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New Boston Teamsters president takes office as former president elected to lead whole union

As former president Sean O’Brien takes the union’s top spot, former secretary elected to lead Local 25

New Teamsters Local 25 President and Principal Officer Thomas Mari, center, stands with the local's Vice President Joan Corey, left, and its secretary-treasurer Steven South. Mari was appointed to the top spot as former local President Sean O'Brien moves to lead the international union. (Courtesy Teamsters Local 25)
Courtesy / Teamsters Local 25
New Teamsters Local 25 President and Principal Officer Thomas Mari, center, stands with the local’s Vice President Joan Corey, left, and its secretary-treasurer Steven South. Mari was appointed to the top spot as former local President Sean O’Brien moves to lead the international union. (Courtesy Teamsters Local 25)
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The former secretary-treasurer of Boston’s Teamsters Local 25 is stepping up into the top role as its former president is leaving to become the union’s international president.

“I am both honored and thrilled to be able to serve the hardworking members of Teamsters Local 25,” Thomas Mari said in a statement.

The Teamsters union represents roughly 1.4 million workers in nearly 1,900 affiliates in a wide variety of industries throughout the U.S., Canada and Puerto Rico, according to its homepage.

Mari, a 30-year, third-generation member of the union and an elected official within it since 2006, will lead the largest Teamsters union in New England at more than 12,500 members, according to a statement. He was appointed as president and principal officer of the local on Saturday following Sean O’Brien’s resignation.

O’Brien, the president of the local since 2006, was elected general-president for the Teamsters and will take office on March 22.

“Leading the international union will be a challenging task. We have many trials and challenges ahead of us,” O’Brien said in a Friday video released by the local. “We have the ability, because of our militant rank-and-file members, to do great things for working class families.”

O’Brien was the youngest president in the local’s history, according to a statement.

“As president, I’m looking forward to working with the members to fight for strong contracts, grow local 25 by organizing and continue to hold employers accountable,” Mari said.