Hart Kail is the son of actress Michelle Williams and theatre director Thomas Kail. Born in 2020, he is the couple’s first child together. Public interest in Hart comes from his parents’ work in entertainment, rather than any professional activity of his own.
Although his name appears in celebrity coverage, the reliable information about him is limited. This profile brings together confirmed family details, explains his parents’ professional connections and distinguishes their public achievements from their son’s private childhood.
Quick Bio
| Field | Confirmed information |
|---|---|
| Publicly reported name | Hart Kail |
| Birth year | 2020 |
| Mother | Michelle Williams |
| Father | Thomas Kail |
| Known for | Being the son of Michelle Williams and Thomas Kail |
Who Is Hart Kail?
Hart belongs to a family whose work spans television, film and Broadway. His parents were established entertainment professionals before his birth, which explains why announcements about their growing family attracted coverage.
His story can be accurately presented through a small number of documented milestones and the family relationships his parents have publicly acknowledged.
Birth and Early Family Background
Hart Kail was born in 2020, during the COVID-19 pandemic. In May 2022, Williams discussed his arrival in an interview with Variety, which was subsequently covered by Us Weekly. That coverage also identified her son by name.
Williams described the contrast between the uncertainty surrounding the pandemic and her young child’s experience of discovering the world. Her comments provide a direct parental perspective on that period, without revealing detailed information about his everyday life.
His Parents and Their Professional Backgrounds
Michelle Williams: His Mother’s Television Work
Michelle Williams won the 2019 Emmy for Outstanding Lead Actress in a Limited Series or Movie for playing Gwen Verdon in Fosse/Verdon. The Television Academy’s official records confirm both the role and the award.
The production is particularly relevant to Hart’s family background because it also involved Thomas Kail. It provides a documented professional connection between his parents, rather than simply a general link to the entertainment industry.
Williams’ later television work includes Dying for Sex. The Television Academy lists her 2025 nominations as its lead actress and as an executive producer in the Outstanding Limited or Anthology Series category.
Thomas Kail: His Father’s Theatre Career
Thomas Kail won the 2016 Tony Award for directing the musical Hamilton. The official Tony Awards archive confirms his win in the musical directing category.
Kail directed the production, while Lin-Manuel Miranda wrote its book, music and lyrics. For readers researching Hart, his father’s work on Hamilton is a central connection between the family and Broadway.
Michelle Williams and Thomas Kail’s Marriage
Williams and Kail worked together on Fosse/Verdon, which premiered in 2019. Williams portrayed Gwen Verdon, while Kail served as an executive producer and directed several episodes. They married in 2020, the same year Hart was born.
Their occasional joint appearances have also been documented. For example, they attended the 2023 Gotham Awards together.
Siblings and Family Relationships
Hart has an older maternal half-sister, Matilda Ledger, whose parents are Michelle Williams and the late actor Heath Ledger. Williams and Kail also welcomed children in 2022 and 2025.
This means Matilda and Hart share a mother but have different fathers. Thomas Kail is Hart’s father, while Heath Ledger was Matilda’s father.
In August 2025, Williams publicly discussed welcoming her youngest daughter through surrogacy. That disclosure updated the family picture beyond older reports describing her as a mother of two or three.
A Brief Family Timeline
| Year | Documented milestone |
|---|---|
| 2016 | Thomas Kail won the Tony Award for directing Hamilton. |
| 2019 | Fosse/Verdon, featuring Williams and executive produced and partly directed by Kail, premiered; Williams won an Emmy for her performance. |
| 2020 | The couple married and welcomed Hart. |
| 2022 | Williams publicly discussed Hart in coverage of her next pregnancy. |
| 2025 | Williams spoke publicly about the arrival of her youngest daughter. |
What Is Publicly Known About Hart Kail?
Public reporting provides information about Hart’s birth year, parents and siblings. The sources reviewed for this article do not establish his exact birthday, school, personal net worth or future ambitions.
His parents’ financial success does not establish a personal net worth for him. Similarly, their careers do not provide evidence of his interests or future occupation.
Conclusion
Hart Kail is publicly known through his parents, Michelle Williams and Thomas Kail. The strongest available information concerns his birth year, family relationships and the established professional careers of his mother and father.
His parents’ public achievements provide context, while details about his childhood remain limited to information reliably disclosed.
Also Read: John Boyega: His Remarkable Career, Secret Marriage and Baby News
Frequently Asked Questions
Who is Hart Kail?
Hart Kail is the son of actress Michelle Williams and director Thomas Kail. He was born in 2020 and is their first child together.
When was Hart Kail born?
Hart Kail was born in 2020. Williams later discussed becoming a parent again during the pandemic in an interview covered in May 2022. This profile uses the confirmed birth year without assigning an exact birthday.
Who are his parents?
His mother is Michelle Williams, whose performance in Fosse/Verdon earned a 2019 Emmy. His father is Thomas Kail, who received the 2016 Tony Award for directing Hamilton. Both have independently documented careers in entertainment.
Does he have siblings?
Yes. His older maternal half-sister is Matilda Ledger, and his parents welcomed two younger children after his birth. Matilda shares his mother, Michelle Williams, while her father was Heath Ledger.
Is he Heath Ledger’s son?
No. Hart’s father is Thomas Kail. Heath Ledger was the father of Williams’ older daughter, Matilda.
Has he started an acting career?
The reliable sources reviewed do not establish an acting career for Hart. His parents’ involvement in film, television and theatre is not evidence of his own professional participation.
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