People Behind The Pump

Our products only tell half the story. At Tandem Diabetes Care, we put as much effort into standing behind our products as we do into designing them. The passion within each individual who works at Tandem is apparent. From product developers and engineers, to the people on our 24/7 customer support team, everyone has the drive to succeed and the desire to make a difference in people’s lives.


Manager, Human Resources Business Partner & HRIS

"I've worked in medical device and biotech for most of my career and the diabetes space is without a doubt the most passionate group of people I've had the honor to work with. Here at Tandem we work with a large number of employees directly impacted by the disease.

Prior to working at Tandem I was consulting, which gave me the unique opportunity to work at several companies over a short period of time. It didn't take long to figure out that this place was different. Cool people, great product, and an environment where your ideas are heard.

If I could implement one new thing here, it would be group hugs every morning. If you don't like this idea, raise your hand, you most likely need it most.” 



Commercial Contracts Administrator

"My college roommate was the first person with type 1 diabetes I met. After supporting her through a hypoglycemic episode that required hospitalization, I dedicated myself to the diabetes and medical device fields. 

Tandem is an open-minded company that listens to employees’ ideas and supports them with a, “let’s do this!” attitude. The same culture extends to our research and development where the user experience of real patients is studied. Patients provide relevant feedback to create consumer goods that patients actually find helpful in their daily life. Tandem’s consistent approach to working with people inside and out is a unique quality that resonates with modern values and produces products that are truly inspired by patients. 

If you visit, and say hello to someone in jeans and t-shirt, it was probably one of our executives. If I could change one thing about Tandem, I’d have all of our employees in one building!"



User Experience Researcher

“I have no direct personal connection to diabetes, but my interest in medical devices, and the rigorous process necessary to make them user friendly and safe to use, led me to Tandem. I most like the fast paced nature of my job, and that every day requires critical thinking about how people interact with technology. Also, the people I work with are great collaborators.”


Human Resources Coordinator

“Coming out of college my dream was to find a job in the diabetes industry. I have diabetes and I heard about Tandem through a friend who was using the t:slim and loved how cool and modern the pump was. From then on I kept an eye on Tandem’s job board.” 




“I don’t have diabetes, but my dad, grandpa, and grandma do. I believe that a smile goes a long way and has the potential to turn life around. I’m a dreamer who loves to try new things. I love being able to help people and be part of a great team here at Tandem.” 


Sr. Administrative Assistant, Customer Technical Support

"My interest in our product led me to pursue my role in tech support. Everyone should know that the people who work here are genuine. We care about each other, and we care about our customers. I am happy to be surrounded by people who accept me and share the same passion I do – helping other people."


Sr. Customer Support Trainer

"The passion that fills the Tandem hallways is contagious. I have had diabetes for almost 20 years and I feel so blessed to give back to our community by working with so many caring people on our customer support staff. As a patient and a colleague, I am proud to be part of this hard-working team that genuinely cares about getting to know the people we serve."


Clinical Diabetes Specialist

“I have had type 1 diabetes since I was 11 years old and have been on insulin pump therapy since I was 12. My diagnosis led me to my career of becoming a nurse and CDE and hoping to inspire and help people through my personal experiences of living everyday with diabetes. As soon as I started on the t:slim Insulin Pump I knew that it was a product I truly loved and believed in, and from that moment I kept my eyes open for an opportunity with Tandem. Finally, in 2013, I got that opportunity and I could not be happier to be living every day with the opportunity to advocate for patients to be on the best insulin pump out on the market and help them gain better control of their diabetes. For the first time in my career, I am able to say that I love my job!”
Blue_Circle_HiRes (Social)_NSM_Al Singer_FINAL_20150714


Territory Manager

"I was diagnosed with type 1 diabetes at age two, 36 years ago. I have never known anything else. Checking sugars and giving myself injections was always just another chore, like brushing my teeth or combing my hair. Growing up, I played football, skydived, and traveled extensively. Although diabetes was challenging, I never let it stop me from accomplishing my goals. I was drawn to Tandem because of the focus on making the lives of people living with diabetes better by finding ways to make managing it easier. After using injections for 34 years, I chose the t:slim Insulin Pump to be my first pump. I feel like the t:slim Pump was truly built for me. There is no greater joy than to help a patient who is new to pump therapy take their first steps with our pump, and then hear back from them about how much better they feel about their diabetes management. I want everyone to know that we want to know what we can do to be better than we are today. Tell us what you really think!"


