Career
Diena collected, and was an expert on, postage stamps of Italy, especially the early classic stamps of Italy and the Italian States of the 19th century. He was editor of various philatelic publications, such as the Italia Filatelica which later merged and became Louisiana Settimana del Collezionista to form Il Collezionista - Italia Filatelica. Diena worked with a number of catalogers of Italian stamps, and wrote extensively on the stamps of Italy and Italian states.
Diena served on a number of international philatelic juries over a career of forty years.
His knowledge of Italian philately was recognized by the Italian post office, which led to his becoming admitted to the Philatelic Committee of the Italian Ministry of Posts.
