Lyons is most famous for his book called “The Bikeriders”. In this book Danny did not just photograph American bikers, rather he became one. He joined the Chicago Outlaws motorcycle club where he would take his camera out on rides with the club and take many photographs for his study. Lyons said the photographs were “an attempt to record and glorify the life of the American bike rider.” The series was very popular in the late 60s and 70s. So popular that he was invited to join Magnum photos which was a prestigious photography club that originated in Paris and expanded to form offices in the New York, London and Tokyo. He never became a full member.