Chandler Bing is portrayed by actor Matthew Perry. The character is known for his sarcastic and witty humor, often using it as a defense mechanism to cover up his insecurities. He works in statistical analysis and data reconfiguration for a large, multi-national corporation, a job which he dislikes but is good at. Throughout the series, his job is a running gag, with the other characters often not understanding what he does for a living. Later in the series, Chandler leaves his job and becomes a junior copywriter at an advertising agency.