who are lynne and david angell
David Angell was an executive producer and co-creator of Frasier along with Peter Casey and David Lee. He also worked on Cheers and Wings. Unfortunately he and his wife Lynne died in the attacks on the World Trade Center in September 2001, they were both passengers on a plane that hit one of the towers. I believe the first episode of Season 9 was dedicated to their memory.
I hope I have been of use and if you have any other Frasier related questions then feel free to ask.