Delving Into Minds of Ill Doctors (The Lakeland Ledger) At 8:30 a.m. on Sept. 11, 2001, Robert Klitzman's sister, Karen, called her best friend from her office on the 105th floor of the World Trade Center. No one ever heard from her again. Grief-stricken, Klitzman became depressed, but he didn't realize it for a while. He is a psychiatrist. He couldn't become mentally ill, could he' [News Source]