The Board of Trustees elected two new members who will serve four-year terms, beginning July 1, and selected a new chair who will begin that role on Jan. 1, 2026.

Barry Caldwell ’82 and Hadley Mullin ’96 will join the 26-member board, and Gregg Lemkau ’91 will become the new chair.

“I am thrilled to have Barry and Hadley joining the board,” says Trustees Chair Elizabeth Cahill Lempres ’83, Thayer ’84. “They each bring an abundance of leadership experience and knowledge that will help further our support of Dartmouth’s mission.”

Lempres’ own role as chair of the Board of Trustees has been extended through December. This six-month extension follows the election of Lemkau and will facilitate his transition as incoming board chair when he assumes leadership of the trustees in January.

“I am grateful Dartmouth will continue to benefit from the visionary leadership and the tireless commitment of Liz Lempres as chair,” President Sian Leah Beilock says. “Her guidance and mentorship have been invaluable since my introduction to Dartmouth. We are fortunate she has extended her term to ensure Gregg Lemkau has the smoothest possible transition into his new role as chair.”

“I join Liz in welcoming Barry and Hadley to the board, knowing that it is a logical extension of their years of dedication to Dartmouth,” says President Beilock.

Trustees Richard Lewis ’84 and Elizabeth Mahoney Loughlin ’89 are leaving the board this June after completing the traditional two terms of service.

“Ric and Ellie have had an incredible impact as board members over the last eight years,” says Lempres. “As a vice chair for the last two years, co-chair of the Resources Committee, and chair of the Facilities Committee before that, Ric has been a relentless champion for upgrading Dartmouth’s campus and a powerful force driving our efforts to improve housing.”

“Ellie is among Dartmouth’s most dedicated and beloved volunteers,” Lempres says. “As the long-time chair of the board’s Advancement Committee, she has traveled the globe as an ambassador for Dartmouth. She is a keen observer and astute listener who brings home what she learns to ensure trustees understand our wide range of constituents and their concerns.”

Gregg Lemkau ’91

Lemkau joined the Board of Trustees in 2020 and is co-chief executive officer of BDT & MSD Partners, a merchant bank with an advisory and investment platform serving family business owners and founders. He was previously CEO of MSD Partners, a predecessor firm of BDT & MSD that deployed capital on behalf of Michael Dell and his family as well as other like-minded, long-term oriented investors.

Prior to that, Lemkau was co-head of the Investment Banking Division at Goldman Sachs and served on the firm’s Management Committee. During his 28 years at Goldman Sachs, he advised clients on hundreds of transactions representing over $1 trillion while working in offices across the United States and Europe.

Lemkau studied government and economics at Dartmouth and played goalkeeper on the men’s soccer team. He resides in Bedford, N.Y., where he and his wife Kate raised their four children.  In addition to his Dartmouth service, Lemkau is a corporate director of Culligan International, Qualtrics, Discovery Land Company and Spurs Sports & Entertainment.

He is also a member of the Board of Trustees at Rockefeller University and serves on the Board of Advisors for Team Rubicon, whose mission is to unite military veterans with first responders to rapidly deploy emergency response teams. He previously served as chairman of the board of directors for Grassroot Soccer, a nonprofit using the power of soccer to fight against HIV and AIDS in Africa.

Barry Caldwell ’82

Caldwell’s career has spanned law, public service, trade association advocacy, executive leadership, and board governance. He supports nonprofits in energy and education as a principal of Wroxton Civic Ventures. Prior to that, he spent 16 years on the senior leadership team at Waste Management in roles including chief people officer, chief legal officer, and senior vice president of public affairs and communications. He has also held leadership roles in government relations for Cigna Corp. and the Pharmaceutical Research and Manufacturers of America. 

At Dartmouth, Caldwell majored in history and played on the men’s basketball team. His service as an alumnus has included participation in the President’s Leadership Council and on the executive committees for the Association of Alumni and The Call to Lead campaign. He co-led his class’s efforts establishing the African and African American Studies Department’s Academic Enrichment Fund. As a member of the Alumni Council, he chaired the Professional Development Committee and also served on the Executive, Nomination, and Governance committees. 

Caldwell serves on the board of Rubicon Technologies as well as public charter schools KIPP DC and Washington Latin, and the Public Defender Service for the District of Columbia. His public service began as counsel and, later, chief of staff to U.S. Sen. Arlen Specter. He holds a JD from Georgetown and began his career practicing law in Washington, D.C., where he lives today.

Hadley Mullin ’96

Mullin is a senior managing partner at TSG Consumer Partners, a private equity firm with approximately $14 billion in assets under management. She joined TSG more than 20 years ago and plays a key role in overseeing the firm’s investment strategy and management, working across all aspects of the investment lifecycle from sourcing through portfolio company exit. Prior to TSG, Mullin worked in a variety of practice areas at Bain & Company, including conducting strategic and operational due diligence for Bain’s private equity clients. In 2023, Fortune magazine named her one of the most powerful people in private equity.

For Dartmouth, Mullin served on the Presidential Commission on Financial Aid as well as on the Board of Trustees’ Investment Committee, and she chaired the Nominating Committee for the Alumni Council. She also serves on the Stanford Graduate School of Business’ Advisory Council and the Stanford Management Company Investment Committee, and she chairs the board of the Branson School, a private high school in the Bay Area.

Mullin studied government at Dartmouth, graduating magna cum laude, and is a member of Phi Beta Kappa. She earned an MBA from Stanford’s Graduate School of Business, where she was an Arjay Miller Scholar. Mullin and her husband, Dan Kalafatas ’96, live in the Bay Area with their three children, including one who is attending Dartmouth.