Most people first heard the name Michael Mosberg when tabloids announced his split from Girls actress Jemima Kirke. But behind the headlines is a lawyer who built a national reputation long before his marriage made him entertainment news fodder.
If you’re here, you probably want the full picture. Not just the celebrity angle, but who Michael Mosberg actually is — his legal career, his background, his family, and what happened to his marriage. This article delivers exactly that, with verified details from his law firm biography, court records, and public interviews.
Whether you’re researching Michael Mosberg out of curiosity about Jemima Kirke’s ex-husband or you’re evaluating his credentials as a family law attorney, this guide covers it all.
Michael Mosberg is a nationally recognized family law attorney and founding partner of Mosberg Sharma Stambleck Gross LLP (MSSG) in New York City. He was married to actress Jemima Kirke from 2009 to 2017, and the couple shares two children: daughter Rafaella Israel Mosberg and son Memphis Kirke Mosberg.
Who Is Michael Mosberg? Early Life & Background
Michael A. Mosberg was born around 1977, making him approximately 48–49 years old as of 2025. His exact birthdate isn’t publicly listed, but records confirm he graduated from the University of Michigan in 1994 and Brooklyn Law School in 1997.
Before entering private practice, Mosberg served as a law clerk to the Honorable Virginia M. Morgan of the United States District Court for the Eastern District of Michigan. This federal clerkship gave him early exposure to high-stakes litigation — experience that would shape his entire career.
His Orthodox Jewish background has also been noted publicly. In a 2014 New York Magazine feature, Jemima Kirke described him as “super-Jew and super-corporate,” adding that he went to a Yeshiva law school. She said she was drawn to the contradiction: his religious traditionalism paired with his polished corporate presence.
Key facts at a glance:
- Born: ~1977 (age ~48–49)
- Undergraduate: University of Michigan, B.A. (1994)
- Law School: Brooklyn Law School, J.D. (1997)
- Federal clerkship: Eastern District of Michigan
- Admitted to practice: New York and Connecticut
Michael Mosberg’s Legal Career: From Clerk to National Leader
Michael Mosberg didn’t stumble into family law. He deliberately built a reputation as one of the most respected divorce attorneys for high net worth individuals in the United States.
Founding Partner at MSSG
In 2022, Mosberg helped launch Mosberg Sharma Stambleck Gross LLP, a boutique matrimonial and family law firm based at 1270 Avenue of the Americas in Manhattan. As a founding partner, he handles some of the most significant divorce cases in the country — frequently involving complex financial disputes, custody battles, and public figures who need discretion.
National Leadership Roles
Mosberg’s peers have repeatedly elected him to lead family law organizations at both the state and national level:
- Past Chair (2020), American Bar Association Family Law Section
- Former Chair (2011–2014), Matrimonial Law Committee, New York City Bar Association
- Fellow, American Academy of Matrimonial Lawyers
- Fellow, International Academy of Family Lawyers
- Member, New York State Matrimonial Practice Advisory and Rules Committee
Awards & Recognition
His legal work has earned consistent industry recognition:
| Award / Recognition | Years |
| The Best Lawyers in America(Family Law) | 2015–2024 |
| Super LawyersNew York (Top Rated Family Law) | 2011–2023 |
| Chambers and Partners— High Net Worth Family/Matrimonial | 2022–2023 |
| Lawdragon500 Leading Family Lawyers | 2024 |
| ABA Family Law Section Chair’s Cup Award | 2014, 2020 |
Publications & Thought Leadership
Mosberg is also a published author in his field. His works include:
- Avoiding Deposition Pitfalls
- Depositions Gone Wrong: The Seven Deadly Sins
- The Secret To Success: Using Witness Consultants to Prepare Your Client
- Contributed to New York Civil Practice: Matrimonial Actions
- Authored a chapter on prenuptial agreements for Drafting Prenuptial Agreements
He lectures regularly for the ABA, state bar associations, and legal education institutes across the country.
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Michael Mosberg & Jemima Kirke: Marriage, Divorce & What Really Happened
Michael Mosberg and Jemima Kirke married in 2009 in what Kirke later described in surprisingly blunt terms. In a 2017 tweet from E! News, Kirke called their wedding “pointless, not fun, and out of necessity.”
Despite that characterization, the marriage lasted seven years and produced two children.
How They Met
Kirke has said publicly that she was attracted to Mosberg because of the contrast between his traditional Jewish upbringing and his corporate legal career. In the 2014 Jewish Journal profile, she explained: “We do Shabbat sometimes. Mike went to Yeshiva law school. He’s super-Jew and super-corporate. That’s why I was so attracted to him when I met him: the contradiction.”
The Separation
News of their split broke in January 2017, though sources said they had actually separated in the summer of 2016 — six months before the public announcement. The divorce was finalized that same year. Neither party filed publicly contested proceedings, and the split appeared to remain private outside of media coverage.
Why They Split
In a 2017 interview with People, Kirke offered a candid explanation: acting had changed her. “I’ve started to figure out what I really want,” she said, implying that her growing career and personal evolution had created distance between them. The divorce came as Girls was reaching peak cultural saturation, and Kirke’s visibility as an actress had expanded dramatically since their 2009 wedding.
Michael Mosberg Children: Rafaella Israel & Memphis Kirke Mosberg
Michael Mosberg and Jemima Kirke have two children together:
- Rafaella Israel Mosberg — born October 2010 (age ~14–15)
- Memphis Kirke Mosberg — born November 20, 2012 (age ~12–13)
Both children were born during the marriage and were young when their parents divorced. Despite the split, Mosberg and Kirke have generally kept their children’s lives out of the media spotlight.
