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B. Kristine Johnson has served as a member of the board of directors since April 2020. Ms. Johnson is currently the President and General Partner of Affinity Capital Management, a venture capital firm, since 2000. She has served as a member of the board of directors of AtriCure, Inc. (NASDAQ: ATRC), a medical device company, since March 2017, and as Chairperson of the board since April 2021. Ms. Johnson has served as a member of the board of directors of ClearPoint Neuro (NASDAQ: CLPT), a medical device company, since August 2019. She served as a member of the board of directors of Piper Sandler, an investment banking firm, from 2003 to 2019. Ms. Johnson served as a member of the board of directors of The Spectranetics Corporation (NASDAQ: SPNC), a medical device company, from 2012 to 2017. She held various executive leadership positions at Medtronic (NYSE: MDT) from 1982 to 1999. Ms. Johnson serves as a member of the board of directors of the University of Minnesota Foundation Investment Advisors. She holds a B.A. from St. Olaf College.