A History of Innovation

SINTX Technologies was founded as Amedica Corporation by a material scientist and orthopedic surgeon. Together, they developed advanced ceramics for use in the human body. Since 1996, we’ve found similar innovative uses for silicon nitride, with applications ranging from biomedical to industrial.


B. Sonny Bal, MD, JD, MBA, PhD

Chairman of the Board, Chief Executive Officer, President & Principal Financial Officer

Dr. Sonny Bal has served on the Board of Directors of SINTX Technologies since February 2012, and as Chairman of the Board since August 2014. In October 2014, he was appointed the CEO & President of SINTX Technologies.

Dr. Bal previously served as Professor of Orthopaedic Surgery and Adjunct Professor of Material Sciences at the University of Missouri. He has >20 years of clinical experience as an orthopaedic surgeon and attorney, and is affiliated with several professional organizations. In addition to serving on the editorial boards of peer-refereed journals, Dr. Bal has researched and published extensively in ceramic science, and continues that work.

Dr. Bal holds an M.D. from Cornell University, an M.B.A. from Northwestern University, a J.D. from the University of Missouri and a Ph.D in Materials Engineering from the Kyoto Institute of Technology.

Bryan J. McEntire, MBA, PhD

Chief Scientific Officer

Dr. McEntire has more than 30 years of experience in advanced ceramic product development, quality engineering, and manufacturing. Prior to joining SINTX, Dr. McEntire held various senior roles in notable ceramics and materials companies, including Applied Materials, Saint-Gobain Industrial Ceramics Corporation, and Ceramatec.

He is an author or co-author of over 45 technical papers on ceramic materials, processing, and characterization, and served as an invited short-course lecturer on Forming of Ceramics at the Annual Meeting of the American Ceramic Society from 1986 to 1995. He was elected a Fellow of the American Ceramic Society in 2012.

Dr. McEntire holds B.S. in Materials Science and Engineering and an M.B.A. in Operations Management, both from the University of Utah, and a Ph.D. in Biomaterials Engineering from the Kyoto Institute of Technology.

David O’Brien

Chief Operating Officer

Mr. O’Brien previously served as the Company’s Vice President and General Manager from October 2016 to July 2019. From March 2014 through September 2016, he was SINTX Technologies’ Vice President of Operations and Vice President of Manufacturing.

Mr. O’Brien has over 30 years of experience in engineering, manufacturing, and operations leadership in advanced materials and medical device organizations. From 2005 to 2014, he fulfilled several engineering leadership roles for Covidien including Manufacturing Engineering Manager for the Norfolk, Nebraska facility. From 1991 to 2005, he worked for Arnold Magnetic Technologies in the production of ceramic, powder metal, and molded magnets in multiple facilities across the U.S. and in England.

He has extensive experience with Lean and other Continuous Improvement initiatives. Mr. O’Brien holds an M.S. in Ceramic Engineering from the Georgia Institute of Technology and a B.S. in Physics from the University of Texas at San Antonio.

Donald J. Bray

Vice President of Business Development (Armor and Industrial Markets))

Mr. Bray has more than 30 years of experience in the technology and business of advanced ceramics. Prior to joining SINTX, Mr. Bray held various senior roles in notable ceramics and materials companies, including Alcoa, Advanced Refractory Technologies, Poco Graphite, and Morgan Advanced Materials.

Mr. Bray holds B.S. and M.S. degrees in Materials Science and Engineering from Iowa State University, and an EMBA from the University of Texas – Dallas.
Michael Marcroft

Michael Marcroft

Vice President of Business Development (Medical Technology Market)

Mr. Marcroft will lead business development initiatives within the medical device sector. With nearly two decades of experience in medical technology business development & marketing, Mr. Marcroft has previously held positions at 3M, Medtronic, and Boston Scientific. He most recently served as Vice President of Marketing at Vision Source, where he led several key initiatives.

Joseph Palomo

Vice President of Business Development (Antipathogenic Market)

Mr. Palomo has more than 40 years of medical device development and manufacturing experience in protective apparel and other medical products: surgical gowns, surgical drapes, isolation gowns, films, tubing and medical face masks. Instrumental in development of performance standards for medical devices in ASTM and AAMI. Has held management roles in Cardinal Health R&D for new product development on a global scale with Latin America and Asia.

He holds a BS degree in Mechanical Engineering from Illinois Institute of Technology.
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