Lawrence Howland Knox (September 30, 1906 – January 6, 1966) was born in New Bedford, Massachusetts and died of carbon monoxide poisoning at Colegio Vista Hermosa, Mexico City. He was among the first African-Americans to receive a PhD in chemistry, following his eldest brother William Jacob Knox Jr. (1904–1995). Both brothers were among the African American scientists and technicians on the Manhattan Project. Lawrence worked with Paul Doughty Bartlett on an experiment for testing organic mechanisms in chemistry which involved the use of the molecule bicyclo(2.2.1)heptane, a type of bicyclic molecule. Additionally, Lawrence made significant contributions such as publishing papers about aromatic hydrocarbon molecules and proved Erick Hückel's theory about aromatic hydrocarbons correct.