Thayer School's Board of Overseers was established in 1867 by Sylvanus Thayer. The members act on behalf of the Board of Trustees of Dartmouth College. Effective January 1, 2016, two Dartmouth alumni were elected as new Overseers, each for a three-and-a-half year term:

Catherine Sellman, Founder and Portfolio Manager of the Aperimus Funds and Managing Member and Founder of Aperimus Capital, LLC

Located in Marina Del Rey, California, Aperimus focuses its research efforts on companies in financial distress. Aperimus manages portfolios of investments based on this research, primarily in the US equity markets, on behalf of a group of institutions and family offices. Following a career in environmental engineering in Washington, D.C. and Telluride, Colorado, Catherine began her investment career in 2000 at Barrington Partners, an investment fund in Santa Monica, California. As a managing director, she focused on analyzing companies in financial distress.

In 2005, Catherine joined Atlas Capital, an investment fund based in Dallas, Texas. As a principal, she was responsible for idea generation, research, and trading for a segment of the fund's equity portfolio. She left Atlas to found Aperimus in December 2008. Catherine earned an AB in engineering sciences from Dartmouth in 1993 and an MBA focused on finance and accounting from the Anderson School of Business at UCLA in 2000. She guest lectures at the Anderson School on finance and accounting.

Andrew Silvernail, Chairman & Chief Executive Officer, IDEX Corporation

Before becoming CEO of IDEX in 2011 and Chairman in 2012, Andy was Vice President, Group Executive, responsible for multiple operating segments within IDEX. Prior to that, Andy held leadership roles at Rexnord Industries, Newell Rubbermaid and Danaher Corporation. He began his career as an equity research associate for Fidelity Investments. For 2011 Andy was named by Forbes Magazine and msn.com as "One of the 10 Most Powerful CEOs 40 and under" and named The Distinguished American by the Maine chapter of the National Football Foundation in 2014.

He is a Director of Stryker Corporation and MacLean-Fogg Company, a Trustee for the Manufacturers Alliance for Productivity and Innovation, and a former National Trustee for the Boys & Girls Club of America. Andy is also a member of the 2012 Class of Henry Crown Fellows at the Aspen Institute and the Young Presidents’ Organization and serves as a Director for the Harvard Business School Alumni Board. He received a BA in government from Dartmouth in 1994 and his MBA from Harvard Business School. Originally from Bucksport, Maine, Andy now lives in Lake Forest, IL with his wife, Shelby, and three children, Koster, Spencer, and Alyssa.