Conversation so far:
Where does Joi Ito work currently?
Joi Ito resigned from his roles on September 7, 2019, following allegations of financial ties to sex offender and financier Jeffrey Epstein.
Where did Joi Ito start his career?
Joi Ito became a disc jockey working in nightclubs in Chicago such as the Limelight and Smart Bar.
Did Joi Ito have any other non tech-jobs besides his job as a DJ?
Joi Ito ran a nightclub in Roppongi, Japan, called XY Relax

Question: What area did he end up specializing in?
Self-contained rewrite: What area did Joi Ito end up specializing in?