The Reassembled Man
Kastle, Herbert D. The aliens were much better at their job than all the king's horses had been with Humpty Dumpty.
First, they simply disassembled Edward Berner-tissue by tissue, nerve by nerve. In tanks they stored the million remnants and shreds that had been Berner, and they changed his brain into a fantastic recording device.
Then they simply put him back together.
Sinew by sinew, cell by cell.
But it was not the same Ed Berner. The new Ed Berner was strong...