GREENWICH — All 24 attorneys and staff from Ivey, Barnum & O’Mara (IBO) LLC, one of Greenwich’s oldest law firms have joined Roseland, New Jersey-based Mandelbaum Barrett PC effective Jan. 1, 2026, according to a release from Mandelbaum.
The addition of IBO’s attorneys expands Mandelbaum Barrett’s geographic reach into New England and provides expanded resources to the Connecticut firm’s clients. Further, it strengthens both firms’ capabilities across several practice areas, including real estate, trusts and estates, franchise law, litigation, and personal injury.
“This strategic expansion of Mandelbaum Barrett PC into Connecticut and the subsequent growth of our practice now allow us to serve both corporate and individual clients in the region with even greater depth, agility, and personalized service,” said William S. Barrett, CEO of Mandelbaum Barrett PC.
Some of the attorneys from IBO, established in 1950, have also served their communities in leadership roles, ranging from the U.S. Congress and the U.S. Senate to serving as probate judge and president of the Connecticut Bar Association.
“Our firm was built in Greenwich, and our roots here in Fairfield County run deep,” said Ivey, Barnum & O’Mara Partner and Management Committee Member Stephen G. Walko. “This partnership represents an opportunity not only to expand our capabilities and resources for our growing client base here, but also to preserve everything that has defined our practice locally.”
The partnership with IBO gives Mandelbaum Barrett gives the nearly 100-year-old law firm its largest contingent of attorneys.
“The addition of these attorneys to Mandelbaum Barrett marks a significant milestone in our firm’s strategic and steady growth from a small practice founded in 1930 with just one attorney to now 150 attorneys beginning in 2026,” Chair Barry Mandelbaum said. “It is certainly an exciting way to start our 96th year and testimony to both the firm’s impact and the culture we have built over the years.”
Mandelbaum’s father, Irving Mandelbaum, founded the firm in Newark, New Jersey.
