Who is Jim Keene from Watchers and what is their importance?

Jim Keene is a veterinarian. Travis and Nora visit Keene when Einstein gets sick, Keene, however, has been sent a notice every week since Einstein's disappearance tellong him Einstein is a research animal who holds the key to the cure for cancer. Keene later asks Nora and Travis about the notice, after which, they explain their situation. Einstein then proves his intelligence to Keene by answering questions using Scrabble tiles to write his answers. Keene is so impressed that he gives them his word that he will guard their secret if allowed to remain in Einstein's life. The group goes onto become good friends.