Mr. Todd A. Waltz has been the Chief Financial Officer of Aemetis, Inc., since March 12, 2010 and has been its Executive Vice President and Secretary since March 2010. Mr. Waltz serves as the Chief Financial Officer of Aemetis Advanced Fuels Keyes, Inc. Mr. Waltz has been Controller of AE Biofuels, Inc. since June 2008. He serves as a Chief Financial Officer and Principal Accounting Officer of AE Biofuels, Inc. He served as Chief Executive Officer and President at Eco-Stim Energy Solutions, Inc until December 11, 2013. He served as interim Controller for AE Biofuels since July 2007. From 2007 to March 12, 2010, Mr. Waltz served as the Corporate Controller of Aemetis, Inc., and its Principal Accounting Officer. He served as the Chairman of the Board, Chief Executive Officer, President, Secretary and Treasurer of Vision Global Solutions, Inc., since November 3, 2009. He served as Principal Financial Officer and Chief Accounting Officer at Vision Global Solutions, Inc. He spent 12 years at Apple Inc., (NASDAQ:AAPL) and manaed all financial aspects for the .Mac and Online Services businesses. From 1994 to 2007, he served with increasing responsibility in a variety of senior financial management and business partner roles in the On-line Services and R&D divisions of Apple, Inc. Mr. Waltz has more than 25 years experience in public and private accounting with global public firms. He served as a Director of Vision Global Solutions, Inc. since November 3, 2009. He is a Certified Public Accountant in the state of California. Mr. Waltz received his bachelor degree from Mount Union College in 1983, an MBA from Santa Clara University in 1997 and his Master of Science in Taxation from San Jose State University in 2008.