Mr. Blickenstaff has served as our Executive Chairman since March 2019 and as one of our directors since September 2007. He previously served as our President and Chief Executive Officer from September 2007 to February 2019. Prior to joining our company, Mr. Blickenstaff served as Chairman and Chief Executive Officer of Biosite Incorporated, or Biosite, a provider of medical diagnostic products, from 1988 until its acquisition by Inverness Medical Innovations, Inc. in June 2007. Mr. Blickenstaff previously served as a director of Medivation, Inc. (NASDAQ: MDVN), a biotechnology company, from 2005 to 2016, until its acquisition by Pfizer, and as a director of DexCom, Inc. (NASDAQ: DXCM), a provider of continuous glucose monitoring systems, from June 2001 to September 2007. Mr. Blickenstaff was formerly a certified public accountant and has more than 20 years of experience overseeing the preparation of financial statements. He received a B.A. in Political Science from Loyola University, Chicago, and an M.B.A. from the Graduate School of Business, Loyola University, Chicago.
John Sheridan has served as our President and Chief Executive Officer since March 2019. He previously served as our Executive Vice President and Chief Operating Officer since April 2013. Prior to joining our company, Mr. Sheridan served as Chief Operating Officer of Rapiscan Systems, Inc., a provider of security equipment and systems, from March 2012 to February 2013. Mr. Sheridan served as Executive Vice President of Research and Development and Operations for Volcano Corporation (NASDAQ: VOLC), a medical technology company, from November 2004 to March 2010. From May 2002 to May 2004, Mr. Sheridan served as Executive Vice President of Operations at CardioNet, Inc., a medical technology company. From March 1998 to May 2002, he served as Vice President of Operations at Digirad Corporation, a medical imaging company. Mr. Sheridan holds a B.S. in Chemistry from the University of West Florida and an M.B.A. from Boston University.
David Berger joined Tandem in August 2013. Prior to joining the company, he served as Senior Vice President, General Counsel and Corporate Secretary at Senomyx, Inc., which he joined in 2008. His prior experience includes serving as Vice President, Legal Affairs at Biosite Incorporated, where he was the managing attorney responsible for all commercial aspects of legal affairs, and serving as an attorney with Cooley Godward LLP. Mr. Berger received his J.D. at Stanford Law School and a B.A. in Economics from the University of California, Berkeley.
Tom Fox was appointed Vice President, Human Resources in August 2017. He previously served as Senior Director of our Human Resources Department. Mr. Fox has more than 20 years of experience in Human Resources management. Prior to joining Tandem, Mr. Fox served as Director of Human Resources for the Oncology-Genoptix Division of Novartis Pharmaceuticals. Before that, he held various HR leadership positions including Director of Human Resources for the West Division of BDO, USA LLP; Director of HR Client Services for Option One Mortgage Company (a subsidiary of H&R Block Corp.) and Director of Labor and Employee Relations at The Walt Disney Company, Disneyland Resort. Mr. Fox began his career at Chevron Corporation and holds a B.S. in Business Administration from California State University, Fresno and a M.S. in Labor Relations and Human Resources Management from Michigan State University.
Brian Hansen joined us as our Executive Vice President and Chief Commercial Officer in February 2016 with more than 20 years of sales and leadership experience in the clinical diagnostics industry. Prior to joining Tandem, Mr. Hansen was Chief Commercial Officer at Adaptive Biotechnologies Corporation. Before that, he held executive and senior-level positions at Genoptix (a Novartis-owned company), Gen-Probe (acquired by Hologic in 2012) and Fisher Scientific. Mr. Hansen received an MBA from the School of Business at San Diego State University and a B.S. in Business Administration from the University of Missouri-Columbia.
Julia Kensick was appointed Vice President, Quality in August 2017. She previously served as Senior Director of Quality and has overseen the department since September of 2013. Ms. Kensick has more than 25 years of experience in quality, regulatory and customer affairs. Prior to joining Tandem, Ms. Kensick served as Director of Quality for the Infusion Business Unit of CareFusion. Before that, she held positions including Executive Director of Regulatory and Customer Affairs for Ophthonix and Quality Assurance Director at American Medical Systems (Formerly CryoGen Inc.). Ms. Kensick began her career in the Vascular Intervention Group at Guidant and holds a Bachelor of Science in Mechanical Engineering from San Diego State University.
Jim Leal has served as our Senior Vice President, Operations since August, 2017. Mr. Leal joined Tandem in October 2010 as Vice President, Operations bringing 25 years of manufacturing and engineering experience. Previously, Mr. Leal was the Vice President of Manufacturing and Field Support for Volcano Corporation and held Director Roles with CardioNet, Inc. and Digirad Corporation. He held Senior Engineering roles with FlipChip Technologies and Hughes Aircraft Company. Jim has won several awards including a Hughes Aircraft Doctoral and Masters Fellowship and was a recognized nominee for Most Promising Hispanic Engineer of the Year Award. Mr. Leal is a published author and patent holder. He is a University of Arizona graduate with a Ph.D. in Materials Science and Engineering.
Susan Morrison was appointed Chief Administrative Officer in September 2013. She previously served as our Vice President, Human Resources, Corporate and Investor Relations since April 2013. Ms. Morrison served as our Director, Corporate and Investor Relations, from January 2009 to March 2013, and was our Director, Corporate Services from November 2007 to December 2008. Prior to joining our company, Ms. Morrison held various positions in Corporate and Investor Relations at Biosite from August 2003 through November 2007. Ms. Morrison holds a B.A. in Public Relations from Western Michigan University.
Leigh Vosseller was appointed Chief Financial Officer effective January 1, 2018. Previously, Ms. Vosseller served as our Senior Vice President, Finance from August 2017. Ms. Vosseller joined Tandem in August 2013 as Vice President, Finance. Prior to joining Tandem, Ms Vosseller served in various senior finance positions in the healthcare industry. Most recently, she was Vice President and CFO of Genoptix, Inc. (a Novartis company). Prior to that she held a senior finance position at Biosite Incorporated where she played a key role in developing the financial and administrative infrastructure for international expansion. Ms. Vosseller is a certified public accountant (inactive) and holds a bachelor’s degree in accounting from Missouri State University.
Manuel Jaime joined us as our Senior Vice President, Technology and Digital Health in February 2019 with more than 20 years of experience in incubating and commercializing emerging products and services in the high-tech industry. Prior to joining Tandem, Mr. Jaime was Chief Technology Officer at Cedar Electronics. Before that, he was a co-founder and Chief Executive Officer of ClipCast Technologies, and he previously held various roles at CardioNet and Qualcomm. He also is an inventor on more than 20 patents relating to connected devices, wireless systems, video platforms, and low-power radio frequency. Mr. Jaime is a graduate of the Leaders for Global Operations (LGO) Program at the Massachusetts Institute of Technology (MIT) Sloan School of Management where he received an MBA and a MS in Mechanical Engineering. He also holds a BS in Mechanical Engineering and a MS in Systems Engineering from MIT.