Alan Lock is a former Royal Navy Officer. In late 2003 Alan began to suffer from Macular Degeneration which rapidly destroyed much of his vision and cost him his military career. Despite this, Alan has completed 10 marathons including the 151 mile Marathon Des Sables in the Sahara Desert. In 2008, Alan set a Guinness World Record and raised over $80,000 for charity when he became the first visually impaired person to row across the Atlantic Ocean.