Dr Cullimore has been actively involved in many varied consulting projects in the past, setting up his first consulting company Crushproof Software in 1985.

• Symbian
• Kenyon & Kenyon
• NEC
• Psion
• Intel
• Fujitsu
• Xircom
• Databook
• MCCI
• Two Way TV
• Psion Dacom
• Pathlight

• Operating Systems (Windows, Win32, WinCE, Palm OS, EPOC, Symbian, device drivers, ROM BIOS)
• Applications (Windows, Mac, Linux)
• Communications (Serial RS-232, TCP/IP, Infra Red, Bluetooth, USB)
• Hardware and Firmware
• Business Development and Markets

Also Dr Cullimore was an Expert Witness at an Old Bailey trial in London, for the Crown Prosecution, in 1986 at what was then the country's largest drugs-bust case.

He was also an Expert Witness for Hewlett-Packard, represented by top law firm Kenyon & Kenyon, in 2005 for a patent infringement case.