John Sheridan
President and Chief Executive Officer

Mr. Sheridan has served on our board of directors since June 2019 and as our President and Chief Executive Officer since March 2019. Prior to that, Mr. Sheridan served as our Executive Vice President and Chief Operating Officer since April 2013. Prior to joining us, 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, 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, now operating as BioTelemetry, Inc. (Nasdaq: BEAT). From March 1998 to May 2002, he served as Vice President of Operations at Digirad Corporation, a medical imaging company. Mr. Sheridan serves as a director of Acutus Medical, Inc. (Nasdaq: AFIB), an arrhythmia management company. Mr. Sheridan holds a BS in Chemistry from the University of West Florida and an MBA from Boston University. 

David Berger
Executive Vice President and Chief Operating Officer

David Berger has served as our Executive Vice President and Chief Operating Officer since February 2022 and is responsible for the Company’s manufacturing, supply chain, quality, regulatory and clinical functions.  He previously served as our Chief Business Operations and Compliance Officer since November 2020, as our Executive Vice President, Chief Legal and Compliance Officer since April 2019, and as General Counsel since August 2013.  From January 2008 until August 2013, Mr. Berger was employed at Senomyx, Inc., a taste science company, where he most recently served as Senior Vice President and General Counsel.  From April 2003 until October 2007, Mr. Berger was responsible for all commercial aspects of legal affairs at Biosite Incorporated, Biosite, a provider of medical diagnostic products, most recently serving as Vice President, Legal Affairs. Previously, Mr. Berger was an attorney at Cooley Godward LLP and Amylin Pharmaceuticals, Inc. Mr. Berger holds a BA in Economics from the University of California, Berkeley and a JD from Stanford Law School.

Rick Carpenter
Chief Technical Officer
Rick Carpenter has served as our Chief Technical Officer since November 2021.  Prior to joining our company, Mr. Carpenter served from February 2020 as the Senior Vice President of Engineering at Inseego Corporation, where he led the worldwide engineering team and was responsible for device hardware and software, cloud software, quality assurance, regulatory and product certification and technical account management. From April 2017 to January 2020, he was the General Manager of the IoMT Business and the Senior Director of Engineering at Capsule Technologies, a company that integrates medical devices and wearables into a secure medical grade system that collects data and provides it to healthcare professionals for patient monitoring. Prior to that, from May 2009 until March 2017, Mr. Carpenter served as the Senior Vice President of Engineering at Smith Micro Software. Earlier in his career, he held various engineering development and leadership roles at Nextwave Wireless, Sierra Wireless, General Dynamics, Motorola and Denso. Mr. Carpenter received a BS in Computer Science from The University of Texas Permian Basin, and completed coursework for an MS in Computer Science from The University of Texas at Arlington.
Tom Fox
Senior Vice President, Human Resources and Organizational Development

Tom Fox was appointed Senior Vice President, Human Resources and Organizational Development in August 2020.  From August 2017 to July 2020, he served as Vice President, Human Resources. Prior to this, he 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 BS in Business Administration from California State University, Fresno and a MS in Labor Relations and Human Resources Management from Michigan State University.

Elizabeth Gasser
Executive Vice President and Chief Strategy Officer

Elizabeth Gasser has served as our Executive Vice President and Chief Strategy Officer since June 2021 and is responsible for the Company’s strategy, corporate development, product management and competitive intelligence functions.  She previously served as our Executive Vice President, Strategy and Corporate Development since January 2020. Prior to joining our Company, Ms. Gasser served from June 2017 as an independent adviser providing strategic and corporate development solutions to boards and executive teams. From January 2016 to June 2017 she was Vice President of Corporate Strategy at QUALCOMM Technologies, Inc. (QTI), a subsidiary of QUALCOMM Incorporated (Nasdaq: QCOM), a global leader in the development and commercialization of technologies and products used in mobile devices and other wireless products. Prior to that, from November 2012 to January 2016 she was Vice President of Strategic Development at QTI, after serving in other strategic related roles of increasing responsibility beginning in 2006. Ms. Gasser holds a BA and an MA in Economics from the University of Cambridge.

Brian Hansen
Executive Vice President and Chief Commercial Officer

Brian Hansen has served as our Executive Vice President and Chief Commercial Officer since February 2016. Prior to joining our Company, Mr. Hansen served from September 2014 as Chief Commercial Officer of Adaptive Biotechnologies Corp. From May 2013 to September 2014, Mr. Hansen served as Head of Commercial, Sales and Marketing, of Genoptix, a Novartis Company. From December 2005 to February 2013, he served in various roles of increasing responsibility at Gen-Probe, Inc., a medical diagnostics company, most recently serving as Senior Vice President, Global Sales and Services from January 2012 to February 2013. Mr. Hansen received a BS in Business Administration from the University of Missouri-Columbia, and an MBA from the School of Business at San Diego State University.

