Frederik Pohl

The Last Theorem
THE LAST THEOREM grew from 100 pages of notes Arthur C. Clarke gave to Frederik Pohl. [...] With the help of Elizabeth Anne Hull, Pohl completed a story of mathematics, political intrigue, and a threat to the survival of Earth.

The Boy Who Would Live Forever
Latest novel in the Heechee series (New York: Tor, 2004).

The Other End of Time
"Pohl at the top of his form"
"Another mind-boggling saga."

Jem
A brilliant handling of the SF themes of first contact, planetary disaster, and future politics. 

Man Plus
The making of a cyborg, with added twists in the human/machine relationship.