William "Billy" Jensen Cottrell (born 1980, 28 years old) is a former Ph.D. candidate at the California Institute of Technology who was convicted in April 2005 of conspiracy to arson of 8 sport utility vehicles and a Hummer dealership in the name of the Earth Liberation Front (ELF). He was sentenced to eight years in jail on terrorism charges and ordered to pay $3.5 million in restitution. His lawyers however have launched an appeal on it. He will be released in 2013.