Tuff Yen has served as a member of our board of directors since March 2019. Mr. Yen is the founder and president of Seraph Group LLC, an investment firm he founded in 2004 after working at Chemical Venture Partners and Chase Capital Partners. Mr. Yen currently serves on the board of directors of Zeto, Inc., a medical equipment manufacturer. He previously worked at biotechnology companies Genentech and Amgen in both manufacturing and new product development. Mr. Yen received his undergraduate degree in microbiology and immunology from the University of California Berkeley and his M.B.A. from the Yale School of Management.