Meet our Management Team.

  • Team member
  • Team member
  • Team member
  • Team member
  • Team member
  • Team member

Frans Cromme


Frans is a senior commercial executive with 20+ years of experience in the diagnostic, pharmaceutical and medical devices industry. He has had leadership roles in sales, general management, marketing and R&D, and has lived and worked in various countries in Europe and Latin America. Frans has a Masters degree in Molecular Biology and a PhD in Oncology.

Click here to get in touch with Frans.

Jorrit Kelderman


Jorrit is an experienced Chief Financial Officer with a demonstrated history of working in the medtech device industry. He holds an Executive Master in Finance & Control (RC) from Nyenrode Business University and a Master in Economics from VU University. With his in-depth experience in acquisitions, post-merger integration, financing and performance management, Jorrit brings significant international experience from the US, the UK and Japan to the management team at ViCentra.

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Sarah Lee

HR Manager

Travel lover Sarah graduated from Northumbria University with a 2:1 Honours degree in Law, a four year programme which integrated the LPC and gave her a practical and knowledgeable basis for her future in HR. Following her studies, Sarah joined the graduate trainee programme at Hays, the world’s leading specialist recruitment agency, where her performance quickly placed her in the top 10% of the UK division and led to fast track promotions. Following a spell in London where she joined a recruitment consultancy as Team Manager before being promoted to Business & Recruitment Manager, Sarah relocated to the Netherlands, working as a freelance HR consultant across a range of sectors and completing her Master’s degree in Global Human Resource Management. Sarah has a keen interest in people-centred management and was drawn to ViCentra by the opportunity to be involved in HR at an early stage. Now responsible for all aspects of our HR, including recruitment, Sarah is always on the lookout for innovative, talented and fun people to join the ViCentra family.

Click here to get in touch with Sarah.

Michael Graves


Michael has spent his entire career in medical devices and pharma and brings more than 20 years operational experience to ViCentra. Michael has led both large operations and small start-ups, ranging from prefilled insulin syringes, insulin pumps, wound care, disposable hospital equipment, ECG monitors and permanent skin fillers. Having worked with diabetes for more than 14 years, 10 of which were spent with Novo Nordisk, Michael brings diabetes business understanding to ViCentra.

Click here to get in touch with Michael.

Tim Oakes

Tim Oakes

CTO and Co-Founder

From a young age, Tim could usually be found surrounded by tools and prototypes, building his own boats and rigging elaborate zip lines in his garden. Now an award-winning design engineer, Tim has over seven years’ experience in the medical device field, working on projects as diverse as drug delivery platforms to laparoscopic surgical instruments. Having grown up with a father with Type 1 diabetes, Tim has first-hand knowledge of the challenges of trying to incorporate complex medical devices into daily life and is driven by a deep desire to create products that help make life easier.

Click here to get in touch with Tim.

Stuart Welland


Stuart has 24 years’ experience in the medical device industry holding senior Commercial leadership positions across multiple geographies. This includes 17 years at Medtronic where he led Sales, Marketing and Customer Care teams in their Cardiac Surgery and Diabetes divisions. Stuart brings significant experience in setting strategic vision, maximizing growth of innovative technologies and developing high performing teams including distributor management. Stuart holds a Bachelor’s degree in International Business & French from Aston University, England & Ecole Superieure de Commerce, Bordeaux.

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Michael Webb

Vice President of Manufacturing

With Michael Webb joining ViCentra, the company gained an engaged leader with 15+ years Class III medical device experience from advanced product development to commercialization. His experience ranges from working with small individual contributors to multidisciplinary engineering teams as well as scaling operations from R&D to commercial manufacturing platforms, in start-up business to most recently as Director of Engineering at Medtronic.

At ViCentra, Michael greatly strengthens the leadership team with his proven track record as a dynamic manufacturing and technical operations leader, adept in Manufacturing, Engineering, Quality, Business Development and Strategy Execution.

Click here to get in touch with Michael.

John Tullett

Director of QA/RA

After starting his career in R&D, John soon saw the light and began his move into Quality and Regulatory in the late 1980s, just in time for the introduction of the PPE and medical devices directives. Over the course of his 30 year career, sci-fi fan John has worked with medical devices ranging from Class I through to Class III, as well as secondary packaging for drugs manufacture. During this time, he’s dealt with most of the global markets and acted as the point of contact for the FDA and other notified bodies too. Prior to joining ViCentra, John spent twenty years at SSL International, eight at Smiths Medical and five years at Cogent Healthcare Systems. His expert knowledge of radio and telecoms requirements has been particularly useful in his work at ViCentra, where he is responsible for managing our Quality management systems and ensuring our compliance with the requirements of ISO 13485. Despite once swearing he’d never again join a start-up, John secretly enjoys the challenge of setting up systems and taking new products through the accreditation process. John says ViCentra’s relaxed atmosphere also resonates well with him – that and the fact that, here, our individuals really do change the way we do things.

Click here to get in touch with John.