Jef Raskin, a mathematician, orchestral soloist and composer, professor, bicycle racer, model airplane designer, and pioneer in the field of human-computer interactions, died peacefully on February 26th, 2005 surrounded by his family and loved ones. He had recently been diagnosed with pancreatic cancer. (Source)
A number of tributes have already sprung up, though I doubt there could ever be enough.
From one life long Mac fan, thank you Jef, your legacy will live on.
These random machinations are brought to you by the letters R, S and S.