Chloe Sladden is the latest executive over at Twitter to be affected by the massive reorganization of the company's corporate structure. Sladden, who served as head of Twitter's North American media operations, announced Thursday that she would be leaving, the San Francisco Chronicle reported. Her departure follows that of former chief operating officer, Ali Rowghani, who resigned earlier Thursday. Citing regulatory filings, the Chronicle reported that Rowghani won't be replaced, as other executives will split up his responsibilities, such as CEO Dick Costolo becoming more involved with the engineering and product teams. Urgent: Do You Approve Or Disapprove of President Obama's Job Performance? Vote Now in Urgent Poll Late last month, Senior VP of Engineering Christopher Fry also resigned and accepted an advisory position, according to a filing with the Securities and Exchange Commission.