Ms. Holt served as president and chief executive officer of Proto Labs, Inc., a manufacturer of custom prototypes and on-demand product parts, from 2014 until her retirement in 2021, and previously led Spartech Corporation from 2010 until its 2013 sale to PolyOne. Earlier she was senior vice president, Glass & Fiberglass at PPG Industries, Inc. from 2003 to 2010. She currently serves on the boards of Waste Management, Inc. and Piper Sandler Companies, and chairs A. O. Smith's Nominating and Governance Committee.