BDO USA Names New National Managing Principals for Assurance and Tax, Signaling Next Phase of Growth

Demetrios Frangiskatos leads Assurance Practice; Mat DeMong leads Tax Practice

CHICAGO--(BUSINESS WIRE)--BDO USA, one of the nation’s leading accounting and advisory firms, announces the appointment of two new national managing principals to lead the firm’s assurance and tax practices as it continues to grow and drive innovation in the profession. Demetrios Frangiskatos has assumed the role of National Managing Principal of Assurance, effective July 1, 2025, and Mat DeMong has assumed the role of National Managing Principal of Tax, effective January 1, 2026.

“These appointments reflect BDO’s unwavering commitment to empowering leaders who have a proven track record and will positively shape the future of our firm,” said Wayne Berson, CEO of BDO USA. “Demetrios and Mat have each showcased the ability to drive growth, deliver client value, and cultivate the next generation of leadership. I am confident their vision will further strengthen our assurance and tax practices, positioning BDO for continued success.”

Frangiskatos Building a Quality-First Assurance Culture Centered on People and Clients

Demetrios Frangiskatos, a proven leader and the architect of BDO’s digital audit strategy, joined BDO in 2000 and became a partner (now principal) in 2011. With more than 25 years of experience driving innovation and delivering client value, he is well positioned to guide the practice’s next era of growth and transformation. In this role, Frangiskatos defines the strategy and oversees the team and client delivery experience across BDO’s audit, attest, financial accounting advisory, and technology risk capabilities.

“I am honored to lead our assurance practice into the future,” said Frangiskatos. “Our vision is clear: We are building a culture where the best talent thrives, premier clients seek our counsel, and quality stands at the center of everything we do. We achieve that vision by investing in our people – supporting their growth and equipping them with the resources and technology they need – all while delivering exceptional experiences that earn confidence.”

Frangiskatos’s leadership has been instrumental in shaping BDO’s approach to innovation and quality, helping clients navigate an evolving regulatory landscape and seize opportunities in the capital markets.

Most recently, Frangiskatos served as assurance managing partner of the firm’s east region and oversaw the BDOAdvantage team – the firm’s assurance digital audit suite – which advances audit quality through innovation. He previously served as Technology & Media Group industry leader and sat on the Audit Quality Advisory Council.

DeMong Emphasizing Collaboration and Client-Focused Approach Within Tax

Mat DeMong, recognized for his forward-thinking leadership and commitment to thoughtfully embracing technology, joined BDO in 2004 as a tax associate and steadily expanded his strategic oversight by embracing a collaborative “one firm” philosophy. He leverages the full strength of BDO’s tax practice, industry groups, and internal teams to deliver significant results to the firm’s clients. A catalyst for innovation, DeMong is at the forefront of shaping the tax practice’s talent strategy and has championed the adoption of BDO Tax UserVerse – a game-changing platform to better serve BDO’s clients – and other transformative technologies.

“Knowing the remarkable talent that exists across the tax leadership team, I am honored to be chosen for this role,” says DeMong. “I am grateful for the trust placed in me and am fully committed to our tax vision, which remains centered around a total tax focus and client-centric service delivery.”

After becoming a tax partner (now principal) in 2013, DeMong was appointed managing partner of the Boston Tax office and later named northeast tax regional managing partner in 2019. He has held his current role as east tax managing principal since 2023.

Frangiskatos is a member of the executive team, reporting to Berson. Upon Matt Becker assuming the role of BDO USA CEO on July 1, 2026, DeMong will join the Executive Team and report directly to Becker.

About BDO USA

Our purpose is helping people thrive, every day. Together, we are focused on delivering exceptional and sustainable outcomes and value for our people, our clients and our communities. BDO is proud to be an ESOP company, reflecting a culture that puts people first. BDO professionals provide assurance, tax and advisory services for a diverse range of clients across the U.S. and in over 160 countries through our global organization.

BDO is the brand name for the BDO network and for each of the BDO Member Firms. BDO USA, P.C., a Virginia professional corporation, is the U.S. member of BDO International Limited, a UK company limited by guarantee, and forms part of the international BDO network of independent member firms. For more information, please visit: www.bdo.com.