ION Intraoperative Neurophysiology was founded in 2012 by a group of highly experienced surgical neurophysiologists who are dedicated to providing the highest quality of patient care available.

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Jon Block DC, CNIM

Jon is an experienced clinical and surgical neurophysiologist. He received his doctorate in chiropractic in 1999 and his certification in clinical electrodiagnostics from the National University of Health Sciences in 2004. In 2005 he implemented the electrodiagnostic program at the Center for Neuro and Spine in Akron, Ohio, performing nerve conduction and needle EMG evaluations for the neurosurgery department. In 2007 he obtained his certification in neurophysiologic intraoperative monitoring (CNIM). For over a decade, he has worked as a surgical neurophysiologist covering orthopedic and neurosurgical procedures at multiple hospitals in the San Francisco Bay area.  Jon is an active volunteer for multiple non-profit medical organizations dedicated to improving the lives of children with complex spine deformities. He has volunteered on multiple pediatric medical missions to China, Columbia, the Dominican Republic, and Vietnam. In 2020 he became the CEO of Americare Neurosurgery International, a non-profit organization dedicated to improving surgical care in developing countries. Jon is also an active author, researcher, educator and consultant with multiple publications on the proper use of neuromonitoring to improve the safety of minimally invasive spine surgery. In 2018 he was granted a US patent on advanced methods for nerve mapping and monitoring with additional patents pending.

Bruce Bizzini, CNIM

Bruce is a highly skilled and experienced surgical neurophysiologist who has served the monitoring needs of Bay Area for almost 30 years. Bruce spent over a decade providing neuromonitoring for the neurosurgery program at the University of California San Francisco. For over 20 years, Bruce worked closely with some of the pioneers of surgical neurophysiology including John Gardi, PhD and Chuck Yingling, PhD.  Bruce was the former Vice President and Chief Operating Officer of California Neuromonitoring Services where he was responsible for clinical training and quality assurance. Bruce has monitored nearly 4000 surgeries including nearly 800 cerebellopontine angle tumor resections and over 500 neuromuscular scoliosis correction procedures. Bruce has been a valued member of our team since 2012.

Sarita Gupta, MD, CNIM, DABNM

Sarita is a highly experienced surgical neurophysiologist. Sarita obtained her M.B.B.S. (Bachelor of Medicine & Surgery) in 1991 at Indira Ghandi Medical College in Nagpur, India. In 1994 she obtained her M.S. (Masters in Surgery) specializing in Ophthalmology. From 1995-2008, Sarita practiced general medicine and Ophthalmology at the Khamlhat General Hospital and the Institute of Clinical Ophthalmology Gurunanak Hospital. In 2008 she moved to the US and obtained her ECFMG certification. In 2008 she contributed to research on artificial corneas at the Stanford Opthalmology Department and research on coronary angiogenesis at the Palo Alto VA Hospital Cardiology Department. In 2009 Sarita began her training in surgical neurophysiology. From 2010 through 2016 Sarita was a surgical neurophysiologist for the Stanford Neurosurgery Department. In 2015, she was awarded a Diplomate in Neurophysiologic Monitoring (DABNM) from the American Board of Neurophysiologic Monitoring. Sarita has been a valued member of our team since 2017.

Justin Silverstien, DHSC, CNIM, R.EPT, R.NCS.T, CNCT

Justin is considered a leader in the field of Intra-Operative Neurophysiological Monitoring and he is a frequent collaborator in ION’s clinical operations and research endeavors. He is a peer-reviewed published researcher, clinical practitioner, and educator. His graduate coursework focused in behavioral neuroscience, neurological deficits, clinical neurophysiology, and electrophysiology. He is currently the Director of Clinical Neurophysiology for Spine Medical Services, PLLC and was the Director of the Intraoperative Neurophysiological Monitoring Subsection in the Department of Orthopedics at North-Shore Huntington Hospital. Justin is a frequent lecturer at national and regional symposia for intra-operative Monitoring, as well as electroneurodiagnostics. He has also given numerous grand round lectures to hospital staff, medical students and residents. Currently, he is a Co-Chair for the IONM Interest Section for ASET and is also a peer reviewer for the American Journal of Electroneurodiagnostic Technology and the Neurodiagnostic Journal.

ION Intraoperative Neurophysiology
211 Crestview Drive
Orinda, CA 94563
Phone: (678)