Geoff Varrall joined RTT in 1985 as an executive director and shareholder to develop RTT's international business as a provider of technology and business services to the wireless industry. He co-developed RTT's original series of design and facilitation workshops including RF Technology, Data Over Radio, Introduction to Mobile Radio, and Private Mobile Radio Systems. He also developed The Oxford Programme, a five day strategic technology and market program presented annually with the Shosteck Group. Over the past twenty years, several thousand senior level delegates have attended these programs. As a Director of Cambridge Wireless, Geoff is involved in a number of wireless heritage initiatives that aim to capture and record past technology and engineering experiences. Roger Belcher is cofounder and Director of RTT Programmes Limited. He develops and presents design programs targeted to the worldwide manufacturing and network operator community. He has coauthored two engineering-level foundational books for what has become the modern wireless industry.