MabVax Therapeutics Holdings, Inc. announced that four members of the company's Board of Directors have resigned from their positions effective as of July 31, 2018. In a separate action, Gregory Hanson, the Chief Financial Officer of the company since July 2014, and of its subsidiary, MabVax Therapeutics, Inc., since February 2014, has been appointed to fill one of the vacant board seats. Mr. Hanson has over 30 years' experience serving as the CFO, financial executive and board member of public and private life sciences and hi-tech companies. Since October 2016, he has served as a member of the board of directors of WCCT, Inc.