By the early 1930s, Sullivan's alcoholism had completely consumed him. According to artist George Cannata, Sulivan would often fire employees in a drunken haze, not remembering the next day, when they would return to work as if nothing had happened. According to Shamus Culhane, Sullivan artist Al Eugster recalled that Sullivan was "he most consistent man in the business—consistent in that he was never sober". According to Otto Messmer, Sullivan drank all day long and was never in a sound enough state of mind to contribute creatively to the cartoons he produced. In later years, much of Sullivan's staff was interviewed and claimed Messmer deserved all credit for the Felix character's creation and development, arguing that Sullivan was too sick to contribute or even really run the studio.