Conversation so far:
When did Barclay start Paris Barclay's music video career?
Following his graduation from Harvard, he worked as a copywriter and creative supervisor.
How well did his music video career do initially?
Most notably, he created eight videos for LL Cool J.

Question: Who else did he create videos for?
Self-contained rewrite: Who else did Paris Barclay create videos for besides LL Cool J?