Board of Directors

Bernard Herman van Bilderbeek

BSc M.Eng

Chief Executive


Ben founded the Plexus business in 1986. He has more than 35 years’ experience in the industry in both engineering and management roles and previously held senior positions with Vetco Offshore Industries, Dril-Quip, and Ingram Cactus. Following a career at Vetco, where Ben rose to the position of General Manager of UK Engineering, he went on to found his own oil and gas consultancy, VBC Consultants, in 1982. During this time, his clients included Amoco, Marathon Oil, FMC Corporation and Dril-Quip. In 1986, Ben founded Plexus and went on to merge the wellhead division of his company with Ingram Cactus where he became President Eastern Hemisphere. In 1996 Ben regained the Plexus Ocean Systems Limited name through which POS-GRIP technology was invented and then developed and commercialised for the oil services wellhead equipment market.

Graham Paul Stevens

BA (Hons)

Finance Director


Graham has broad experience in financial, corporate, and operational management within both public and private companies including J Sainsbury plc, BSM Group Limited, Sketchley Group plc, and Fii Group plc. He has been involved in a range of industries as a director, investor, and advisor, and overseen a number of acquisitions and disposals, as well as the implementation of turn around and growth strategies. Graham is a non-executive director of Netplay TV PLC, the AIM listed largest UK interactive TV gaming company. He was previously a non-executive director of NRX Global Inc. the worldwide leader in Asset Information Management solutions used by leading companies in asset intensive industries, including oil and gas.

Craig Francis Bryce Hendrie

M.Eng (Oxon)

Technical Director


After gaining a Masters Degree in Engineering Science from the University of Oxford, Craig began his career with ICI plc in 1996 as a machines engineer. He joined Plexus in 1998 and was instrumental in the development, testing and analysis of the original POS-GRIP products. As Technical Director, Craig is responsible for overseeing new technology and concept development, product testing and analysis.

Jerome Jeffrey Thrall*

BBA MBA *Member of Audit and Remuneration Committees

Non-Executive Chairman


Jeff joined Thrall Enterprises, Inc. (‘TEI’), a family owned holding company headquartered in Chicago, USA, in 1980 as vice president of corporate development of TEI’s subsidiary, Nazdar Company, a manufacturer and distributor of screen printing and digital inks and supplies. Jeff was named President of TEI in 1995. Jeff is also Managing Director of GSI Technologies, a printer of functional electronic products and industrial graphics. Prior to joining TEI, Jeff’s professional career included a number of appointments in investment banking, commercial lending and administration.

Charles Edward Jones*

BSc M.Eng *Member of Audit and Remuneration Committees

Non-Executive Director


Charles has over 30 years of senior management and Board experience in the energy sector. In 2007, Charles was CEO of Houston-based Forum Oilfield Technology, a global oilfield products company which he successfully merged with three other companies in 2010 to create Forum Energy Technologies (NYSE: FET) and where he remained as President until 2013. Prior to Forum, Charles was COO of privately owned Hydril Company LP, where he played a leading role in the US based drilling and downhole products company’s IPO in 2000 and subsequent sale for US$2.1 billion. Before joining Hydril, Charles served as Director of Subsea Businesses for Cooper Cameron Corporation where he developed the global subsea production business.

Ms Kunming Liu


Non-Executive Director


Kunming has over 18 years’ experience in corporate finance and financial accounting. She currently holds the position of Vice President and Chief Administrator of HITIC Energy, an emerging oil and gas development company based in Canada, which is a subsidiary of Jereh Oilfield Services Group, a multi-billion dollar Chinese oil services provider and a Plexus licencee. Prior to this, Ms Liu was the Financial Director of Jereh Energy Services Corporation, a wholly owned subsidiary of Jereh. Additionally Ms Liu holds a major in financial accounting from Shandong Cadres Institute of Economics and Management in China.