Many strips were the work of two people although only one signature was displayed. Shortly after Frank Willard began "Moon Mullins" in 1923, he hired Ferd Johnson as his assistant. For decades, Johnson received no credit. Willard and Johnson traveled about Florida, Maine, Los Angeles, and Mexico, drawing the strip while living in hotels, apartments and farmhouses. At its peak of popularity during the 1940s and 1950s, the strip ran in 350 newspapers. According to Johnson, he had been doing the strip solo for at least a decade before Willard's death in 1958: "They put my name on it then. I had been doing it about 10 years before that because Willard had heart attacks and strokes and all that stuff. The minute my name went on that thing and his name went off, 25 papers dropped the strip. That shows you that, although I had been doing it ten years, the name means a lot."