Michael Mosberg: A Journey from the Courtroom to the Forefront of Family Law

When you think of a legal powerhouse, the image of a shrewd, compassionate, and deeply experienced attorney might come to mind. Now, imagine that attorney has not only shaped the landscape of family law but has also done so while navigating the unique complexities of a life that has occasionally brushed against the world of celebrity. This is the story of Michael Mosberg, a founding partner at Mosberg Sharma Stambleck Gross LLP and a national leader in high-net-worth matrimonial law. He has quietly built a reputation as a formidable advocate, representing influential individuals during some of the most challenging moments of their lives. His career is a testament to the idea that true expertise isn’t just about knowing the law, but about understanding the human stories behind each case.

Quick Facts About Michael Mosberg

The Making of a Legal Mind: Education and Early Career

Michael Mosberg’s journey to becoming a titan of the New York legal scene began with a solid foundation in academia. He pursued his undergraduate studies at the prestigious University of Michigan, earning his Bachelor of Arts degree in 1994. This was just the first step in a journey defined by hard work and intellectual rigor. He went on to attend Brooklyn Law School, where he distinguished himself as a Richardson Scholar and a member of the prestigious Moot Court Honor Society. Graduating with his Juris Doctor in 1997, he demonstrated from the very beginning a commitment to excellence in legal practice.

After law school, Mosberg had the opportunity to serve as a law clerk to the Honorable Virginia M. Morgan of the United States District Court for the Eastern District of Michigan. This clerkship provided him with an invaluable behind-the-scenes view of the judicial process, shaping his understanding of how courtroom decisions are made. In 1998, he was admitted to the New York State Bar, officially beginning his career in the city that would become his professional home for decades to come.

Legal Career and Professional Expertise

Rising Through the Ranks

Michael Mosberg is not just a lawyer; he is a leader among his peers. He is a founding partner of Mosberg Sharma Stambleck Gross LLP (MSSG), a boutique firm designed to skillfully guide high-net-worth individuals through the complexities of family and matrimonial law. His practice involves handling some of the most significant divorce cases in the nation, representing successful professionals and their families. While he “strives to arrive at private and amicable resolution whenever possible,” his expertise also shines in the courtroom, where he is “equally as comfortable” litigating complex financial disputes and sensitive custody issues.

His peers have consistently recognized this mastery. He has been listed in The Best Lawyers in America since 2014, and in a testament to his standing, was named the “Lawyer of the Year” for Family Law in New York City in 2026. He has also been selected as a New York Super Lawyer consistently from 2013 to 2025, having previously been named a “Rising Star” in 2011 and 2012—an honor reserved for only 2.5% of attorneys nationwide.

Leadership in the Legal Community

What truly sets Michael Mosberg apart is his dedication to advancing the field of family law beyond his own practice. He is a former Chair of the American Bar Association (ABA) Family Law Section, one of the most influential roles a family lawyer can hold, where he worked to make “matrimonial law a diverse and inclusive area of practice”. He is a Fellow of both the American Academy of Matrimonial Lawyers and the International Academy of Family Lawyers, selective organizations that recognize the top practitioners in the field.

Additionally, Mosberg has served as Chair of the Matrimonial Law Committee for the New York City Bar Association and has been a member of the influential New York State Matrimonial Practice Advisory and Rules Committee for seven years. This involvement means he doesn’t just follow the rules of family law—he helps write them.

An Author and Educator

Beyond the courtroom, Mosberg is a prolific contributor to legal scholarship. He is a frequent lecturer on topics involving family law and trial practice at prestigious events across the country. He has authored critical works for fellow practitioners, including Avoiding Deposition Pitfalls and Depositions Gone Wrong: The Seven Deadly Sins, as well as a chapter on prenuptial agreements for the renowned legal treatise Drafting Prenuptial Agreements. His ability to distill complex legal concepts into clear, actionable advice makes him a sought-after mentor in the legal community.

