Noted American animator, renowned for his significant contributions to the renowned Felix the Cat cartoons and comic strip, a creation of the esteemed Pat Sullivan studio.
The extent to which Messmer's creative endeavors played a pivotal role in the conception and widespread acclaim of Felix is a topic of ongoing scholarly debate, with some questioning the extent of his involvement, particularly in light of the fact that he only publicly claimed authorship of the character following the passing of Sullivan, who had previously received the lion's share of credit for the character's creation.
However, the majority of prominent comics and animation historians, as well as veterans of the Sullivan studio, concur that Messmer's claims are valid, lending credence to his assertion of a more substantial creative role in the development and popularity of Felix.