Open Implants Team


Gregg M. Gellman

Chief Executive Officer

Gregg is a medical device executive and innovator with a proven track record in product development and commercialization. He has more than 15 years of experience, leading and growing biomedical companies.  Gellman’s previous experience includes executive leadership roles at EBI Biomet, now Zimmer Biomet, Greatbatch now Integer Holdings, EnerMed now Garwood Medical, StimMed and Thinking Robot Studios where he will continue to serve as a Board Member for both companies.  Gellman is a graduate of the State University of New York at Buffalo. He is certified in Quality Systems for Medical Devices (FDA’s QSR and ISO 13485) and in Global Product Submissions Directive Requirements (510(k), PMA, CE Mark).

Tamara Nazzal

Chief Growth Officer

Tamara is passionate about commercializing new technology.  Her experience includes launching new surgical devices, patient monitoring solutions and healthcare IT programs.  Previously, Tamara worked at Philips Healthcare, athenahealth, an innovation center at Partners Healthcare, and Covidien.  Tamara was a Fund Manager for Cornell’s Big Red Ventures, a seed stage venture capital fund.  In 2006, she became a founding Fellow of the Startup Leadership Program, now a global network with over 3,300 alumni. Tamara holds an MBA from Cornell University and a business degree in Operations Management from the University of Massachusetts Amherst.  She lives in the Boston area and enjoys photography, as well as jewelry making.

Glenn Kennedy

National Sales Manager

Glenn has served the dental laboratory industry for more than 10 years with an unwavering commitment to customer service.  His philosophy is that it is critical to say what you will do and then do what you say. This simple but often overlooked approach to customer service has served his customers well through the years.  With a background in Industrial Design, Glenn likes to study and understand problems before offering approaches that will result in beneficial outcomes for his customers.  Glenn enjoys technology and understands how the unique design features of Open Implants components can have a positive impact on the lab workflow and successful patient outcomes. In his off-time, Glenn enjoys mountain biking, reading, travel and trying new foods.

Rob Nazzal

Board Member, Open Implants | Former CEO & Co-Founder, CAP, acquired by Henry Schein

As a high-tech entrepreneur, Rob has commercialized several revolutionary technologies in various industries. Rob became involved with digital dentistry with Brontes technologies which developed an intraoral scanner, later acquired by 3M. Rob and his team developed the digital workflow to enable dental laboratories to produce restorations from the scanner. In 2010, Rob cofounded CAP, which provides digital manufacturing solutions to dental laboratories. CAP became part of Henry Schein / Zahn Dental in 2016. Rob is currently in the process of starting up a software company in the analytics space. He also serves on the board of directors of Lantos Technologies, an ear scanning company for producing custom fit hearing aids and consumer audio products.

Rob has a degree in Computer Science from Cornell University and has an extensive background in creating and commercializing new technologies in several industries including supply chain, residential services, network security and the dental industry.

Bob Cohen, CDT

Board Member, Open Implants | Former President & Co-Founder, CAP, acquired by Henry Schein

Bob Cohen, CDT has been actively involved in dentistry for many decades. In 1983, Bob co-founded a dental lab in Massachusetts, Advanced Dental Technologies (ADT), which he co-owned for 34 years.  Today, ADT is which is best known today for implant supported restorations and esthetic dentistry. In 2010, Bob cofounded Custom Automated Prosthetics (CAP), which provides digital manufacturing solutions to dental laboratories. CAP provides advanced digital training and support, software solutions, automated implant solutions, CAD/CAM equipment and proprietary digital software solutions.  CAP became part of Henry Schein / Zahn Dental in 2016.   

Bob is passionate about training which he did extensively through CAP Academy and videos.  Bob has published several articles on clinical and technical aspects of dentistry, as well as having lectured internationally on many dental and technical related topics. Along with his diversified expert team, Bob has been a beta provider for multiple dental companies and has been involved in product development for decades.

Frederic Rapp

Co-Founder & Board Member

Frederic Rapp is dedicated to bringing innovation to the dental industry.  He graduated with a degree in mechanical engineering in 2003. Two years later, he took over his father’s two man dental lab in France. He has grown the lab to be the third largest in France with 80 people on staff.  The lab, CrownCeram is one of the most automated labs in France and is likely one of the most lean operations found anywhere. In 2009, Frederic invested in CAD CAM and has been in the forefront of this technology ever since. In 2013 he began selling IOS devices into dentists offices in both Switzerland and France. Today Frederic enjoys a balance of family, work and travel.

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