Our Team

The management team at Vigilant Diagnostics has decades of experience in the medical technology and diagnostics industries, and in managing startup and emerging growth companies. Together, they share a vision to improve healthcare through faster and more accurate diagnoses of infectious diseases globally, while reducing the economic and cultural burden of such diseases on society.


John C. Bischof, Ph.D. – Board Member & Cofounder
Dr. Bischof has been the principal investigator of Vigilant Diagnostics since he cofounded the firm in 2014. He is the Distinguished McKnight Professor of Mechanical and Biomedical Engineering at the University of Minnesota, and is also the Medtronic-Bakken Endowed Chair for Engineering in Medicine, Mechanical Engineering. In 2018, he was appointed Director of the University’s Institute for Engineering in Medicine, which is dedicated to advancing healthcare by strengthening research collaborations between engineering and medicine in both academia and industry. Dr. Bischof works in the area of thermal bioengineering with a focus on biopreservation, thermal therapy, and nanomedicine. In addition to his University appointments, he is also Director of the NSF Engineering Research Center Advanced Technologies for Preservation of Biological Systems (ATP-Bio), which launched in 2020. He has been cited more than 15,000 times and has authored 250+ papers.


Mark Stockhowe – CEO
Mark W. Stockhowe is an experienced leader with a notable track record in the healthcare and technology sectors. His strategic foresight and operational expertise were honed as an executive at OPTUM, where he led significant cost-reduction initiatives and spearheaded major projects, driving growth and innovation. Mark's entrepreneurial spirit shone through as he transitioned Aztecha and Agiliti from startups to commercial success stories. Holding an MBA from Bethel University, his leadership is marked by a commitment to excellence and a deep understanding of technology's role in healthcare improvement. At Vigilant Diagnostics, Mark is focused on propelling the company to the forefront of diagnostic innovation, improving patient care through cutting-edge solutions.

Tomo Sato, CTO

Tomokazu Sato, Ph.D. – Chief Technical Officer
After Dr. Sato earned his Ph.D. in Biophysics from Harvard, he joined an early-stage biomedical firm as Senior Research Scientist and Platform Engineer, where he was key in developing core IP for the company. Following that, he returned to academia as a postdoctoral fellow in Biology and Bioengineering at Caltech. He then joined an engineering consulting firm in Minnesota, where he performed engineering, science, and technology development work for Vigilant Diagnostics, before joining the company as its Chief Technical Officer (CTO). His research work has included basic science and pre-clinical work, both with animals and humans.


James Sackrison – Chief Scientific Officer
Jim is a clinical chemistry pioneer and key opinion leader in the in vitro diagnostic space, including 15 years at Beckman Coulter (a Danaher Company), a leading global diagnostics firm, and more recently as an independent consultant. At Beckman Coulter, he served as Principal Scientist and was a five-time winner of the company’s Excellence in Innovation Award. Jim has had more than 50 diagnostic assays approved through the FDA, and has been highly successful at transforming multiple technical opportunities into cost-effective business solutions. He enjoys bringing together diverse stakeholders to build sustainable solutions for new and challenging issues.

Dan Chen, Advisor

Dan Chen, Ph.D. – Board Chairman
Dan is a former Division President at 3M. His 30+ years of professional experience includes roles in business management, strategy, M&A, and product commercialization. Dan is the sole or co-inventor on eleven filed or issued patents, including the largest unit-volume disposable respirator design on the market globally. He has also led two major $2B+ acquisition projects, and investments with four startup companies. Dan is also on the board of Frontline Road Safety Group, owned by The Sterling Group, and Sustainable Resources Center, a non-profit based in Minneapolis. He earned his B.S from Stanford University, his Ph.D. in Chemical Engineering from the University of Wisconsin, and an Executive MBA from INSEAD in France. He is also a registered Professional Engineer in the State of Minnesota.


Frank F. Jiang, M.D., Ph.D. – Advisor
Dr. Jiang has 25 years of experience heading various medical technology firms. He has served on advisory boards for multinational medical device corporations and PE firms, including Medtronic, Johnson & Johnson, Bain Capital, CETIC Capital, and many developing medtech companies. He has also been a thoracic surgeon for 12 years. In addition, he has served as Executive Chairman and CEO of China Association for Medical Devices Industry (CAMDI). His experience includes establishing the largest medical device distribution system in China, which had annual sales of more than $200M USD. Dr. Jiang has founded nine device/pharma companies that exited through acquisition. He has offices in NY, Beijing, and Amsterdam.

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