To answer the above question, the relevant sentence is: In Season 9, he quits his job and Monica helps him start a new career in advertising.
This justifies what answer for what question? Q & A:
Passage: Chandler works as an IT procurements manager with the specialization "Statistical analysis and data reconfiguration," but loathes it. In Season 9, he quits his job and Monica helps him start a new career in advertising.

Question: Based on this passage, what does chandler do after he quits his job?
a new career in advertising