My friend and long-term collaborator Tim Poston died recently, from strokes that may have been connected with treatment for bone cancer. For more than forty years we joined forces on two research-level mathematics textbooks, several papers, and two science fiction novels: The Living Labyrinth and Rock Star. We had just started working on a third.
For information about Tim, use the following links:
Obituary in The Guardian
Tim's Geometeer website
Tim's wikipedia entry
Review of The Living Labyrinth