Shannon Hansen
Senior Vice President, General Counsel, Chief Compliance Officer and Secretary
Shannon Hansen has served as Senior Vice President, General Counsel, Chief Compliance Officer and Secretary since January 2022 and is responsible for the Company's legal, compliance and privacy functions.  Before joining our Company, Ms. Hansen served as General Counsel, Corporate Secretary and Chief Privacy Officer at Alto Pharmacy from April 2020 to September 2021, where she oversaw the development of the legal, privacy and compliance functions.  Before her role at Alto Pharmacy, she held various leadership roles at Abbott, including Division Vice President and Associate General Counsel, Patents from June 2017 to February 2020, Division Vice President and Associate General Counsel for the Diabetes, Vascular and Structural Heart divisions from June 2015 to June 2017, Head of Legal for the Diabetes Division from January 2013 to June 2015, and Division Counsel, Patents from May 2009 to December 2012.  Earlier in her career, she served as a partner at Kirkland & Ellis LLP, a global law firm, and worked in the Solicitor’s Office at the United States Patent and Trademark Office.  Ms. Hansen holds a BS in Chemical Engineering from Carnegie Mellon University, and a JD from Stanford Law School.
James Leal
Senior Vice President, Operations

James Leal has served as our Senior Vice President, Operations since August 2017. Dr. Leal joined Tandem in October 2010 as Vice President, Operations.  Previously, Dr. 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. He 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. Dr. Leal is a University of Arizona graduate with a BS in Metallurgical Engineering, and both a MS and a PhD in Materials Science and Engineering.

Susan Morrison
Executive Vice President and Chief Administrative Officer

Susan Morrison has served as our Chief Administrative Officer since September 2013 and as an Executive Vice President since December 2017, and is responsible for the Company’s investor relations, corporate communications, project management, human resources and facilities functions. From April 2013 until September 2013, she served as our Vice President, Human Resources, Corporate and Investor Relations. 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 BA in Public Relations from Western Michigan University.

Rizwan Pervez
Senior Vice President, Quality and Regulatory
Rizwan Pervez joined us as Senior Vice President, Quality and Regulatory in September 2021.  Prior to joining Tandem, he was the Global Head of Quality and Regulatory Compliance for Medtronic Respiratory Intervention business, where he had executive responsibility for establishing worldwide strategy and direction. Mr. Pervez brings more than 20 years of leadership experience in Quality, Regulatory and Compliance spanning the diagnostics, point of care, in vitro diagnostics, software as a medical device, ventilation, ultrasound, surgical and interventional markets and has held senior leadership roles in global organizations including Abbott Labs., Philips Healthcare, AmerisourceBergen, and GE Healthcare. Mr. Pervez holds a BS in Computer Science from Northern Illinois University and an MBA from Lake Forest Graduate School of Management. 
Jordan Pinsker, MD
Medical Director

Dr. Jordan Pinsker joined us as Vice President and Medical Director in April 2021. He is a leading pediatric endocrinologist and prominent thought leader in artificial pancreas research.  Dr. Pinsker joined Tandem from Sansum Diabetes Research Institute in Santa Barbara, California, where he served as the Director of Artificial  Pancreas Technology since 2018. In his role at Sansum, he was a lead investigator in numerous clinical trials on automated insulin delivery systems, including Basal-IQ® and Control-IQ™ technology. Prior to this, he was Chief of Pediatric Endocrinology at Tripler Army Medical Center in Hawaii. Dr. Pinsker served as a physician in the United States Army in both Active Duty and in the California Army National Guard for more than 20 years. He completed a combined seven-year BS/MD program with Union College and Albany Medical College in New York. Dr. Pinsker is board certified in Clinical Informatics, Pediatric Endocrinology and General Pediatrics.

Libba Sapitsky
Senior Vice President, Customer Care
Libba Sapitsky joined us as Senior Vice President, Customer Care in November 2021. Ms. Sapitsky brings more than 30 years of experience in global life sciences and consumer care.  Prior to joining Tandem, she served as Vice President of Customer Service and Operations at CVS Health.  In her role at CVS, Ms. Sapitsky was a leader of member contact center operations, customer experience, client support, continuous improvement and work force management. Prior to this, she served as Senior Vice President of Customer Service at Siemens Healthineers where she led a dispersed team supporting hospitals and practitioners with contact center operations, field services, customer education and operational effectiveness.  Before that, she was a Senior Partner at Kingsley Gate, a global executive consultative search firm with a focus on life sciences, technology and financial services.  Ms. Sapitsky also has been a leader in global human resources, operations, automation support, implementation, customer experience, managed services and business development.  Ms. Sapitsky holds a BA in English from The University of Texas at Austin.
Leigh Vosseller
Executive Vice President, Chief Financial Officer and Treasurer

Leigh Vosseller has served as our Executive Vice President, Chief Financial Officer and Treasurer since June 2018, and served as Senior Vice President, Chief Financial Officer and Treasurer from January 2018 to May 2018. Ms. Vosseller is our principal financial and accounting officer. She joined us as Vice President of Finance in 2013 and was promoted to Senior Vice President of Finance in August 2017. Prior to that time, she served as Vice President and Chief Financial Officer at Genoptix, beginning in 2011, after initially joining Genoptix in 2008. Prior to that she held a senior finance position at Biosite 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 BS in Accounting from Missouri State University.