Professor Yana was a human identity the "War" Master created for himself when using a Chameleon Arch to escape the Last Great Time War. Professor Yana was a kindly old man who inherited the Master's intellect, but none of his cruelty. He was a resourceful and inventive man, but he had lost hope in the Utopia Project until he met the Tenth Doctor, who considered him a genius, and the two mutually admired one another. He was also somewhat scatterbrained and slightly lacking in self-confidence.