and finished with a 5.06 ERA.
In 2024, Seidl split his time between Kannapolis and the Winston-Salem Dash.
His Kannapolis numbers were considerably stronger: 20 appearances, 24 innings, a 2.63 ERA and 33 strikeouts. After moving to Winston-Salem, he appeared in 15 games and recorded 19 strikeouts over 24.1 innings.
Across the full 2024 season, he finished with a 4.28 ERA in 48.1 innings.
The progression illustrates both sides of minor-league baseball. Seidl was capable of putting together strong stretches, but moving upward through the organization was competitive and difficult.
Did Billy Seidl Ever Play in Major League Baseball?
There is no documented Major League Baseball appearance for Billy Seidl.
His professional playing record is in the minor leagues. The MLB player database identifies his White Sox organizational history and his minor-league statistics, but there is no MLB game record for him.
This distinction matters because online biographies sometimes use the broad phrase “professional baseball player” in ways that readers can interpret as meaning Major League Baseball player.
Seidl was a professional baseball player within the Chicago White Sox organization, but he did not make a major-league appearance.
When Did the White Sox Release Billy Seidl?
The Chicago White Sox organization released Seidl from the Winston-Salem Dash on March 20, 2025.
That transaction effectively marks the end of the publicly documented portion of his White Sox minor-league career.
It also changes the way his current professional status should be described.
Older articles may still identify him as a White Sox minor-league pitcher because they were written while he was with the organization. A current biography should make the distinction clear: he was formerly in the White Sox system and was released in 2025.
There is no need to manufacture a new team affiliation simply because readers want an answer about what he is doing now.
Billy Seidl and Brielle Biermann
For many readers, baseball isn’t actually the reason they know Billy Seidl.
His public profile expanded dramatically after his relationship with Brielle Biermann, the reality television personality known from The Real Housewives of Atlanta and Don’t Be Tardy.
The couple made their relationship public on Instagram in April 2023.
Their relationship attracted attention partly because Biermann had been a recognizable television personality since childhood, while Seidl had remained comparatively private outside baseball circles.
The contrast created a familiar entertainment-media storyline: a professional athlete whose public profile changed after becoming involved with a reality-TV personality.
Still, the couple initially kept much of the relationship relatively private.
Biermann later explained that she hadn’t been sharing everything publicly, suggesting that people close to them already knew about the relationship before it became widely visible online.
When Did Billy Seidl and Brielle Biermann Get Engaged?
Brielle Biermann announced her engagement to Billy Seidl in February 2024.
The proposal took place in Scottsdale, Arizona, and photographs shared by Biermann showed Seidl getting down on one knee.
The engagement was announced publicly on February 26, 2024, shortly after Biermann’s 27th birthday.
The announcement immediately generated coverage from entertainment outlets including People, Us Weekly, Bravo and E!.
Biermann also discussed aspects of the proposal afterward, explaining that Seidl had taken care of the ring process himself and that the proposal was a surprise.
The couple had been dating for roughly a year before the engagement became public.
Are Billy Seidl and Brielle Biermann Married?
Their engagement is well documented, but an important distinction needs to be made when discussing their current status.
As of the reliable reporting used for this profile, the couple had announced their engagement but had not publicly documented a wedding date or marriage in the sources reviewed for this article.
In June 2024, Bravo reported that Biermann was planning for a relatively long engagement rather than rushing immediately into a wedding.
Because private relationships can change without a formal public announcement, it would be inappropriate to turn an older engagement report into an assumption about their status in 2026.
The safest description is therefore that Seidl and Biermann were publicly engaged, with later marital status requiring fresh confirmation from the couple or a reliable publication.
Billy Seidl’s Personal Life Beyond Baseball
Seidl’s public personal life is closely connected to his relationship with Biermann, but relatively little verified information suggests that he has deliberately built a celebrity persona around his private life.
That difference is significant.
Biermann grew up in front of reality-TV cameras, whereas Seidl’s background is rooted primarily in school, college and professional baseball.
The result is a somewhat unusual public profile. People who search for him may expect an entertainment personality, but the underlying biography is that of an athlete who became better known to the general public through a high-profile relationship.
His family has also had connections to competitive athletics, particularly through his brother Tommy’s baseball career at Harvard.
