Leon, known to listeners as Etymoleon, has long held a fascination with the origins of words, an interest which led to the creation of Word History, a weekly fifteen-minute podcast devoted to the exploration of word origins. Each episode traces the etymology of words and names, while also drawing upon stories and events from the past to provide historical context. Leon later developed Derivety, a daily word game in which players test their knowledge of etymology by identifying a hidden word, guided by its origin and a carefully crafted clue, all under the pressure of a ticking clock. The name Etymoleon is a fusion of "etymology" and Leon’s own name.