Mechanical engineer Norman Kurtz died May 13 at his home in Scarsdale, New York. His firm, Flack & Kurtz, founded along with Peter Flack in 1969, is known for high-performance, environmentally responsible buildings. He directed many of the company�s most high-profile projects, including Petronas Towers in Kuala Lumpur, Malaysia, Canary Wharf in London and the currently under-construction Hearst Headquarters in New York City. Kurtz, 69, stepped down as president and CEO of the 350-person firm 2003, but had retained the post of chairman. The cause of death has not yet been made public.