Billy Seidl’s Height and Baseball Profile
Baseball records list Seidl at approximately 6 feet tall and as a right-handed batter and thrower.
His professional role was primarily that of a pitcher, and his minor-league career was largely built around relief appearances.
His statistics show a pitcher who generated strikeouts throughout his college and minor-league career.
Across his 90 minor-league appearances, he recorded 113 strikeouts in 110.2 innings.
That workload also shows how much of his professional career was spent in relief. He made no minor-league starts in the statistical record listed by MLB.
Billy Seidl’s Net Worth: Is There a Confirmed Figure?
There is no reliable public record establishing an exact net worth for Billy Seidl.
That is an important distinction because numerous celebrity and athlete biography sites publish estimated financial figures without explaining how those numbers were calculated.
Seidl’s professional income would have included his compensation as a minor-league player, and Minor League Baseball records also show that he received a $100,000 signing bonus when he signed with the White Sox in 2022, according to The Baseball Cube.
But a signing bonus is not the same thing as net worth.
Taxes, expenses, investments, other income and private financial circumstances all affect an individual’s wealth. Without reliable financial documentation, assigning an exact net-worth figure would be speculation.
For that reason, claims that present a precise net worth for Seidl as an established fact should be treated cautiously.
Why Are People Searching for Billy Seidl’s Age?
The search for “Billy Seidl age” makes sense because his public identity sits at the intersection of two different audiences.
Baseball followers may recognize him through the White Sox organization, Duke baseball and minor-league records.
Entertainment audiences are more likely to know him as Brielle Biermann’s fiancé.
When someone moves from a relatively private professional field into celebrity coverage, basic biographical questions naturally follow. Age is usually one of the first.
There is also a practical reason for the continued search: older articles can show Seidl at 24 or 25, while current readers encounter him several years later.
The birth date solves that problem.
Born November 9, 1999, Seidl is 26 as of October 3, 2026.
Confirmed Facts vs. Uncertain Online Claims
Confirmed
- Billy Seidl’s full name is William Randall Seidl.
- He was born November 9, 1999.
- His birthplace is Newton, Massachusetts.
- He attended St. Sebastian’s School.
- He played baseball at Duke University.
- He was selected by the Chicago White Sox in the 15th round of the 2022 MLB Draft.
- He played in the White Sox minor-league system.
- He was released by Winston-Salem in March 2025.
- He and Brielle Biermann publicly announced their engagement in February 2024.
Reported
Entertainment publications have reported extensively on Seidl’s relationship with Biermann and the couple’s engagement. Those reports are based partly on public social-media posts and statements from Biermann.
Unverified or outdated
Exact net-worth figures, unsupported current employment claims and conflicting birth dates appearing on some biography websites should not be treated as established facts without stronger documentation.
Billy Seidl Career Timeline
| Year | Milestone |
|---|---|
| 1999 | Born November 9 in Newton, Massachusetts |
| 2018 | Recorded a 7-0 high-school season with a 0.58 ERA |
| 2021 | Helped Duke win its first ACC Baseball Championship |
| 2021 | Went 4-0 at Duke and recorded 34 strikeouts |
| 2022 | Selected by Chicago White Sox in the 15th round |
| 2022 | Began professional career in the White Sox minor-league system |
| 2023 | Made 47 appearances for Kannapolis |
| 2024 | Split season between Kannapolis and Winston-Salem |
| Feb. 2024 | Publicly announced engagement to Brielle Biermann |
| Mar. 2025 | Released by Winston-Salem Dash |
| Oct. 2026 | 26 years old |
Interesting Facts About Billy Seidl
1. His full name is William Randall Seidl.
Billy is the name used throughout his public baseball career.
2. He was a two-sport athlete in high school.
At St. Sebastian’s, he played both baseball and football.
3. He was academically accomplished as well as athletic.
Duke’s biography notes that he was a member of the National Honor Society and received academic honors.
4. His brother also played college baseball.
Tommy Seidl played baseball at Harvard.
5. He was part of Duke baseball history.
The 2021 Duke team won the ACC tournament for the first time in program history.
6. He was drafted in the 15th round.
The White Sox selected him 461st overall in the 2022 MLB Draft.
7. He never appeared in an MLB game.
His professional career remained within the minor-league system.
