Mark Tibbenham acquired GJD at the end of 2004. Gilbert and Jane Davies originally founded the company in 1983. It manufactures a complete range of passive infrared, microwave, and combined technology-based sensing devices. These are utilised in CCTV and illumination-related applications for the surveillance and intruder detection market. The company also manufactures a comprehensive range of specialised security products including a unique wireless system designed to protect church roofs and external platform areas. The company's success has been achieved on a foundation of in-house expertise, innovation, and customer service. Mark holds an honours degree in electronic engineering and is a registered Chartered Electrical Engineer. He was one of the BSIA committee members tasked with re-writing BS8418, subsequently released during 2010. He also contributes as a product expert on Cenelec TC 79/WG02.