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Management Team

John H. Stevens, M.D.

President, Chief Executive Officer, and Member of the Board of Directors

John H. Stevens, M.D.

President, Chief Executive Officer, and Member of the Board of Directors

Dr. John H. Stevens joined HeartFlow in 2010. He has had a distinguished career as a healthcare professional, and possesses extensive experience in founding and leading technology-focused companies. He was the co-founder and chief technology officer of Heartport; co-founder and executive chairman of Amp Resources; and, co-founder, chairman and chief executive officer of Sundrop Fuels.

Previously, Dr. Stevens was an adult and pediatric cardiac surgeon at Stanford University Hospital and Lucile Salter Packard Children’s Hospital in Stanford, Calif. He received his post-graduate training at Stanford University and The Great Ormond Street Hospital for Sick Children in London, England.

Dr. Stevens currently serves on the boards of directors of HeartFlow, Apnicure, Clene Nanomedicine and KaeMe.org, of which he is also the co-founder and executive director. He is also the managing partner of Headwaters Capital Partners.

He received his B.S. from the University of Utah and M.D. from the Stanford University School of Medicine, where he was also an assistant professor of cardiovascular surgery.

Campbell Rogers, M.D., F.A.C.C.

Executive Vice President and Chief Medical Officer

Campbell Rogers, M.D., F.A.C.C.

Executive Vice President and Chief Medical Officer

Dr. Rogers brings a wealth of experience to HeartFlow, where he serves as the Chief Medical Officer. Prior to joining HeartFlow, he was the Chief Scientific Officer and Global Head of Research and Development at Cordis Corporation, Johnson & Johnson, where he was responsible for leading investments and research in cardiovascular devices. Prior to Cordis, he was Associate Professor of Medicine at Harvard Medical School and the Harvard-M.I.T. Division of Health Sciences and Technology, and Director of the Cardiac Catheterization and Experimental Cardiovascular Interventional Laboratories at Brigham and Women’s Hospital. He served as Principal Investigator for numerous interventional cardiology device, diagnostic, and pharmacology trials, is the author of numerous journal articles, chapters, and books in the area of coronary artery and other cardiovascular diseases, and was the recipient of research grant awards from the NIH and AHA.

He received his A.B. from Harvard College and his M.D. from Harvard Medical School.

Charles A. Taylor, Ph.D.

Founder, Chief Technology Officer, and Member of the Board of Directors

Charles A. Taylor, Ph.D.

Founder, Chief Technology Officer, and Member of the Board of Directors

Dr. Taylor is a co-founder, Chief Technology Officer (CTO), and member of the Board of Directors of HeartFlow Inc. Previously, he was an Associate Professor in the Departments of Bioengineering and Surgery at Stanford University with courtesy faculty appointments in the Departments of Mechanical Engineering and Radiology. He is also currently a Consulting Professor of Bioengineering at Stanford University and a Part-time Professor of Biomedical Engineering at the Technical University of Eindhoven. He is internationally recognized for his pioneering work in combining computer simulation methods with medical imaging data for patient-specific modeling of blood flow to aid in the diagnosis and treatment of cardiovascular disease. Dr. Taylor has published over 350 peer-reviewed journal and conference papers and has over 220 issued or pending patents worldwide.

He received his B.S. degree in Mechanical Engineering, M.S. degree in Mechanical Engineering and M.S. degree in Mathematics from Rensselaer Polytechnic Institute and a Ph.D. in Mechanical Engineering from Stanford University.

Michael Buck

Executive Vice President and Chief Commercial Officer

Michael Buck

Executive Vice President and Chief Commercial Officer

Mr. Buck is an experienced healthcare leader with over 25 years of operational experience in various functional roles such as global business and product development, licensing and acquisitions, venture investment and commercial sales management. At HeartFlow, he is responsible for expanding and accelerating global market adoption of the company’s HeartFlow® FFRCT Analysis. Prior to HeartFlow, Mr. Buck was president of the medical products division for Cardinal Health, with global responsibility for the Cardinal brand product portfolio. Prior to Cardinal Health, he held several senior leadership roles at Abbott Laboratories, including vice president of global market development, vice president of licensing and acquisitions, and vice president of venture investing. Previously, he held commercial leadership positions at Novoste Corporation, Boston Scientific and Smith & Nephew.

Mr. Buck earned a B.A. degree in economics from the University of Iowa and currently serves on the board of directors of Cibiem, Inc.

Noemi C. (”Nicky”) Espinosa, J.D.

General Counsel

Noemi C. (”Nicky”) Espinosa, J.D.

General Counsel

Ms. Espinosa served as vice president of legal operations and assistant general counsel for Intuitive Surgical in Sunnyvale, Calif. She also served as the vice president of intellectual property for Illumina, Inc., in San Diego. Espinosa also spent more than 20 years in private practice as a litigation partner in the Silicon Valley offices of three major national law firms: Brobeck, Phleger & Harrison LLP, Dewey Ballantine LLP, and Dechert LLP. While in private practice, she advised and represented a variety of emerging growth and publicly held life science and technology companies.

She received her Bachelor of Science degree in chemical engineering from San Jose State University, and a juris doctorate degree from the University of California, Hastings College of the Law.