Rafaella’s full name — Rafaella Israel Mosberg — reflects both her mother’s artistic sensibility and her father’s Jewish heritage. The name “Israel” carries particular significance given Mosberg’s Orthodox background.
Post-divorce, Kirke has spoken occasionally about co-parenting and the challenges of raising children while working in entertainment. Mosberg, for his part, has maintained his privacy and focused on his legal practice.
What Does Michael Mosberg Do Now? Current Career & Net Worth
As of 2025, Michael Mosberg remains a founding partner at MSSG in New York City, where he continues representing high-net-worth clients in divorce, custody, and matrimonial law matters. His practice focuses on cases that require both financial sophistication and public-relations discretion — a specialty that has made him a go-to attorney for wealthy individuals navigating high-profile splits.
Michael Mosberg’s Job & Daily Work
A typical week for Mosberg involves:
- Client consultations for new divorce and prenuptial matters
- Settlement negotiations aimed at private resolution
- Courtroom litigation when settlement isn’t achievable
- Lecturing and publishing on family law developments
- Advisory work with the New York State Matrimonial Practice Advisory Committee
Michael Mosberg Net Worth
No verified public figure exists for Michael Mosberg’s net worth. However, his client base, firm leadership, and decades of practice at the highest level of matrimonial law suggest substantial professional success. Partners at elite New York family law boutiques typically earn well into the seven figures annually.
For context: Chambers and Partners and Best Lawyers recognition is reserved for attorneys handling the most complex and lucrative cases in their jurisdictions. His consistent inclusion across multiple peer-reviewed directories signals a thriving, high-value practice.
Michael Mosberg vs. Other Celebrity Divorce Attorneys
How does Mosberg stack up against other well-known family lawyers? Here’s a quick comparison:
| Factor | Michael Mosberg | Typical Celebrity Divorce Attorney |
| Client Base | High net worth individuals, executives | Celebrities, athletes, executives |
| Firm Type | Boutique matrimonial specialist | Large firm or solo practice |
| National Recognition | ABA Section Chair, Chambers-ranked | Varies; often regional |
| Public Profile | Low (avoids media) | Often high (frequently quoted) |
| Academic Output | Multiple books and articles | Minimal to moderate |
| Geographic Focus | New York / Connecticut | Often California or New York |
The takeaway: Mosberg distinguishes himself through institutional leadership rather than media presence. While many celebrity attorneys build brands through television commentary, Mosberg built his through peer elections, published scholarship, and bar association leadership.
Michael Mosberg on Reddit, Wikipedia & Online Presence
If you’re searching for a Michael Mosberg Wikipedia page or extensive Michael Mosberg wiki content, you’ll find the digital footprint is surprisingly thin for someone with his professional stature.
- Wikipedia: There is no dedicated Wikipedia article for Michael Mosberg as of 2025. He is mentioned in Jemima Kirke’s Wikipedia entry.
- Reddit: Michael Mosberg Reddit discussions are sparse and typically appear in Girls TV show threads or celebrity gossip subreddits. No verified AMA or substantial conversation exists.
- LinkedIn: He maintains a professional LinkedIn profile listing his role as founding partner at MSSG.
- IMDb: He has an IMDb page, but only because he appeared briefly in Girls (2012) and was married to a cast member.
This low profile is intentional. Family attorneys representing wealthy, private clients generally avoid publicity — and Mosberg’s minimal online presence aligns with that professional norm.
FAQ: Everything People Ask About Michael Mosberg
Who is Michael Mosberg?
Michael Mosberg is a nationally recognized family law attorney and founding partner of MSSG in New York City. He is best known publicly as the ex-husband of Girls actress Jemima Kirke.
What kind of lawyer is Michael Mosberg?
He is a family law attorney specializing in high-net-worth divorce, custody disputes, and matrimonial litigation. He represents wealthy individuals in complex financial and custody cases.
How old is Michael Mosberg?
Michael Mosberg is approximately 48–49 years old as of 2025. He was born around 1977 and graduated from the University of Michigan in 1994.
When did Michael Mosberg and Jemima Kirke get married?
They married in 2009 and divorced in 2017 after seven years of marriage.
How many children does Michael Mosberg have?
He has two children with Jemima Kirke: daughter Rafaella Israel Mosberg and son Memphis Kirke Mosberg.
What is Michael Mosberg’s net worth?
His exact net worth is not publicly disclosed. However, as a founding partner at an elite New York matrimonial boutique with decades of high-value practice, he is presumed to be financially successful.
Is Michael Mosberg Orthodox Jewish?
Yes, Mosberg has an Orthodox Jewish background. Jemima Kirke has publicly described him as “super-Jew,” noted his Yeshiva education, and mentioned that they observed Shabbat together during their marriage.
Where did Michael Mosberg go to law school?
He earned his J.D. from Brooklyn Law School in 1997. He also holds a B.A. from the University of Michigan (1994) and completed a federal clerkship before entering private practice.
Conclusion
Michael Mosberg is far more than a celebrity ex-husband. He’s a national leader in family law, a published author, a former ABA section chair, and the founding partner of a respected New York matrimonial boutique. His seven-year marriage to Jemima Kirke may have brought his name to popular attention, but his professional credentials stand entirely on their own.
If you found this guide helpful, share it with anyone researching Michael Mosberg lawyer details, the Jemima Kirke Michael Mosberg marriage story, or high-profile family law representation in New York. Have a question we didn’t answer? Drop it in the comments below.
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