Clinical Diabetes Specialist

“I have been living with diabetes for 25 years. When I heard about Tandem and what they were doing for the diabetes community I knew I had to be a part of it. What I love most is that a lot of our employees live with diabetes and we understand that a pump isn’t just a pump, it is more personal than that. We take our patients’ feedback seriously and implement needed changes.”


Territory Manager

“I have family members with diabetes, and more importantly, my clinical partner, Chelsie is living with diabetes. A friend referred me to Tandem and it has been a wonderful experience. Tandem really listens to what health care professionals and patients have to say, and takes action directly as a response to that feedback. Knowing that I have the ability to provide solutions to people’s needs is the most rewarding part of my job.”


Customer Technical Support Supervisor

"I chose to work at Tandem because I have a family member and a loved one living with type 2 diabetes and it was an exciting start-up company when I began. Since then, Tandem has given me the opportunity to grow into a leadership position where every day I am able to help a lot of people, customers and teammates alike. The culture here is legendary in the biotech community, especially since Tandem’s employees, including myself, really believe in the product we are supporting."


Board of Directors


Dick Allen 
Chairman of the Board 
Dick P. Allen has served on Tandem's board of directors since July 2007, and previously served as the Company's Chairman from August 2007 to January 2013. Mr. Allen is also engaged directly in the diabetes community through his personal involvement with JDRF and the Mary & Dick Allen Diabetes Center at Hoag Hospital. Mr. Allen is the immediate past chairman of the international board of directors of JDRF, and served as a member of the JDRF Board of Directors from July 2008 to June 2014. Mr. Allen has more than 45 years of experience in the health care industry and was previously the President of DIMA Ventures, Inc., a private investment firm providing seed capital and board-level support for start-up companies in the healthcare field. He was a co-founder and Vice President of Caremark, Inc., a home infusion therapy company that was later acquired by Baxter International. He was also a co-founder and director of Pyxis Corporation that was later acquired by Cardinal Health, Inc. Mr. Allen received a B.S. (cum laude) from Yale University and an M.B.A. from Stanford University Graduate School of Business where he served on the faculty as a Lecturer in Strategic Management for thirteen years.

Kim Blickenstaff
President and Chief Executive Officer
Kim D. Blickenstaff has served as our President and Chief Executive Officer and as one of our directors since September 2007. Prior to joining our company, Mr. Blickenstaff served as Chairman and Chief Executive Officer of Biosite Incorporated, a provider of medical diagnostic products, from 1988 until its acquisition by Inverness Medical Innovations, Inc. in June 2007. Mr. Blickenstaff currently serves as Chairman of Medivation, Inc. (NASDAQ: MDVN), and is a member of its audit committee and compensation committee. He previously served as a director of DexCom, Inc. (NASDAQ: DXCM), a provider of 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. 

Edward Cahill
Edward L. Cahill has served on our board of directors since May 2009. Mr. Cahill has served as Managing Partner of HLM Venture Partners, a venture capital firm that invests primarily in emerging companies focused on healthcare information technology, healthcare services and medical technology, since May 2000. He served as a director of Animas Corporation, a developer of external insulin pumps, from March 2001 until its acquisition by Johnson & Johnson in February 2006, during which time Animas Corporation conducted an initial public offering and became a publicly-traded company. From June 1995 to May 2000, Mr. Cahill served as a founding partner of Cahill, Warnock Company (now Camden Partners), a Baltimore venture capital firm. Previously, Mr. Cahill was a Managing Director of Alex.Brown & Sons, an investment services brokerage, where he headed the firm's healthcare group from January 1986 through March 1995. Mr. Cahill also serves as a director of Masimo Corporation (NASDAQ: MASI), a medical technology company. He is also a director of several private healthcare companies and serves as a trustee of Johns Hopkins Medicine, Johns Hopkins Health System and Mercy Health Services. Mr. Cahill holds an A.B. in American Civilization from Williams College and a Masters of Public and Private Management from Yale University.

