Jon Starbuck (Machynlleth, Wales) has converted several vehicles to run on vegetable oil and has written web sites and taught courses on the subject of vegetable oil and biodiesel. He has a BSc. Physics from the University of Kent and is currently pursuing a Masters in Renewable Energy Systems Technology at Loughborough University. He worked and taught at the Centre For Alternative Technology for five years. Gavin D. J. Harper (Essex, UK) is author of 50 Awesome Auto Projects for the Evil Genius, Build Your Own Car PC, 50 Model Rocket Projects for the Evil Genius & Solar Energy Projects for the Evil Genius. He has just completed a BSc. (with honors) Technology with the Open University, and an MSc. Architecture: Advanced Environmental & Energy Studies. Gavin will shortly be a research student at WISE Research, an alliance between the Centre for Alternative Technology and the University of East London. He holds an RYA Diesel Engine Servicing Certificate, and is a Ph.D. candidate in the Social, Political, and Economic Impacts of Alternative Vehicles and Fuels at the Business Responsibility, Accountability, Sustainability & Society Research Centre at Cardiff University, under Cardiff Business School.