You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
American_Broadcasting_Company

Context:
In 1998, the network began using a minimalist graphical identity, designed by Pittard Sullivan, featuring a small black-and-white "ABC Circle" logo on a yellow background (promotions during this time also featured a sequence of still photos of the stars of its programs during the timeslot card as well as the schedule sequence that began each night's prime time lineup). A new four-note theme tune was introduced alongside the package, based around the network's "We Love TV" image campaign introduced that year, creating an audio signature on par with the NBC chimes, CBS' various three-note soundmarks (including the current version used since 2000) and the Fox Fanfare. The four-note signature has been updated with every television season thereafter (though variants of it used since the 1998–99 season remain in use during the production company vanity cards shown following the closing credits of most programs). In the fall of 2015, ABC is stopped with its 1998–2002 four-note jingles for promotions and production company vanity cards following the closing credits of most of its programs over seventeen years, now it have a different and adventure-type music (with the drums of the network's four-note signature in the ending). The old four-note theme tune is still used by ABC on Demand to the beginning of the ABC show.

Question:
Who designed ABC's 1998 new graphic design?

Pittard Sullivan