Baird Radford

Chief Financial Officer

Baird Radford

Chief Financial Officer

Mr. Radford has over 20 years of finance experience in Silicon Valley and serves as the Chief Financial Officer at HeartFlow. Prior to joining HeartFlow, Mr. Radford was Vice President of Finance at Intuitive Surgical, Inc. with responsibility for financial planning & analysis, investor relations and enterprise analytics. Prior to joining Intuitive Surgical, Mr. Radford held various positions at eBay Inc. including Vice President of Finance for Marketplaces Europe and Vice President Corporate Controller & Chief Accounting Officer. Mr. Radford also worked in the audit practice of PricewaterhouseCoopers LLP for almost nine years.

Mr. Radford received his B.B.A. from Ohio University.

Yoshiki Kawabata

President of HeartFlow Japan G.K.

Yoshiki Kawabata

President of HeartFlow Japan G.K.

Mr. Kawabata has over 25 years of experience in variety of medical device businesses such as Surgical Staplers, Endoscopic Devices, Electrophysiology Ablation products, Cardiac Intervention Catheters, FFR / OCT devices, In Vitro Diagnostics products, and others. Started as a sales representative in Tokyo, Japan, he took multiple responsibilities in sales, marketing, business development, R&D, and franchise management at Johnson & Johnson Medical in Japan. Throughout his career, he has been bridging Japan and US successfully to meet customer needs and seeking higher business achievements.

He received his B. S. degree in Law from Rikkyo University in Japan.

Christopher K. Zarins, M.D.

Founder, Senior Vice President of Medical Affairs, Member of the Board of Directors

Christopher K. Zarins, M.D.

Founder, Senior Vice President of Medical Affairs, Member of the Board of Directors

Dr. Zarins is a co-founder, Senior Vice President of Medical Affairs, and member of the Board of Directors of HeartFlow Inc. He served as the Chief of Vascular Surgery at the University of Chicago from 1978-1993. In 1993 he joined Stanford University as the Walter Clifford and Elsa Rooney Chidester Professor in Surgery and served as the Chief of Vascular Surgery at the Stanford University Medical Center from 1993-2005. Dr. Zarins served as President of the Society of Vascular Surgery in 1999.

He received his B.A. from Lehigh University and M.D. from Johns Hopkins University School of Medicine.

Heather A. Brown, Ph.D.

Senior Vice President of Growth Operations

Heather A. Brown, Ph.D.

Senior Vice President of Growth Operations

Dr. Brown brings 10 years of experience in advanced medical imaging product development and service. She has held leadership roles in multiple startups and drove the development of AAA stent graft and TAVR planning applications as well as novel methods of assessing cardiac wall mechanics. Dr. Brown developed the first Volumetric Medical Imaging college accredited program at Jefferson Community and Technical College in 2005. She holds six patents.

She received her B.S. degree in Mechanical Engineering from Michigan Technological University, and M.S. and Ph.D. degrees in Biomedical Engineering from Vanderbilt University.

Leo Grady, Ph.D.

Senior Vice President of Engineering

Leo Grady, Ph.D.

Senior Vice President of Engineering

Dr. Grady has over 12 years of experience in creating advanced medical imaging and machine learning-based software. Prior to joining HeartFlow, he worked at Siemens in the Corporate Research division focused on developing software for advanced imaging analytics and computer vision. In this role he created and led the development of innovative software products to extract complex information from a wide variety of medical imaging modalities, with a particular focus on cardiovascular and oncology applications. He is internationally recognized for his work on advanced algorithms for medical imaging, computer vision and machine learning. Dr. Grady has published two books, over 100 peer-reviewed journal and conference papers and has over 300 issued or pending patents worldwide.

He received a B.S. degree in Electrical Engineering at the University of Vermont and a Ph.D. in Cognitive and Neural Systems from Boston University.

Rob Eno

Senior Vice President of Marketing

Rob Eno

Senior Vice President of Marketing

Mr. Eno has 20 years of experience in bringing disruptive medical technologies to market. Prior to joining HeartFlow, he was the Vice President of Marketing and International Sales at OptiMedica, which was acquired by Abbott. Previously, he served as Vice President of Marketing at NeoGuide Systems (acquired by Intuitive Surgical) and as Vice President of Sales and Marketing at Avantec Vascular (acquired by Goodman Co. Ltd). He also held several marketing and strategic planning positions in Guidant’s Vascular Intervention division.

He received his M.B.A. degree from Stanford’s Graduate School of Business and his A.B. in Economics and American Studies from Stanford University, where he was Phi Beta Kappa.

Renata Naoumov

Head of People Operations

Renata Naoumov

Head of People Operations

Renata brings over 15 years of experience at Fortune 50 and start-up organizations in technology, financial services, banking and manufacturing. Prior to joining HeartFlow, Renata was Vice President of Human Resources at Merchant e-Solutions, a Cielo Company. Previously, Renata worked for global organizations such as The Dow Chemical Company, General Electric and HSBC.

Renata has a Master of Science in Human Resources Management from Purdue University’s Krannert School of Management and a Business Administration degree from Fundacao Universidade Federal do Rio Grande. Renata is also a Certified Compensation Professional (CCP) from WorldatWork.