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Mr. Johnson has served as a director of Mirati since September 2013 and serves on the boards of directors for several life science companies. He is currently a director for Heron Therapeutics Inc. (NASDAQ: HRTX), Adamis Pharmaceuticals Corporation (NASDAQ: ADMP), and La Jolla Pharmaceutical Company (NASDAQ: LJPC). Mr. Johnson also served as a past director of Ardea Biosciences Inc. (NASDAQ: RDEA) from 2008 until its sale to AstraZeneca PLC in 2012. In addition to his board service, Mr. Johnson has served as an advisor to Daisas Medical, LLC since 2012. From 2011 to 2012 he was Chief Financial Officer of PURE Bioscience Inc., and from 2010 to 2011 he was Senior Vice President and Chief Financial Officer of NovaDel Pharma Inc. Mr. Johnson served as Vice President and Chief Financial Officer of TorreyPines Therapeutics Inc. from 2004 until its sale to Raptor Pharmaceuticals Corp. in 2009, and then as Vice President of a wholly-owned subsidiary of Raptor Pharmaceutical Corp. from 2009 to 2010. He held several positions, including Chief Financial Officer and Senior Vice President of Operations, at MitoKor Inc. from 1994 to 2004. Prior to 1994, Mr. Johnson held senior financial positions with several early-stage technology companies, and also practiced as a Certified Public Accountant with Price Waterhouse. Mr. Johnson received his B.B.A. in accounting from the University of Michigan-Dearborn.