Fred Cohen, MD, DPhil
Fred E. Cohen, M.D., D.Phil. has served on our board of directors since June 2013. Dr. Cohen is a partner at TPG, a private equity firm he joined in 2001, and serves as co-head of TPG’s biotechnology group. Dr. Cohen served as a Professor of Cellular and Molecular Pharmacology at the University of California, San Francisco, from 1988 until 2014. From 1995 to 2001, Dr. Cohen served as the Chief of the Division of Diabetes, Endocrinology and Metabolism in the Department of Medicine of UCSF. Dr. Cohen also serves as a director of Genomic Health (NASDAQ: GHDX), Roka Bioscience (NASDAQ: ROKA), CareDx (NASDAQ: CDNA), Quintiles Transnational Holdings (NYSE: Q), Five Prime Therapeutics (NASDAQ: FPRX), Biocryst (NASDAQ: BCRX) and Veracyte (NASDAQ: VCYT). In addition, Dr. Cohen serves as a director of several privately held companies. Dr. Cohen holds a B.S. in Molecular Biophysics and Biochemistry from Yale University, a D.Phil. in Molecular Biophysics from Oxford University and an M.D. from Stanford University.

Howard (Ted) Greene, Jr.
Howard E. Greene, Jr. has served on our board of directors since January 2008. Mr. Greene is an entrepreneur who has participated in the founding and management of 11 medical technology companies over 25 years, including three companies for which he served as chief executive officer. He was the co-founder of Amylin Pharmaceuticals, Inc., a public pharmaceutical company that was acquired by Bristol Myers Squibb in August 2012, serving as the Chief Executive Officer of that company from 1987 to 1996. He also served as a director of Amylin Pharmaceuticals from 1987 to April 2009. Mr. Greene also served on the board of directors of Biosite from June 1989 until its acquisition by Inverness Medical Innovations, Inc. in 2007. From 1986 until 1993, Mr. Greene was a founding general partner of Biovest Partners, a seed venture capital firm. He was Chief Executive Officer of Hybritech Incorporated from March 1979 until its acquisition by Eli Lilly & Co. in March 1986, and he was co-inventor of Hybritech’s patented monoclonal antibody assay technology. Prior to joining Hybritech, he was an executive with the medical diagnostics division of Baxter Healthcare Corporation and a consultant with McKinsey & Company. Mr. Greene holds a B.A. in Physics from Amherst College and an M.B.A. from Harvard Business School.

Douglas Roeder
Douglas A. Roeder has served on our board of directors since May 2009. Mr. Roeder joined Delphi Ventures as an Associate in 1998, and has been a Partner since 2000, focusing on medical devices, diagnostics and biotechnology. Prior to joining Delphi Ventures, Mr. Roeder was an Associate with Alex.Brown’s Healthcare Investment Banking Group in San Francisco, where he focused on the medical device, life sciences and healthcare services industries. He also previously worked with Putnam Associates, a strategy consulting firm focused on the pharmaceutical and biotechnology industries. Mr. Roeder holds an A.B. in Biochemistry from Dartmouth College.

Jesse Treu, PhD
Jesse I. Treu, Ph.D. has served on our board of directors since June 2008. Dr. Treu has been a Managing Member of Domain Associates, L.L.C. since its inception in 1985. He has been a director of over 35 early-stage healthcare companies. Dr. Treu currently serves as a member of the boards of directors of Afferent Pharmaceuticals, Aldexa Pharmaceuticals, CoLucid Pharmaceuticals, Regado Biosciences and Veracyte. He has also served as a founder, president and chairman of numerous venture-stage companies. Prior to the formation of Domain Associates, Dr. Treu had twelve years of experience in the healthcare industry. He was Vice President of the predecessor organization to The Wilkerson Group and its venture capital arm, CW Ventures. While at CW Ventures, he served as President and CEO of Microsonics, Inc., a pioneer in computer image processing for cardiology. From 1977 through 1982, Dr. Treu led new product development and marketing planning for immunoassay and histopathology products at Technicon Corporation, which is now part of Siemens Diagnostics. Dr. Treu began his career with General Electric Company in 1973, initially as a research scientist developing thin film optical sensors for immunoassay testing, and later serving on the corporate staff with responsibility for technology assessment and strategic planning. Dr. Treu received his B.S. in Physics from Rensselaer Polytechnic Institute and his M.A. and Ph.D. in physics from Princeton University.

