Sexton was born in
New Bedford, Massachusetts. In 2001, less than one year after his admission to the
New York State Bar, Sexton opened Law Offices of James J. Sexton, PC where he has remained Managing Partner for over two decades. He published his first book on marriage and divorce in 2018, originally titled ''If You're in My Office, It's Already Too Late
in the United States. An updated edition was published in the United Kingdom as How Not to F*** Up Your Marriage: Straight Talk from a Divorce Lawyer Who's Seen It All''. Sexton has appeared on podcasts such as
Lex Fridman,
Soft White Underbelly,
Modern Wisdom,
The Diary of a CEO, and
The Huberman Lab. He had a recurring segment "How To Stay In Love" on the
Steve Harvey Show from 2019 to 2021. In 2025, he launched TrustedPrenup.com with the aim of making prenuptial agreements accessible to a wider public, after years of working on contracts for wealthy clients. As of 2025, Sexton has practiced as a divorce lawyer in New York for 25 years. He is known for representing wealthy clients, including tech executives, celebrities, and athletes. He has represented clients in more than 1,000 cases involving marital disputes. ==Personal life==