Riding the Giganotosaur by Michael Swanwick (opens in new tab)

"Riding the Giganotosaur" is a 1999 science fiction short story by Michael Swanwick. It is about a man who has his brain grafted onto a dinosaur's, and then runs free and wild in the unspoiled Cretaceous period. Non-Spoiler Summary In A Nutshell: George is a wealthy retired businessman who blows his retirement account on the lifestyle he really wants - having his brain surgically implanted in a dinosaur! The story begins as George is recovering from the surgery and undergoing therapy as he le...