Mercer Global Advisors, Inc. has expanded its footprint in New England through the acquisition of O’Brien Wealth Partners, a well-established, woman-led wealth management firm based in Waltham, Massachusetts. The acquisition brings approximately $1.1 billion in client assets under the Mercer Advisors group and adds a team with a strong track record in personalized, multigenerational wealth planning.
Founded in 1986, O’Brien Wealth Partners has been serving over 500 clients across New England and beyond, offering tailored financial planning, investment management, and sustainable investing services. The firm is known for its values-based approach, focusing on women, couples seeking financial empowerment, and nonprofits prioritizing sustainability.
“We were looking for a partner who could honor the care and continuity we’ve provided clients for decades, while advancing our vision for thoughtful, intentional growth,” said Jill Fopiano, President and CEO of O’Brien Wealth. “Mercer Advisors brings deep planning expertise, institutional-level capabilities and a genuine respect for how we serve. Just as importantly, they understand the power of diverse leadership and a collaborative culture, making this a natural next chapter for our team and the families we support.”
The partnership enables the O’Brien team and its clients to access Mercer Advisors’ full suite of family office services, including tax services, estate strategies, corporate trustee services, and advanced investment management.
Dave Welling, CEO of Mercer Advisors, shared his view on the alignment between the two firms. “Our conversations with the O’Brien team highlighted that we share a common foundation of acting in our clients’ best interest and in the belief that teamwork and culture are the key ingredients to success,” he said. “Jill and the O’Brien team have built one of the most respected advisory firms in New England, defined by integrity, intentional growth, and enduring client relationships. They’ve created a strong culture of mentorship, inclusion and excellence that reflects where the industry is headed.”
Martine Lellis, Principal, M&A Partner Development at Mercer Advisors, emphasized the strategic impact of the acquisition. “The O’Brien team exemplifies the kind of talent and leadership we seek in a partner—rooted in decades of client trust and energized by a forward-thinking approach to financial planning,” she said. “This partnership not only deepens our roots in Boston but also supports our broader efforts to deliver personalized, planning-led advice that evolves with our clients’ lives. We’re excited to support their continued growth and help amplify their impact across the region.”
Ben Kautz, Executive Managing Director at Mercer Advisors, also commented on the synergy between the two firms. “O’Brien Wealth brings a distinctive, high-touch model and a forward-thinking team that aligns well with our service philosophy. By joining forces, we can equip them with additional resources—from integrated technology to family office services—that support sustainable growth and deepen client impact in a competitive market like Greater Boston.”
Colchester Partners acted as the exclusive financial advisor to O’Brien Wealth in this transaction.
