Segar is a cartoonist, creator of Charlie Chaplin's Comic Capers, Barry the Boob, Looping the Loop, Thimble Theatre, and The Five-Fifteen (which later became Sappo. Apparently, he liked alliterative titles. He's also the creator of Popeye, so odds are that's all anyone would know or remember about him.
OK, that's pretty cool.
I'm gonna go out on a limb and guess that Popeye kinda stole the spotlight of Thimble Theater.