8. His public profile changed after his relationship with Brielle Biermann became known.
Before the relationship attracted entertainment coverage, his public biography was centered primarily on baseball.
What Is Billy Seidl Doing Now?
The most clearly documented professional development is that Seidl was released by the Winston-Salem Dash in March 2025, ending his time in the White Sox organization.
There isn’t enough reliable public information to state that he currently plays for another professional baseball team.
That uncertainty is preferable to repeating outdated pages that continue to describe him as a current White Sox minor-league pitcher.
His public profile also remains connected to Brielle Biermann, although the couple has historically maintained some boundaries around their private life.
Any new professional baseball role, business venture or major public development would need to be confirmed separately rather than inferred from his older biography.
What Makes Billy Seidl’s Story Interesting?
Billy Seidl isn’t a conventional celebrity biography.
His story began in competitive youth and college baseball, moved into professional sports through the White Sox organization and then expanded into entertainment coverage because of his relationship with someone already known to television audiences.
That combination explains why searches for his age, background and career often sit alongside searches about Brielle Biermann.
There’s also a useful lesson in the way his biography has circulated online. A person’s age can look like a simple fact, yet even that basic detail can become unreliable when old articles, copied profiles and conflicting databases remain indexed for years.
In Seidl’s case, the strongest evidence is straightforward: the official Duke biography and established baseball databases give the same November 9, 1999 birth date.
That puts the answer beyond the recycled numbers found in older entertainment coverage.
Frequently Asked Questions
How old is Billy Seidl?
Billy Seidl is 26 years old as of October 3, 2026. He was born on November 9, 1999.
When was Billy Seidl born?
Billy Seidl was born on November 9, 1999, in Newton, Massachusetts.
What is Billy Seidl known for?
Seidl is known primarily as a baseball pitcher who played college baseball at Duke and later entered the Chicago White Sox minor-league system. He also became widely recognized through his relationship with reality-TV personality Brielle Biermann.
Is Billy Seidl a Major League Baseball player?
No. Seidl was part of the Chicago White Sox minor-league organization, but there is no documented Major League Baseball appearance for him.
Which team drafted Billy Seidl?
The Chicago White Sox selected Seidl in the 15th round of the 2022 MLB Draft, 461st overall.
Is Billy Seidl still with the Chicago White Sox?
No. MLB records show that the Winston-Salem Dash released Seidl on March 20, 2025.
Is Billy Seidl engaged to Brielle Biermann?
Brielle Biermann publicly announced her engagement to Seidl in February 2024. Later reporting from Bravo discussed their plans for a longer engagement.
How did Billy Seidl become famous?
His baseball career gave him a professional athletic profile, but his wider entertainment recognition came through his relationship with Brielle Biermann, who is known for her reality-TV appearances.
What is Billy Seidl’s net worth?
There is no reliably documented official net-worth figure for Seidl. Online estimates vary, and precise figures should not be treated as confirmed unless supported by credible financial documentation.
Where did Billy Seidl go to college?
Seidl attended Duke University, where he played baseball for the Blue Devils during the 2021 and 2022 seasons.
Final Thoughts
Billy Seidl’s age is easy to answer once the underlying birth date is established: he is 26 years old as of October 3, 2026, and will turn 27 on November 9.
But the more interesting story is what sits behind that number.
Seidl developed as an athlete in Massachusetts, played football and baseball at St. Sebastian’s, competed for Duke, became part of a championship-winning college program and eventually entered professional baseball after being drafted by the Chicago White Sox. His professional career remained in the minor leagues, ending with his release from the Winston-Salem Dash in 2025.
Then came another kind of public recognition.
His relationship with Brielle Biermann brought him into entertainment coverage and introduced his name to an audience that might never have encountered his baseball career. Their engagement in 2024 made that connection even more visible.
For anyone searching specifically for “Billy Seidl age,” the key fact is therefore clear. The documented birth date is November 9, 1999, not the conflicting date found on some secondary biography pages. From there, the current age follows naturally.
And perhaps that’s the most useful way to understand Seidl’s biography: separate the firmly documented baseball record from the constantly changing world of celebrity coverage, and his story becomes considerably clearer.
[…] The central lesson is simple: information repeated by several websites is not necessarily independently confirmed. Reliable financial reporting requires evidence of ownership, income, liabilities, or a credible financial disclosure. […]