In 1841 in London, England, Marriott was one of three board members of the Aerial Transit Company along with John Stringfellow and William Samuel Henson. Marriott was responsible for the illustrations and publicity campaign for their planned aerial steam carriage the "Ariel". The aircraft captured the imagination of the public and the company constructed and flew a small glider, but after a failure to build a larger working model and lacking funds, the company failed. Henson married and relocated to the United States, while Stringfellow continued aeronautical experiments. Marriott moved to California during the Gold Rush of 1849.