Mr. Barnes was the CEO of Verigy Pte. Limited from 2006 trough 2011, and Chairman of the Board from 2008 to 2011. Verigy was a leader in semiconductor capital equipment and was spun out of Agilent Technologies.  Verigy merged with Advantest in 2011.  Prior to Verigy, Mr. Barnes was Chairman and CEO of Electroglas, Inc. from 2003 through 2006. Electroglas is a leader in semiconductor probing technology.  Mr. Barnes holds a patent in microprocessor probing technology. Before Electroglas, Mr. Barnes was Chairman and CEO of Integrated Measurement Systems from 1995 to 2001. IMS was a leader in semiconductor verification and was acquired by Credence in 2001. From 1991 through 1995, Mr. Barnes was a division President at Cadence Design Systems, a leader in semiconductor design, synthesis and simulation software. Mr. Barnes has been a director of Knowles since 2014 and has Chaired the Audit, GNC, and Compensation Committees. He was elected Chairman of the Board of Knowles in 2025.