Mandelbaum Barrett PC has announced that all 24 attorneys and staff from Ivey, Barnum & O’Mara LLC (IBO), one of Greenwich, Connecticut’s oldest and most respected law firms, have joined Roseland-based Mandelbaum Barrett PC, effective Jan. 1, 2026.
The addition of IBO’s attorneys extends Mandelbaum Barrett PC’s geographic reach into New England and provides expanded resources to the Connecticut firm’s clients. It also 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. “But, just as important, the attorneys and staff of Ivey, Barnum & O’Mara who have joined Mandelbaum Barrett bring a shared legacy of excellence, community leadership, and client-first values to our firm.”
Ivey, Barnum & O’Mara, established in 1950, is the largest law firm based in Greenwich and is known for its expertise in real estate, trusts and estate planning, business, employment, litigation and personal injury law. Many of the attorneys from IBO who have joined Mandelbaum Barrett PC 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.
Fairfield County is home to many of the world’s leading financial and professional services firms, and most recently, a growing information services sector. It also ranks among the wealthiest counties in the United States.
“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,” Chairman Barry R. 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, founded the firm in Newark.
