Jim Henson was an entertainer.
Jim Henson . After graduating from the University of Maryland with a degree in home economics , he produced coffee advertisements and developed some experimental films . Henson became famous in the 1960s when he joined the children 's educational television program Sesame Street , and there helped develop characters for the series . Rowlf the Dog is a Muppet character , a scruffy brown dog of indeterminate breed , though part Corgi , with a rounded black nose and long floppy ears .