Wesley E. Johnson Jr. joined the Company's Board of Director's in January 2007. From 2003-07, Mr. Johnson served as a member of the board of RITA Medical Systems Inc. Since February 2008, Mr. Johnson has served as President, Chief Executive Officer and director of Cardiokinetix Inc., a developer of medical devices for the treatment of congestive heart failure. From October 2005 to February 2008 he served as General Manager of Abbott Spine S.A., a division of Abbott Laboratories. From June 2003 to October 2005, Mr. Johnson served as Division Vice President, Finance for Abbott Spine. From May 1999 to June 2003 he served as Vice President of Operations and Chief Financial Officer for Spinal Concepts. Mr. Johnson has a B.B.A. in accounting from Texas A&M University and became a Certified Public Accountant in 1981.