The Man Behind the Lawyer: Personal Life and Values

While Michael Mosberg has built a formidable legal career, his personal life has also been a subject of public interest. In 2009, he married Jemima Kirke, an artist and actress best known for her role in the HBO series Girls. The couple met during a meaningful time in both their lives; as Kirke later revealed, they first connected at a rehabilitation center where Mosberg was working on a project, a meeting that solidified their bond.

Together, they had two children: a daughter named Rafaella Israel and a son named Memphis. Mosberg also has two older children, Elijah and Lea, from a previous relationship, making him a dedicated father of four. The couple lived in Brooklyn, where they incorporated aspects of their Jewish cultural and religious background into their family life. Their marriage ultimately ended in divorce around 2016-2017, a transition they managed with a focus on co-parenting and family well-being.

Net Worth and Financial Overview

Given his stature as a high-net-worth family law attorney, it is estimated that Michael Mosberg has accumulated substantial wealth throughout his career. While early 2021 estimates placed his net worth at approximately $400,000, it is highly likely that figure has grown significantly, as it predates his recognition as “Lawyer of the Year”. The complex nature of the cases he handles—often involving the division of massive financial portfolios—pays well, reflecting the immense responsibility and skill required to protect his clients’ interests.

Social Media and Public Engagement

Unlike many professionals in the public eye, Michael Mosberg has chosen to keep his personal life relatively private. He is not a public figure on mainstream social media platforms like Instagram or Twitter, preferring to focus on his work and his family. He lets his professional reputation speak for itself, a decision that aligns with his reputation as a dignified and serious legal practitioner.

Recent Updates and Future Goals

Michael Mosberg continues to lead Mosberg Sharma Stambleck Gross LLP with a focus on excellence. In 2024, the entire firm was recognized as Lawdragon 500 Leading Family Lawyers, a collective honor that underscores the firm’s dominance in the field. He continues to be a thought leader, frequently contributing to publications like the New York Law Journal. His future goals appear to be rooted in continuing this legacy of leadership and mentorship, building a legacy that extends far beyond individual cases.

Conclusion

As Michael Mosberg continues to pave the way for future generations of family law attorneys, his story stands as a reminder of how resilience and purpose can shape a meaningful legacy. He has demonstrated that true success comes not just from winning cases, but from advocating for the legal system’s evolution and supporting clients through their most vulnerable moments. His journey from a law clerk to the head of the American Bar Association’s Family Law Section proves that integrity, hard work, and a genuine commitment to helping others can build a career that resonates far beyond the courtroom.

Read this to: Brenda Warner: A Story of Unshakable Faith, Resilience, and Redefining Success

Frequently Asked Questions (FAQs)

1. Who is Michael Mosberg?

Michael Mosberg is a prominent, high-net-worth family law attorney and founding partner at Mosberg Sharma Stambleck Gross LLP in New York City. He is a national leader in matrimonial law and was formerly married to actress Jemima Kirke.

2. What is Michael Mosberg’s legal specialty?

He specializes in representing high-net-worth individuals in all areas of family and matrimonial law, including divorce, child custody, support, and prenuptial agreements. He is known for his work in both private mediation and high-stakes courtroom litigation.

3. What are some of his notable professional achievements?

His notable achievements include being named “Lawyer of the Year” for Family Law in New York City by Best Lawyers (2026), serving as Chair of the American Bar Association Family Law Section, and being a Fellow of both the American Academy and International Academy of Matrimonial Lawyers.

4. How did Michael Mosberg meet Jemima Kirke?

They first met in a rehabilitation center in Brooklyn where Mosberg was involved in opening a recovery center. This meeting occurred during Kirke’s second stint at a rehab facility.

5. Does Michael Mosberg have children?

Yes, he has four children: Rafaella Israel and Memphis with his ex-wife Jemima Kirke, and Elijah and Lea from a previous relationship.

6. Where does Michael Mosberg practice law?

He practices law in New York, New York, at the firm Mosberg Sharma Stambleck Gross LLP, which is located on the Avenue of the Americas in Midtown Manhattan.