Christopher Twomey
Christopher J. Twomey has served on our board of directors since July 2013. From March 1990 until his retirement in 2007, Mr. Twomey held various positions with Biosite, most recently serving as Senior Vice President, Finance and Chief Financial Officer. From 1981 to 1990, Mr. Twomey worked for Ernst & Young LLP, where he served as an Audit Manager. Mr. Twomey served as a director and audit committee chair of Cadence Pharmaceuticals, Inc., a biopharmaceutical company, from July 2006 until its acquisition by Mallinckrodt in 2014. Mr. Twomey has also served as a member of the board of directors of Senomyx since March 2006 and is chair of that company's audit committee. Mr. Twomey holds a B.A. in Business Economics from the University of California at Santa Barbara.

Executive Team


Kim Blickenstaff
President and Chief Executive Officer

Kim D. Blickenstaff has served as our President and Chief Executive Officer and as one of our directors since September 2007. Prior to joining our company, Mr. Blickenstaff served as Chairman and Chief Executive Officer of Biosite Incorporated, a provider of medical diagnostic products, from 1988 until its acquisition by Inverness Medical Innovations, Inc. in June 2007. Mr. Blickenstaff currently serves as Chairman of Medivation, Inc. (NASDAQ: MDVN), and is a member of its audit committee and compensation committee. He previously served as a director of DexCom, Inc. (NASDAQ: DXCM), a provider of 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. 

David Berger
Executive Vice President and General Counsel
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.

John Cajigas
Executive Vice President and Chief Financial Officer

John Cajigas has served as our Chief Financial Officer since May 2008. Prior to joining our company, Mr. Cajigas served in various accounting and finance positions, most recently as Vice President, Finance, of Biosite from August 1995 until August 2007. Prior to joining Biosite, Mr. Cajigas worked as an Audit Manager with Ernst & Young LLP, working primarily with clients in the technology and biotechnology industries. Mr. Cajigas is a certified public accountant (inactive) and holds a B.S. in Business Administration (Accounting) from San Diego State University.

Brian Hansen
Executive Vice President and Chief Commercial Officer

Brian Hansen joined us as our Executive Vice President & 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 Fischer 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. 

Jim Leal
Vice President, Operations
Jim Leal joined Tandem in October 2010 as the Vice President of Operations, bringing 25 years of manufacturing and engineering experience. Previously, Jim 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
Chief Administrative Officer

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.

Mike Rosinko
Vice President, Technology and Innovation

Mike Rosinko joined Tandem in November of 2007 and has worked closely with the Company since its founding. In this role, he is responsible for project management, product development, engineering management, design controls and risk analysis. He has 25 years of experience in product development, including blood separation and processing systems, cardiovascular catheters, ultrasonic transducers, pacemakers, fiber optic systems, optical sensors and lasers. He has extensive experience in the development of complex control algorithms. Prior to joining Tandem, he held positions including Vice President of Engineering for CardioGenesis, Sr. Project Manager for The Aubrey Group, and R&D Project Manager for Biosense Webster. Mr. Rosinko holds a Masters of Business Administration from Claremont Graduate University, a MSEE from the University of Southern California, and a BSEE from University of Pittsburgh, where he graduated cum laude. In addition, he holds 10 patents in medical systems and devices.

John Sheridan
Executive Vice President and Chief Operating Officer

John Sheridan has 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.

Erik Verhoef
Vice President, Strategy

Erik Verhoef joined Tandem in September of 2007 and is responsible for strategic planning and the Company's market research and analytics. Prior to joining Tandem, he served as Director of Commercial Analysis at Biosite Incorporated. In addition, he worked in various brand marketing and analytics roles with GlaxoSmithKline and Bristol-Myers Squibb, helping launch such notable multi-billion dollar brands as Abilify, Wellbutrin XL, Boniva and Advair. Prior to his career in pharmaceutical marketing, he held equity research positions with William Blair & Company and Susquehanna Financial, where he was the lead analyst covering the pharmaceutical sector. He was a founding member of the Advisory Board's Implementation Center in Washington, D.C. and began his career as a healthcare consultant with Tiber Group in Chicago, IL. Mr. Verhoef holds a Masters of Business Administration in Finance and certificate in Health Services Management from Duke University and a BA in European History from Northwestern University, where he was a Clarence Dewitt Hardy Scholar. He is a member of the ADA.

Leigh Vosseller
Vice President, Finance

Leigh Vosseller has served as our VP of Finance since September 2013. Prior to joining Tandem, Leigh 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.