Clinical Advisory Board

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HeartStitch® works with a clinical advisory board made up of top physicians in their fields, with the knowledge and experience to successfully bring Prof. Nobles’ vision and HeartStitch®‘s devices through successful clinical trials.



Dr. William Cohn, Cardiovascular Surgeon–FACS, FACCP, FAHA

Director of Minimally Invasive Surgical Technology/ Associate Director, Laboratory Surgery Research – Center for Cardiac Support Texas Heart Institute, St. Luke’s Episcopal Hospital/ Associate Professor of Surgery, Baylor College of Medicine/ Adjunct Professor of Bioengineering, University of Houston.

Dr. Billy Cohn is a cardiovascular surgeon and the Director of Minimally Invasive Surgical Technology at the Texas Heart Institute at St. Luke’s Episcopal Hospital in Houston, Texas. He is the co-director of the Cullen Cardiovascular Research Laboratory and an Associate Professor of Surgery at Baylor College of Medicine and Adjunct Professor of Bioengineering at The University of Houston.

Dr. Cohn has published extensively in peer reviewed journals, has authored seven textbook chapters, and serves on the editorial board of the Heart Surgery Forum, Innovations, and CTS Net. He serves as an ad hoc reviewer for several medical journals including the Annals of Thoracic Surgery, the Journal of Thoracic and Cardiovascular Surgery and Circulation, and is on the Board of Directors of the International Society of Minimally Invasive Cardiac Surgery and the 21st Century Cardiac Surgical Society.



Dr. Crew

Dr. John R. Crew, Vascular Surgeon

Dr. Crew is a vascular surgeon, and has been a practicing physician in the San Francisco, California, area since 1964. Dr. Crew is currently serving as the Director of Cardiovascular Surgical Research for the San Francisco Heart Institute at Seton Medical Center in Daly City, California and as the Medical Director for the San Francisco Wound Care Center in Daly City, California.

Dr. Crew has done all major vascular surgical procedures, peripheral angioplasty, transmyocardial laser revascularization, made retractors in his garage, helped to develop numerous devices, products, procedures and techniques. He started a noninvasive vascular laboratory when everyone thought it foolish. He published the first paper on carotid surgery without angiography, considered unthinkable then but is now an acceptable way to proceed. He is constantly on the lookout for ways to improve patient care. He had a vision for a Wound Care Center and pushed to make it a reality. The clinic is now busy 5 days a week.

Dr. Crew is a member of the American Board of Surgery, American Board of Vascular Surgery, American Registry of Diagnostic Medical Sonographers, American College of Surgeons, Society for Vascular Surgery, Northern California Vascular Society, Society for Clinical Vascular Surgery, Society of Vascular Technology, and Honorary Member of the Wound Healing Society.




Dr. Michael Mullen, Interventional Cardiologist

Dr. Michael Mullen is Consultant Cardiologist at The Heart Hospital, University College London Hospitals where he established and leads the Structural Heart Intervention program.  Previously he was Consultant Interventional Cardiologist and Director of the cardiac catheter laboratories at the Royal Brompton Hospital and Harefield NHS Trust, and Honorary Senior Lecturer at Imperial College.

Dr. Mullen’s areas of expertise include structural heart intervention, valvular heart disease, adult congenital heart disease, and Marfan Syndrome. He has an extensive research portfolio and has been involved in the introduction of a number of new technologies including Transcatheter Aortic Valve Implantation (TAVI), Mitraclip and device closure of patent foramen ovale (PFO) and atrial septal defects (ASD).

Dr Mullen trained at the University of Newcastle-upon-Tyne before completing his cardiology training in Sheffield, London, and Toronto. He lectures widely at many national and international symposia and has over 50 publications in peer reviewed journals. He is a member of the British Medical Association, British Cardiac Intervention Society, British Congenital Cardiac Association, and the Royal College of Physicians of London.



jan warnke dr. photo

Dr. Jan Warnke, Neurosurgeon

Dr. Jan Warnke is currently Chief of Neurosurgery for The Paracelsus Clinic Group in Germany, and was appointed in 1993 at age 33. He is appointed Professor for “Medicine-Ethics-Finances” at the University Zwickau, Germany. He previously held a post as Professor for Neurosurgery at the Gutenberg University in Mainz, Germany.

After the Wall fell, Dr. Warnke developed the Paracelsus Clinic from a community hospital to a centre of excellence, from a medical standpoint but also from a financial perspective. Under his leadership, relationships with universities throughout Europe have increased, offering students the ability to practical medicine with state-of-the-art equipment.  As a result, Paracelsus has been vaulted to an internationally recognized standard for neurosurgery in Europe, and for rare diseases such as Leptomengeopathy and its variations, such as Perineural Spinal Cysts (Tarlov Cysts).

Prior to joining Paracelsus Private Hospital Group, Dr. Warnke was a practicing Neurosurgeon and Assistant Professor in Neurosurgery at RWTH Aachen Germany, Rheinisch-Westfälische Technische Hochschule. His education is truly international, including residencies in Germany, Hungary and Great Britain.


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